Abstract

A Au-Ga alloy layer is synthesized on a Au sheet substrate at low temperature and a new nanoporous Au material is then prepared based on Ga removal from the Au-Ga alloy by a electrochemical method. X-ray diffraction analysis confirms that the grains of the newly formed Au layer are refined and scanning electron microscopy suggests that the newly formed Au layer has a nanoporous structure with a pore size of∼16 nm. The cyclic voltammetry curve of the prepared nanoporous Au in a 1 M KCl solution presents a square structure of a supercapacitor with a specific capacitance of mF·cm-2, which is 86 times that of the smooth Au electrode. The 4-mercaptobenzoic acid (4-MBA) modified nanoporous Au material is used as a Raman substrate to detect Hg2+ with surface-enhanced Raman scattering. from 1.0×10−10 mol·L-1 to 1.0×10−5 mol·L-1), and the limit of detection is 1.0×10−10 mol·L-1.

© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

1. Introduction

Hg is a liquid metal that has been widely used in thermometers, barometers and batteries. However, Hg is a human neurotoxin, and it can be bioaccumulated in water and soil environments. It may be transmitted through the food chain and cause serious adverse health effects to animals and humans. In order to study the impact of Hg in water and soil on living organisms, trace Hg detection technology remains an essential research topic that requires further development.

Common methods for the detection of Hg ions in water include atomic absorption spectrometry (AAS) [1,2], colorimetry [3,4], fluorescent probe [57], and electrochemical sensor methods [8,9] as well as surface enhanced Raman scattering (SERS) [1012].

Each method has its own characteristics, for example, SERS has the characteristics of high sensitivity, so it has been widely studied in chemical and environmental fields. Hg2+ ions cannot be directly detected by SERS because they lack vibrational signatures [13]. In order to detect Hg2+ with SERS, selective SERS probes have been used [1416], including 4-mercaptobenzoic acid (4-MBA)-modified active metal nanoparticle sol substrates. In these analyses, the SERS intensities of 4-MBA decreased with increasing Hg2+ concentration. The SERS effect of the sol substrate is good, but the disposable substrate of noble metal nanoparticles causes a waste of resources. Therefore, new SERS substrates need to be explored and used.

The sensitivity of SERS depends on localized surface plasmon resonance characteristics, which are determined by the size, morphology, and structure of the SERS substrate [7]. Nanoparticle film and nanoporous materials are effective substrates for SERS measurements [8,1012], and it is of great significance that nanoporous materials can be used as reusable SERS substrates [17,18]. As far as we know, these substrates have not been used for the SERS detection of Hg2+.

Nanoporous materials can be prepared using self-assembly [19], electrochemical oxidation [20], chemical reduction [21], electrodeposition [22], displacement reaction [23] and dealloying methods [24,25]. Among these methods, dealloying technology has the particularly important advantage of high efficiency.

Ga is a low melting point metal that is liquid at room temperature. When Ga is removed by chemical dealloying from varying alloys with Au, Pd and Pt formed at low temperature [26], the corresponding nanoporous materials can be prepared on the surface of the dense substrate [26].

The electrochemical corrosion is rapid with controllable voltage and current. Therefore, in this study, a low-temperature alloying method is used to synthesize a Ga-Au alloy and electrochemical dealloying is then used for the successful derivation of nanoporous Au. 4-MBA modified nanoporous Au (4-MBA/NpsAu) was used as a SERS substrate to detect Hg2+ in an ethanol solution.

2. Experimental

2.1 Materials

Ga metal (99.99%, Macklin), Au sheet (99.99%, 5 mm ×5 mm × 0.2 mm, Tianjin Yinhai Metal Products Co., Ltd.), 4-MBA (95%, Macklin), HgCl2 (99%, Aladdin) and ethanol (99.7%, Tianjin Bai Chemical Co. Ltd.).

2.2 Preparation of nanoporous Au

Smooth Au sheets were ultrasonically degreased in absolute ethanol for 10 min, followed by rinsing with deionized water and drying in an oven at 100 °C for 20 min. At ∼35 °C, the liquid Ga was evenly coated with a brush on the Au sheet [26] (the thickness of the Ga film was ∼100 µm). Heat treatment in an oven at 100 °C for 300 min was performed to obtain the Au-Ga alloy.

