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Ag Nanoparticle-Mediated Raman Scattering of 4-Aminobenzenethiol on a Pt Substrate

Raman scattering measurements were conducted for 4-aminobenzenethiol (4-ABT) monolayers assembled on a macroscopically smooth Pt substrate. At the beginning, no Raman peak was detected for 4-ABT on Pt, but upon attaching Ag nanoparticles to the amine groups of 4-ABT on Pt (Ag@4-ABT/Pt), distinct Raman spectra were observed. Considering the fact that almost no Raman peaks are observed when Ag nanoparticles are attached to 4-aminophenylsilane monolayers assembled on a silicon wafer, the Raman spectra observed for Ag@4-ABT/Pt must be surface-enhanced Raman scattering (SERS) spectra, occurring through an electromagnetic (EM) coupling of the localized surface plasmon of Ag nanoparticles with the surface plasmon polariton of the Pt substrate. From the excitation wavelength dependence, we also confirmed the contribution of the charge-transfer enhancement in the SERS spectra of Ag@4-ABT/Pt: it became more important at short-wavelength excitation. Overall, the SERS intensity of Ag@4-ABT/Pt gradually decreased as t...

Authors:   Kwan Kim; Hyang Bong Lee; Jae Keun Yoon; Dongha Shin; Kuan Soo Shin
Journal:   Journal of Physical Chemistry C
Year:   2010
DOI:   10.1021/jp105005a
Publication date:   12-Aug-2010
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