Characterization of Silane-Modified Immobilized Gold Colloids as a Substrate for Surface-Enhanced Raman Spectroscopy

Olson, Lydia G.; Lo, Yu-Shui; Beebe, None; Harris, Joel M.

doi:10.1021/ac000873b

Characterization of Silane-Modified Immobilized Gold Colloids as a Substrate for Surface-Enhanced Raman Spectroscopy

Journal Article · Tue Jul 24 00:00:00 EDT 2001 · Analytical Chemistry

DOI:https://doi.org/10.1021/ac000873b· OSTI ID:2481105

Olson, Lydia G. ^[1]; Lo, Yu-Shui ^[1]; Beebe ^[1]; Harris, Joel M. ^[1]

University of Utah, Salt Lake City, UT (United States)

Immobilized gold colloid particles coated with a C-18 alkylsilane layer have been characterized as a substrate for surface-enhanced Raman scattering (SERS) studies of adsorption onto hydrophobic surfaces. Atomic force microscopy images, optical extinction spectra, and SERS measurements are reported as a function of accumulation of gold colloid on glass. As the metal particles become increasingly aggregated on the surface, the SERS enhancement increases until the plasmon resonance shifts to wavelengths longer than the excitation laser. The gold colloid substrates are stable and exhibit reproducible SERS enhancement. When octadecyltrimethoxysilane is self-assembled over the gold, the metal surface is protected from exposure to solution-phase species, as evidenced by the inhibition of chemisorption of a disulfide reagent to the overcoated gold surface. Furthermore, the results show that interactions with gold can be blocked by a silane layer so as not to significantly influence physisorption of molecules at the C-18/solution interface. The SERS enhancement from these C-18-overcoated gold substrates is reproducible for different films prepared from the same colloidal suspension; the substrates are also stable with time and upon exposure to laser irradiation.

View Accepted Manuscript (DOE)

Research Organization:: University of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG03-93ER14333

OSTI ID:: 2481105

Journal Information:: Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 17 Vol. 73; ISSN 0003-2700

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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