In a three-electrode system in a 1 M NaOH solution, with a smooth Au sheet as the working electrode, Pt wire as the auxiliary electrode and Hg/HgO as the reference electrode, an Epsilon electrochemical analyzer was used for cyclic voltammetry testing. Figure 1 shows the cyclic voltammetry curve of smooth Au sheets in a 1 M NaOH solution. When the electrode potential was between -0.6 and 0.2 V (vs. Hg/HgO) in anodic process, no oxidation reaction on the Au electrode was observed, suggesting that the electrode was electrochemically stable. When the electrode potential was greater than -1.0 V, Ga could be electrochemically oxidized and dissolved in the 1 M NaOH solution [27]. Therefore, in this study 0.12 V(vs Hg/HgO) was used as the specific electrode potential for Ga dealloying.

 figure: Fig. 1.

Fig. 1. Cyclic voltammetry curve of smooth Au electrodes in 1 M NaOH solution.

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The Ga in the alloy was removed by constant potential electrolysis at 0.12 V(vs Hg/HgO) until the electrolysis current was less than 2 µA. The surface of the electrode was then rinsed with deionized water and dried in an oven at 100 °C for 20 min before use.

2.3 X-ray diffraction and scanning electron microscopy analysis

The phase composition was determined by X-ray diffraction (XRD) performed using an X-ray powder diffractometer (D/Max-3c, Rigaku, Japan) operated at 40 kV and 40 mA with a Cu-Kα radiation (λ = 1.5406 Å) source. Diffraction angles for 2θ ranging from 20 to 85 ° (scanning speed: 5°·min−1) were taken to determine the crystalline phase. A field-emission scanning electron microscope (SEM; Quanta 200, FEI, Netherlands) and energy-dispersive X-ray spectroscopy (EDX) were used to characterize the microstructure and composition of the material at 20–30 kV.

2.4 Electrochemical performance of nanoporous Au

In 1 M KCl, a three-electrode system was used with the nanoporous Au electrode as the working electrode, Pt wire as the auxiliary electrode and a saturated calomel electrode as the reference electrode. The cyclic voltammetry test was performed in the range of -0.3 to +0.5 V (vs SCE) with a scanning speed of 10 mV/s.

2.5 SERS characteristics

Chemical modification of nanoporous Au material [28,29]: At room temperature, the prepared nanoporous Au sheet was placed in a 0.1 M 4-MBA/ethanol solution for adsorption for 3 h to form the 4-MBA/NpsAu. The nanoporous Au sheet was then rinsed with deionized water.

Detection of Hg2+ SERS: The SERS characteristics were determined by means of Raman spectroscopy (Renishaw inVia) using a spectrometer equipped with a multi-channel charge-coupled device detector and a confocal microscope (DM2500M, Leica). The intensity of the 785 nm laser was 1 mW and the integration time of the SERS spectra was and 30 s. The corresponding SERS spectra were then recorded with a 50 × objective. Prior to the measurements, 10 µL of the Hg2+ solution (HgCl2 ethanol solution) was dropped on the 4-MBA/NpsAu substrate, and the ethanol was naturally evaporated in the air after 15 min. To reduce the error caused by changes in the substrate position, the 4-MBA/NpsAu was immobilized. Afterward, the objective lens was removed, 10 µL of the subsequent Hg2+ concentration solution was dropped on the substrate, the lens was moved back to the original position, and the SERS spectrum associated with the concentration was then recorded [30].

3. Results and analysis

3.1 XRD analysis of phase structure

The phase structures of the Au-Ga alloy before and after the electrochemical Ga dealloying were scanned and determined by XRD.

Figure 2 shows the XRD patterns of the smooth Au sheets, Au-Ga alloys and synthetic Au materials. The results in Fig. 2(a) show that five diffraction peaks were observed in the XRD pattern of the smooth Au sheets at diffraction angles 2θ of 38.10°, 44.37°,64.60°, 77.59° and 81.73°, representing the (111), (200), (220), (311) and (222) diffraction surfaces of Au respectively (PDF No. 04-0784).

 figure: Fig. 2.

Fig. 2. XRD analysis of (a) smooth Au sheet, (b) Au-Ga alloy and (c) Au-Ga alloy after Ga dealloying treatment

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Figure 2(b) presents an XRD pattern of a sample prepared by coating a Ga film on an Au sheet after heat-treating it at 100 °C for 300 min. The results showed that the characteristic diffraction peaks of Au disappeared, but five new peaks were observed at 2θ of 25.27°, 41.59°, 49.59°, 60.76° and 66.96°. These new peaks were attributed to the the (111), (220), (311), (400) and (331) diffraction planes of AuGa2, respectively (PDF No. 03-0969). This suggested that when the Ga film on the Au sheet was heat-treated at 100 °C, the Au surface was completely transformed into a Au-Ga alloy layer. This was slightly different from previous reports: In addition to the Au-Ga phase structure observed by Wang et al. [26], they still observed the original Au phase structure coated with the Ga film on an Au sheet heat-treated at 100 °C. This is likely due to the Ga and AuGa2 layers coated by Wang et al. being thinner, meaning they could be penetrated by X-rays to detect the phase structure of the Au substrate.

