W. R. Thompson, J. Pemberton
Oct 1, 1994
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Journal
Analytical Chemistry
Abstract
Results are presented which demonstrate the use of Raman spectroscopy for the characterization of alkylsilane layers covalently bound to silica surfaces. Raman spectra of molecular assemblies of octadecylsilane have been studied by use of a thin silica gel/Ag sandwich structure as the substrate. The Ag surface, used to provide electromagnetic enhancement to the octadecylsilane overlayer, is modified with a monolayer of (3-mercaptopropyl)trimethoxysilane, which is used as a molecular adhesive for anchoring the thin silica gel film. Spin coating a silica sol on the modified Ag surface results in the formation of a thin silica gel layer which contributes minimal fluorescence background to the Raman spectra