Characterization of SiO2-Overcoated Silver-Island Films as Substrates for Surface-Enhanced Raman Scattering

Vapor deposition of a 45-Å layer of silver and a subsequent 50−65-Å layer of SiO2 onto a glass slide is shown to be a viable substrate for surface-enhanced Raman spectroscopy (SERS) and a model of the silica surface suitable for adsorption kinetic studies. The chemistry of the silica is characterize...

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Published in:Analytical chemistry (Washington) 1996-03, Vol.68 (6), p.1003-1011
Main Authors: Lacy, William B, Williams, John M, Wenzler, Lisa A, Beebe, Thomas P, Harris, Joel M
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Scientific imaging
Silver
Solid-liquid interface
Surface physical chemistry
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container_issue 6
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container_title Analytical chemistry (Washington)
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creator Lacy, William B
Williams, John M
Wenzler, Lisa A
Beebe, Thomas P
Harris, Joel M
description Vapor deposition of a 45-Å layer of silver and a subsequent 50−65-Å layer of SiO2 onto a glass slide is shown to be a viable substrate for surface-enhanced Raman spectroscopy (SERS) and a model of the silica surface suitable for adsorption kinetic studies. The chemistry of the silica is characterized by UV absorption and contact angle measurements. The physical structure is probed by atomic force microscopy to compare the surface roughness of the silver-island film and its SiO2 overcoat. Auger electron spectroscopy and X-ray photoelectron spectroscopy are used to probe the silica layer for exposure of silver through gaps in the overcoat. Comparison of SERS of dibenzyl disulfide bound to a silver-island film versus that of a silver film protected by the SiO2 overlayer tests the continuity of the SiO2 film and its ability to block access of adsorbates to the underlying silver surface. The model silica surface is used to detect the Raman spectrum of adsorbed pyridine and its adsorption isotherm; the adsorbate vibrational frequencies are consistent with previous reports of pyridine on silica.
doi_str_mv 10.1021/ac950860b
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Chemistry
Exact sciences and technology
General and physical chemistry
Scientific imaging
Silver
Solid-liquid interface
Surface physical chemistry
title Characterization of SiO2-Overcoated Silver-Island Films as Substrates for Surface-Enhanced Raman Scattering
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