As shown in Fig. 2(c), the five typical peaks of AuGa2 disappeared after the dealloying of Ga, whereas the five XRD typical diffraction peaks of Au that once disappeared were observed, indicating that the Ga in AuGa2 was electrochemically removed and a new Au layer was formed. According to the Scherrer equation, the grain size of the newly formed Au material was ∼20 nm, smaller than the 30 nm of the Au substrate, indicating that the grain size of the newly formed Au layer has been refined. This suggested that the use of electrochemical methods can completely remove Ga out of AuGa2 alloy layer and that a new Au layer was formed during the Ga removal process. The grain refinement during the regeneration of the new Au layer led to a broader XRD diffraction peak.

3.2 SEM analysis of nanoporous Au

As shown in Fig. 3(a), the surface of the newly formed Au layer was arranged to form a net-like nanoporous structure (pore size of 16 nm) different from the nanoporous structure obtained by chemical etching. The nanoporous Au sheet was accumulated by small Au particles when the chemical etching method was used to remove Ga from the AuGa2 alloy [26], while a flat and uniform nanoporous Au with a thickness of ∼30 µm was obtained when the electrochemical method was used (Fig. 3(b)).

The EDX spectrum of the nanoporous Au is shown in Fig. 3(c). Except for C and N, which can be considered as contaminated elements, Ga was not detected, indicating that the content of Ga in the material after electrochemical dealloying was removed.

 figure: Fig. 3.

Fig. 3. SEM images of (a) a nanoporous Au surface, (b) a cross section of a nanoporous Au sheet and (c) EDX spectrum of a nanoporous Au sheet.

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3.3 Electrochemical properties of nanoporous Au

In order to study the electrochemical activity of the electrodes, the cyclic voltammetry of the smooth Au sheet and the prepared nanoporous Au sheet and the prepared nanoporous Au sheet were measured at a scan rate of 10 mv/s, with the electrode potential in the range of -0.3–0.5 V. The electrochemical test was carried out in a traditional three-electrode electrochemical cell using a 1 M KCl solution as the electrolyte (Fig. 4). As shown in Fig. 4(a), the cathode and anode current densities of the smooth Au electrode were both small because the specific surface area of the smooth Au sheet was significantly small. This suggested that the activity of the smooth Au electrode in the 1 M KCl solution was very low.

 figure: Fig. 4.

Fig. 4. Cyclic voltammetry curves (in 1 M KCl) of a) smooth Au electrode, b) nanoporous Au electrode.

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The cyclic voltammetry curve of the prepared nanoporous Au electrode suggested that the nanoporous Au electrode formed an electric double-layer region (Faraday current) and paired redox peaks. This was likely attributable to the widespread reaction hot spots on the rough surface of the nanoporous Au sheet [31]. The crystal structure of the Au nanoparticles can form a single layer of Au hydrated oxide under a lower positive potential scan, which was reduced to nano Au particles under a negative potential scan, thereby forming a pair of redox peaks [32]. Due to the sharp increase in the specific surface area of the nanoporous Au electrode, the current density of the cathode and anode in the cyclic voltammetry curve increased accordingly, presenting a better square shape of the cyclic voltammetry curve with the typical characteristics of a supercapacitor [29,31] (Fig. 4(b)). The area capacitance was 187 mF·cm-2, and it was 86 times that of the smooth Au electrode, which indicated that the synthesized nanoporous Au exhibited higher electrochemical activity than the polished Au.

3.4 SERS of trace Hg2+ on a 4-MBA/NpsAu

Figure 5(A) shows the SERS spectra of Hg2+ adsorbed on a solid substrate of 4- MBA/NpsAu at different Hg2+ concentrations. Figure 5(A) (a) reveals two characteristic Raman peaks at 1083 and 1598 cm-1 for 4-MBA absorbed on the nanoporous Au substrate in the absence of Hg2+, which are attributed to the two distinct ring breathing vibrational modes [16]. The intensity of the 4-MBA characteristic Raman peaks decreases while the 4-MBA/NpsAu Raman substrate is treated in presence of Hg2+, which are attributed to the partition layer formed to draw the 4-MBA away from the Au nanoparticles surface in the presence of Hg2+ [16,33]. The thickness of the partition layer increases with increasing concentration of Hg2+ and the intensity of the 4-MBA characteristic Raman peaks continually decreases.

 figure: Fig. 5.

