High-performance surface-enhanced Raman scattering substrate prepared by self-assembling of silver nanoparticles into the nanogaps of silver nanoislands

Jiamin Quan; Yong Zhu; Jie Zhang; Junyin Li; Ning Wang

doi:10.1364/AO.56.005751

Applied Optics
Vol. 56,
Issue 20,
pp. 5751-5760
(2017)
•https://doi.org/10.1364/AO.56.005751

High-performance surface-enhanced Raman scattering substrate prepared by self-assembling of silver nanoparticles into the nanogaps of silver nanoislands

Jiamin Quan, Yong Zhu, Jie Zhang, Junyin Li, and Ning Wang

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Jiamin Quan, Yong Zhu, Jie Zhang, Junyin Li, and Ning Wang, "High-performance surface-enhanced Raman scattering substrate prepared by self-assembling of silver nanoparticles into the nanogaps of silver nanoislands," Appl. Opt. 56, 5751-5760 (2017)

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- Optics at Surfaces
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About this Article
History
- Original Manuscript: April 19, 2017
- Revised Manuscript: June 13, 2017
- Manuscript Accepted: June 15, 2017
- Published: July 10, 2017

Abstract

We report an effective and simple method to further enhance the surface-enhanced Raman scattering (SERS) by silver (Ag) nanoparticles (AgNPs) self-assembling into the nanogaps of an Ag nanoisland (AgNIs). The AgNIs prepared by dewetting of Ag film created a nanorough surface, which induced the Ag nanoparticles to regularly deposit into the nanogaps. AgNPs and AgNIs samples were also prepared for comparative analysis. Their SERS activities were investigated theoretically and experimentally. Experimental enhancement factors (EFs) for AgNPs, AgNIs, and AgNPs decorated AgNIs substrate (AgNPs-AgNIs) were $\sim 10^{7}$ , $\sim 10^{6}$ , $\sim 10^{8}$ , respectively, with relative standard deviation (RSD) of 66.1%, 12.9%, and 13.2%. Remarkable enhancement ( $EF \approx 10^{8}$ ) and excellent reproducibility ( $RSD = 13.2 %$ ) indicated the AgNPs-AgNIs had a high potential in practical application. Electromagnetic simulation using COMSOL Multiphysics demonstrated that the additional enhancement of the SERS effect could be mainly attributed to the improvement of the local electromagnetic field. Moreover, the deposition process of Ag nanoparticles was analyzed in detail to understand the reproducibility of AgNPs-AgNIs.

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	Raman Peak ( ${cm}^{- 1}$ )	614	773	1363	1509
${SiO}_{2} / Si$	$I_{RS}$ (counts)	128	82	135	124
AgNPs	$I_{SERS}$ (counts)	8831	3632	8490	7598
AgNPs	EF	$6.9 \times 10^{7}$	$4.4 \times 10^{7}$	$6.3 \times 10^{7}$	$6.1 \times 10^{7}$
AgNIs	$I_{SERS}$ (counts)	201	81	193	184
AgNIs	EF	$1.5 \times 10^{6}$	$9.9 \times 10^{5}$	$1.4 \times 10^{6}$	$1.5 \times 10^{6}$
AgNPs-AgNIs	$I_{SERS}$ (counts)	17186	6709	15734	14904
AgNPs-AgNIs	EF	$1.3 \times 10^{8}$	$8.2 \times 10^{7}$	$1.2 \times 10^{8}$	$1.2 \times 10^{8}$

	Shen et al. [33]	Zhang et al. [34]	Gong et al. [14]	Wang et al. [39]	Zhang et al. [12]
EF	$10^{6}$	$10^{6}$	$10^{7}$	$10^{7}$	$10^{7}$
RSD	11%	15%	11.6%	$< 20 %$	$< 20 %$

	Raman Peak ( ${cm}^{- 1}$ )	614	773	1363	1509
${SiO}_{2} / Si$	$I_{RS}$ (counts)	128	82	135	124
AgNPs	$I_{SERS}$ (counts)	8831	3632	8490	7598
AgNPs	EF	$6.9 \times 10^{7}$	$4.4 \times 10^{7}$	$6.3 \times 10^{7}$	$6.1 \times 10^{7}$
AgNIs	$I_{SERS}$ (counts)	201	81	193	184
AgNIs	EF	$1.5 \times 10^{6}$	$9.9 \times 10^{5}$	$1.4 \times 10^{6}$	$1.5 \times 10^{6}$
AgNPs-AgNIs	$I_{SERS}$ (counts)	17186	6709	15734	14904
AgNPs-AgNIs	EF	$1.3 \times 10^{8}$	$8.2 \times 10^{7}$	$1.2 \times 10^{8}$	$1.2 \times 10^{8}$

	Shen et al. [33]	Zhang et al. [34]	Gong et al. [14]	Wang et al. [39]	Zhang et al. [12]
EF	$10^{6}$	$10^{6}$	$10^{7}$	$10^{7}$	$10^{7}$
RSD	11%	15%	11.6%	$< 20 %$	$< 20 %$

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Applied Optics