Abstract

The adsorption structure and binding of phenyl isocyanide (PNC), 2,6-dimethyl phenyl isocyanide (DMPNC), and benzyl isocyanide (BZI) on gold nanoparticle surfaces have been studied by means of surface-enhanced Raman scattering (SERS). PNC, DMPNC, and BZI have been found to adsorb on gold assuming a standing geometry with respect to the surfaces. The presence of the <i>ν</i>(CH) band in the SERS spectra denotes a vertical orientation of the phenyl ring of PNC, DMPNC, and BZI on Au. The lack of a substantial red shift and significant band broadening of the ring breathing modes implied that a direct ring <i>π</i> orbital interaction with metal substrates should be quite low. For PNC, the band ascribed to the C-NC stretching vibration was found to almost disappear after adsorption on Au. On the other hand, the C-NC band remained quite strong for DMPNC after adsorption. This result suggests a rather bent angle of C-N≡C: for the nitrogen atom of the NC binding group on the surfaces, whereas a linear angle of C-N≡C: should be more favorable on gold surfaces due to an intramolecular steric hindrance of its two methyl groups. SERS of BZI on gold nanopaticles also supports a bent angle of :C≡N-CH₂ for its nitrogen atom, suggesting a preference of sp³ (or sp²) hybridization for the nitrogen atom.

Method of optical manipulation of gold nanoparticles for surface-enhanced Raman scattering in a microcavity

Kun Xin, Xiaofeng Shi, Yi Liu, Zimeng Zhang, Wenjie Jia, and Jun Ma
Opt. Express 28(6) 8734-8743 (2020)

Environmental modification of self-assembled plasmonic core-shell cluster (silica-gold nanoparticles) for surface enhanced Raman scattering (SERS)

Nadiah Ghazali and Mohd Rafie Johan
Opt. Mater. Express 6(6) 1935-1941 (2016)

Hybrid surface-enhanced Raman scattering substrate from gold nanoparticle and photonic crystal: Maneuverability and uniformity of Raman spectra

Cheng Yi Wu, Chia Chi Huang, Jia Sin Jhang, An Chi Liu, Chun-Chen Chiang, Ming-Lung Hsieh, Ping-Ji Huang, Le Dac Tuyen, Le Quoc Minh, Tzyy Schiuan Yang, Lai-Kwan Chau, Hung-Chih Kan, and Chia Chen Hsu
Opt. Express 17(24) 21522-21529 (2009)

Surface enhanced Raman scattering of gold nanoparticles aggregated by a gold-nanofilm-coated nanofiber

Chang Cheng, Juan Li, Hongxiang Lei, and Baojun Li
Photon. Res. 6(5) 357-362 (2018)

Doubly resonant surface-enhanced Raman scattering on gold nanorod decorated inverse opal photonic crystals

Le Dac Tuyen, An Chi Liu, Chia-Chi Huang, Pei-Cheng Tsai, Jian Hung Lin, Chin-Wei Wu, Lai-Kwan Chau, Tzyy Schiuan Yang, Le Quoc Minh, Hung-Chih Kan, and Chia Chen Hsu
Opt. Express 20(28) 29266-29275 (2012)