Fig. 5. (A) SERS spectra of 4-MBA/NpsAu at different Hg2+ concentrations and their enlarged parts (inset): (a) 0 mol·L-1, (b)1.0×10−10 mol·L-1, (c)1.0×10−9 mol·L-1, (d) 1.0×10−8 mol·L-1, (e) 1.0×10−7 mol·L-1, (f)1.0×10−6 mol·L-1, (g) 1.0×10−5 mol·L-1; (B)Dependence of the SERS intensity on the Hg2+ concentration at: (a)1083 cm−1 and (b)1598 cm-1.

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Figure 5(B) shows the relationship between the concentration (from 1.0×10−10 to 1.0×10−5 mol·L-1) of Hg2+ and the intensity of the 4-MBA characteristic Raman peaks. As shown in the figure, the intensity of the Raman peak was linearly dependent on the logarithm of the Hg2+ concentration ranging from 1.0×10−10 mol·L-1 to 1.0×10−5 mol·L-1(estimated linear correlation coefficient R value: (a) 0.95 at 1083 cm−1 and (b) 0.99 at 1598 cm-1). The SERS detection sensitivity of Hg2+ on the 4-MBA/NpsAu was 1.0×10−10 mol·L-1, which was similar to that of the 4-MBA modified Au nanoparticles [16]. This study provides some research basis for reusable Raman substrates.

4. Conclusions

This study developed a SERS substrate based on a 4-MBA/NpsAu layer, and achieved the sensitive detection of Hg2+ in ethanol solutions: A nanoporous Au layer has been prepared on a Au substrate by electrochemically removing the Ga out of the pre-synthesized Au-Ga alloy. A layer of 4-MBA was assembled on the surface of nanoporous Au as a SERS probe for Hg2+ detection. And the SERS intensity of the 4-MBA characteristic Raman peaks decreased with the increase of Hg2+ concentration when the 4-MBA/NpsAu was used as a SERS substrate to detect Hg2+.The SERS intensity of which decreased linearly with the logarithm of Hg2+ concentration in the range from 1.0×10−10 to 1.0×10−5 mol·L-1. The 4-MBA/NpsAu showed high SERS sensitivity for Hg2+ and might serve as a reusable Raman substrate.

Funding

Natural Science Foundation of Guangxi Province (2018GXNSFAA138178); Major Science and Technology Projects in Guangxi (AA17204067, AA18118044); Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, China; National Natural Science Foundation of China (NSFC) (21861004, 31360158).

Disclosures

The authors declare that there are no conflicts of interest related to this article.

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

References

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5. Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019). [CrossRef]  

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10. Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020). [CrossRef]  

11. Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020). [CrossRef]  

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16. Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018). [CrossRef]  

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References

  • View by:

  1. S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
    [Crossref]
  2. N. Safari, K. Ghanemi, and F. Buazar, “Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples,” J. Environ. Manage. 276, 111263 (2020).
    [Crossref]
  3. S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
    [Crossref]
  4. Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
    [Crossref]
  5. Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
    [Crossref]
  6. Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
    [Crossref]
  7. T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
    [Crossref]
  8. J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
    [Crossref]
  9. Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
    [Crossref]
  10. Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
    [Crossref]
  11. Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
    [Crossref]
  12. Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
    [Crossref]
  13. L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
    [Crossref]
  14. J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
    [Crossref]
  15. Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
    [Crossref]
  16. Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
    [Crossref]
  17. Y. Jiao, M. Chen, Y. Ren, and H. Ma, “Synthesis of three-dimensional honeycomb-like Au nanoporous films by laser induced modification and its application for surface enhanced Raman spectroscopy,” Opt. Mater. Express 7(5), 1557–1564 (2017).
    [Crossref]
  18. S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
    [Crossref]
  19. Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
    [Crossref]
  20. S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
    [Crossref]
  21. N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
    [Crossref]
  22. J. Bi, “Electrodeposited silver nanoflowers as sensitive surface-enhanced Raman scattering sensing substrates,” Mater. Lett. 236, 398–402 (2019).
    [Crossref]
  23. K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
    [Crossref]
  24. R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
    [Crossref]
  25. L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
    [Crossref]
  26. Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
    [Crossref]
  27. Z. Jiang, S. Huang, and B. Qian, “Semiconductor properties of Ag2O film formed on the silver electrode in 1 M NaOH solution,” Electrochim. Acta 39(16), 2465–2470 (1994).
    [Crossref]
  28. M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
    [Crossref]
  29. S. M. Rosendahl and I. J. Burgess, “Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces,” Electrochim. Acta 53(23), 6759–6767 (2008).
    [Crossref]
  30. Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
    [Crossref]
  31. X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
    [Crossref]
  32. B. T. P. Quynh, J. Y. Byun, and S. H. Kim, “Electrochemical behavior of aromatic compounds on nanoporous gold electrode,” J. Electrochem. Soc. 165(10), B414–B421 (2018).
    [Crossref]
  33. Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
    [Crossref]

2021 (2)

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

2020 (9)

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

N. Safari, K. Ghanemi, and F. Buazar, “Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples,” J. Environ. Manage. 276, 111263 (2020).
[Crossref]

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

2019 (3)

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

J. Bi, “Electrodeposited silver nanoflowers as sensitive surface-enhanced Raman scattering sensing substrates,” Mater. Lett. 236, 398–402 (2019).
[Crossref]

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

2018 (7)

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

B. T. P. Quynh, J. Y. Byun, and S. H. Kim, “Electrochemical behavior of aromatic compounds on nanoporous gold electrode,” J. Electrochem. Soc. 165(10), B414–B421 (2018).
[Crossref]

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

2017 (3)

Y. Jiao, M. Chen, Y. Ren, and H. Ma, “Synthesis of three-dimensional honeycomb-like Au nanoporous films by laser induced modification and its application for surface enhanced Raman spectroscopy,” Opt. Mater. Express 7(5), 1557–1564 (2017).
[Crossref]

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

2016 (1)

L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
[Crossref]

2015 (1)

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

2013 (1)

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

2011 (1)

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

2010 (1)

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

2008 (1)

S. M. Rosendahl and I. J. Burgess, “Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces,” Electrochim. Acta 53(23), 6759–6767 (2008).
[Crossref]

2007 (1)

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

2006 (1)

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

1994 (1)

Z. Jiang, S. Huang, and B. Qian, “Semiconductor properties of Ag2O film formed on the silver electrode in 1 M NaOH solution,” Electrochim. Acta 39(16), 2465–2470 (1994).
[Crossref]

Agyekum, A. A.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Almeida, C.

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

Al-Rashed, S.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Annavaram, V.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Bai, S.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Balasurya, S.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Barimah, A. O.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Benoliel, M.

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

Bi, J.

J. Bi, “Electrodeposited silver nanoflowers as sensitive surface-enhanced Raman scattering sensing substrates,” Mater. Lett. 236, 398–402 (2019).
[Crossref]

Biener, J.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

Buazar, F.

N. Safari, K. Ghanemi, and F. Buazar, “Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples,” J. Environ. Manage. 276, 111263 (2020).
[Crossref]

Burgess, I. J.

S. M. Rosendahl and I. J. Burgess, “Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces,” Electrochim. Acta 53(23), 6759–6767 (2008).
[Crossref]

Byun, J. Y.

B. T. P. Quynh, J. Y. Byun, and S. H. Kim, “Electrochemical behavior of aromatic compounds on nanoporous gold electrode,” J. Electrochem. Soc. 165(10), B414–B421 (2018).
[Crossref]

Cai, W.

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Chang, H.

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Chen, B.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Chen, C.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Chen, J. L.

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Chen, L.

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Chen, M.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Y. Jiao, M. Chen, Y. Ren, and H. Ma, “Synthesis of three-dimensional honeycomb-like Au nanoporous films by laser induced modification and its application for surface enhanced Raman spectroscopy,” Opt. Mater. Express 7(5), 1557–1564 (2017).
[Crossref]

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Chen, M. W.

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

Chen, Q.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Chen, X.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Dai, J.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Das, A.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Deng, D.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Ding, H.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Dou, X.

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

Du, Y.

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Ekgasit, S.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Elgorban, A.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

El-seedi, H. R.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Fan, C.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Fletcher, S.

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

Fu, H.

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Fu, Z. C.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Gao, H.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Gao, M.

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Gao, X.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Gatemala, H.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Ghanemi, K.

N. Safari, K. Ghanemi, and F. Buazar, “Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples,” J. Environ. Manage. 276, 111263 (2020).
[Crossref]

Gu, R. A.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Guo, C.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Guo, Z.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

Hamza, A. V.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

Han, L.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Han, X.

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Hayes, J. R.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

He, H.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Hirata, A.

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Hu, A.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Huang, S.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Z. Jiang, S. Huang, and B. Qian, “Semiconductor properties of Ag2O film formed on the silver electrode in 1 M NaOH solution,” Electrochim. Acta 39(16), 2465–2470 (1994).
[Crossref]

Huo, D.

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Huser, T.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

Iwasa, Y.

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

Jiang, D.

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Jiang, T.

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

Jiang, Z.

Z. Jiang, S. Huang, and B. Qian, “Semiconductor properties of Ag2O film formed on the silver electrode in 1 M NaOH solution,” Electrochim. Acta 39(16), 2465–2470 (1994).
[Crossref]

Jiao, Y.

Jin, L.

L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
[Crossref]

Kang, C.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Kang, Y.

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Ke, Y.

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Khan, S.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Kim, S. H.

B. T. P. Quynh, J. Y. Byun, and S. H. Kim, “Electrochemical behavior of aromatic compounds on nanoporous gold electrode,” J. Electrochem. Soc. 165(10), B414–B421 (2018).
[Crossref]

Kong, X.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Kucheyev, S. O.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

Lang, X. Y.

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

Li, C.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Li, F.

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

Li, J.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Li, J. J.

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Li, L.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Li, M.

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

Li, W.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Li, X.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Liao, C.

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Lin, Y. W.

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Ling, L.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Liu, G.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Liu, S.

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

Luo, L.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Ma, H.

Marraiki, N.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Meng, G.

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Meng, M.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Miranda, A.

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

Mu, L.

L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
[Crossref]

Ni, Y.

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

Niu, J.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Ozaki, Y.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Paiva, J.

S. Fletcher, A. Miranda, J. Paiva, M. Benoliel, and C. Almeida, “Optimization and in-house validation of the TDA-AAS method for mercury control in water and wastewater treatment plant sludges,” Anal. Methods 12(45), 5503–5513 (2020).
[Crossref]

Pan, D.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Peng, Z.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Pu, S.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Qi, Y.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Qian, B.

Z. Jiang, S. Huang, and B. Qian, “Semiconductor properties of Ag2O film formed on the silver electrode in 1 M NaOH solution,” Electrochim. Acta 39(16), 2465–2470 (1994).
[Crossref]

Quynh, B. T. P.

B. T. P. Quynh, J. Y. Byun, and S. H. Kim, “Electrochemical behavior of aromatic compounds on nanoporous gold electrode,” J. Electrochem. Soc. 165(10), B414–B421 (2018).
[Crossref]

Raju, L.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Ren, Y.

Rosendahl, S. M.

S. M. Rosendahl and I. J. Burgess, “Electrochemical and infrared spectroscopy studies of 4-mercaptobenzoic acid SAMs on gold surfaces,” Electrochim. Acta 53(23), 6759–6767 (2008).
[Crossref]

Safari, N.

N. Safari, K. Ghanemi, and F. Buazar, “Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples,” J. Environ. Manage. 276, 111263 (2020).
[Crossref]

She, G.

L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
[Crossref]

Shi, W.

L. Jin, G. She, L. Mu, and W. Shi, “Highly uniform indicator-mediated SERS sensor platform for the detection of Zn2+,” RSC Adv. 6(20), 16555–16560 (2016).
[Crossref]

Song, J.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Song, R.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Sun, L.

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Sun, Y. F.

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Syed, A.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Talley, C. E.

S. O. Kucheyev, J. R. Hayes, J. Biener, T. Huser, C. E. Talley, and A. V. Hamza, “Surface-enhanced Raman scattering on nanoporous Au,” Appl. Phys. Lett. 89(5), 053102 (2006).
[Crossref]

Tanabe, I.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Thammacharoen, C.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Thomas, A. M.

S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
[Crossref]

Tu, Y.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Vantasin, S.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Wang, M.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Wang, T.

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

Wang, X.

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Wang, X. Y.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Wang, Y.

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Wang, Z.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Wei, Y.

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Weng, G.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Wongravee, K.

K. Wongravee, H. Gatemala, C. Thammacharoen, S. Ekgasit, S. Vantasin, I. Tanabe, and Y. Ozaki, “Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy,” RSC Adv. 5(2), 1391–1397 (2015).
[Crossref]

Wu, H.

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Wu, T.

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Wu, X.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Wu, Y.

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

Wu, Z.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

Xie, F.

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Xue, Q. K.

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Xue, X.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Yamaguchi, Y.

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

Yan, X.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Yang, H.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Yang, M.

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Yang, P. C.

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Yao, J. L.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Yao, L.

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
[Crossref]

Yu, F.

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Yu, J.

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

Yu, Q.

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
[Crossref]

Yu, R.

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

Yuan, H. T.

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

Yuan, Y. X.

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

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R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Zhang, H.

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

Zhang, J.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
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Zhang, L.

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
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L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Zhang, T.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Zhang, X.

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Zhang, Z.

Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
[Crossref]

Zhao, J.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Zhao, J. W.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Zhao, Q.

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

Zhao, Y.

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

Zhou, M.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Zhou, N.

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

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N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Zhu, C.

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Zhu, F.

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

Zhu, J.

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

Zhu, Y.

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
[Crossref]

Zhu, Z.

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

Zou, X.

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

ACS Nano (1)

L. Zhang, H. Chang, A. Hirata, H. Wu, Q. K. Xue, and M. Chen, “Nanoporous gold based optical sensor for Sub-ppt detection of mercury ions,” ACS Nano 7(5), 4595–4600 (2013).
[Crossref]

Adv. Mater. Interfaces (1)

R. Song, L. Zhang, F. Zhu, W. Li, Z. C. Fu, B. Chen, M. Chen, H. Zeng, and D. Pan, “Hierarchical nanoporous copper fabricated by one-step dealloying toward ultrasensitive surface-enhanced Raman sensing,” Adv. Mater. Interfaces 5(16), 1800332 (2018).
[Crossref]

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Biosens. Bioelectron. (1)

Y. Wu, T. Jiang, Z. Wu, and R. Yu, “Novel ratiometric surface-enhanced raman spectroscopy aptasensor for sensitive and reproducible sensing of Hg2+,” Biosens. Bioelectron. 99, 646–652 (2018).
[Crossref]

Chem. Eng. J. (1)

Y. Wang, L. Zhang, X. Han, L. Zhang, X. Wang, and L. Chen, “Fluorescent probe for mercury ion imaging analysis: Strategies and applications,” Chem. Eng. J. 406, 127166 (2021).
[Crossref]

Electrochim. Acta (3)

J. Dai, L. Yao, X. Gao, S. Bai, X. Chen, L. Li, J. Song, and H. Yang, “To achieve ultrasensitive electrochemical detection of mercury ions employing metallic 1T-MoS2 nanosheets,” Electrochim. Acta 355, 136800 (2020).
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J. Anal. Test. (1)

M. Zhou, L. Han, H. He, D. Deng, L. Zhang, X. Yan, Z. Wu, Y. Zhu, and L. Luo, “Sensitive and selective determination of Cu2+ using self-assembly of 4-mercaptobenzoic acid on gold nanoparticles,” J. Anal. Test. 3(4), 306–312 (2019).
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J. Hazard. Mater. (1)

Q. Zhao, H. Zhang, H. Fu, Y. Wei, and W. Cai, “Raman reporter-assisted Au nanorod arrays SERS nanoprobe for ultrasensitive detection of mercuric ion (Hg2+) with superior anti-interference performances,” J. Hazard. Mater. 398, 122890 (2020).
[Crossref]

J. Mater. Chem. C (1)

Y. Qi, J. Zhao, G. Weng, J. Li, X. Li, J. Zhu, and J. W. Zhao, “A colorimetric/SERS dual-mode sensing method for the detection of mercury(II) based on rhodanine-stabilized gold nanobipyramids,” J. Mater. Chem. C 6(45), 12283–12293 (2018).
[Crossref]

J. Mater. Sci. (1)

S. Liu, J. Yu, T. Wang, and F. Li, “A multifunctional Ag/PAOCG reusable substrate for p-nitrophenol reduction and SERS applications,” J. Mater. Sci. 52(24), 13748–13763 (2017).
[Crossref]

J. Photochem. Photobiol., A (1)

Z. Zhu, H. Ding, Y. Wang, C. Fan, Y. Tu, G. Liu, and S. Pu, “A ratiometric and colorimetric fluorescent probe for the detection of mercury ion based on rhodamine and quinoline–benzothiazole conjugated dyad,” J. Photochem. Photobiol., A 400, 112657 (2020).
[Crossref]

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S. Balasurya, A. Syed, A. M. Thomas, N. Marraiki, S. Al-Rashed, A. Elgorban, L. Raju, A. Das, and S. Khan, “Colorimetric detection of mercury ions from environmental water sample by using 3-(Trimethoxysilyl)propyl methacrylate functionalized Ag NPs-tryptophan nanoconjugate,” J. Photochem. Photobiol., B 207, 111888 (2020).
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J. Raman Spectrosc. (2)

Y. X. Yuan, L. Ling, X. Y. Wang, M. Wang, R. A. Gu, and J. L. Yao, “Surface enhanced Raman spectroscopic readout on heavy metal ions based on surface self assembly,” J. Raman Spectrosc. 38(10), 1280–1287 (2007).
[Crossref]

Y. Kang, H. Zhang, L. Zhang, T. Wu, L. Sun, D. Jiang, and Y. Du, “In situ preparation of Ag nanoparticles by laser photoreduction as SERS substrate for determination of Hg2+,” J. Raman Spectrosc. 48(3), 399–404 (2017).
[Crossref]

J. Solid State Electrochem. (1)

Q. Yu, X. Kong, C. Chen, C. Kang, M. Meng, and S. Huang, “Synthesis of Ag NPs layer and its application as SERS substrate in the determination of p-phenylenediamine,” J. Solid State Electrochem. 25(2), 683–688 (2021).
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J. Bi, “Electrodeposited silver nanoflowers as sensitive surface-enhanced Raman scattering sensing substrates,” Mater. Lett. 236, 398–402 (2019).
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Z. Wang, Y. Wang, H. Gao, J. Niu, J. Zhang, Z. Peng, and Z. Zhang, “‘Painting’ nanostructured metals-playing with liquid metal,” Nanoscale Horiz. 3(4), 408–416 (2018).
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Opt. Mater. Express (1)

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Scr. Mater. (1)

X. Y. Lang, H. T. Yuan, Y. Iwasa, and M. W. Chen, “Three-dimensional nanoporous gold for electrochemical supercapacitors,” Scr. Mater. 64(9), 923–926 (2011).
[Crossref]

Sens. Actuators, B (3)

N. Zhou, G. Meng, C. Zhu, B. Chen, Q. Zhou, Y. Ke, and D. Huo, “A silver-grafted sponge as an effective surface-enhanced Raman scattering substrate,” Sens. Actuators, B 258, 56–63 (2018).
[Crossref]

Y. Wang, M. Gao, C. Liao, F. Yu, and L. Chen, “A sulfydryl-based near-infrared ratiometic fluorescent probe for assessment of acute/chronic mercury exposure via associated determination of superoxide anion and mercury ion in cells and in vivo,” Sens. Actuators, B 301, 127038 (2019).
[Crossref]

Y. F. Sun, J. J. Li, F. Xie, Y. Wei, and M. Yang, “Ruthenium-loaded cerium dioxide nanocomposites with rich oxygen vacancies promoted the highly sensitive electrochemical detection of Hg(II),” Sens. Actuators, B 320, 128355 (2020).
[Crossref]

Spectrochim. Acta, Part A (3)

Z. Guo, A. O. Barimah, C. Guo, A. A. Agyekum, V. Annavaram, H. R. El-seedi, X. Zou, and Q. Chen, “Chemometrics coupled 4-Aminothiophenol labelled Ag-Au alloy SERS off-signal nanosensor for quantitative detection of mercury in black tea,” Spectrochim. Acta, Part A 242, 118747 (2020).
[Crossref]

J. L. Chen, P. C. Yang, T. Wu, and Y. W. Lin, “Determination of mercury (II) ions based on silver-nanoparticles-assisted growth of gold nanostructures: UV–Vis and surface enhanced Raman scattering approaches,” Spectrochim. Acta, Part A 199, 301–307 (2018).
[Crossref]

Y. Zhao, Y. Yamaguchi, Y. Ni, M. Li, and X. Dou, “A SERS-based capillary sensor for the detection of mercury ions in environmental water,” Spectrochim. Acta, Part A 233, 118193 (2020).
[Crossref]

The Open Surface Science Journal (1)

T. Zhang, X. Zhang, X. Xue, X. Wu, C. Li, and A. Hu, “Plasmonic properties of welded metal nanoparticles,” The Open Surface Science Journal 3(1), 76–81 (2010).
[Crossref]

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (5)

Fig. 1.
Fig. 1. Cyclic voltammetry curve of smooth Au electrodes in 1 M NaOH solution.
Fig. 2.
Fig. 2. XRD analysis of (a) smooth Au sheet, (b) Au-Ga alloy and (c) Au-Ga alloy after Ga dealloying treatment
Fig. 3.
Fig. 3. SEM images of (a) a nanoporous Au surface, (b) a cross section of a nanoporous Au sheet and (c) EDX spectrum of a nanoporous Au sheet.
Fig. 4.
Fig. 4. Cyclic voltammetry curves (in 1 M KCl) of a) smooth Au electrode, b) nanoporous Au electrode.
Fig. 5.
Fig. 5. (A) SERS spectra of 4-MBA/NpsAu at different Hg2+ concentrations and their enlarged parts (inset): (a) 0 mol·L-1, (b)1.0×10−10 mol·L-1, (c)1.0×10−9 mol·L-1, (d) 1.0×10−8 mol·L-1, (e) 1.0×10−7 mol·L-1, (f)1.0×10−6 mol·L-1, (g) 1.0×10−5 mol·L-1; (B)Dependence of the SERS intensity on the Hg2+ concentration at: (a)1083 cm−1 and (b)1598 cm-1.

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