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Proceedings Paper

SERS on mesostructured thin films with silver nanoparticles
Author(s): Jorge A. Garcia-Macedo; Guadalupe Valverde; Jenny Lockard; Jeffrey I. Zink
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Paper Abstract

Mesostructured 2d-hexagonal sol-gel films were prepared by dip-coating method. Their structures were detected by X-ray diffraction. Silver nanoparticles reduced from Ag+ ion (silver nitrate) to Ag0 were deposited into the channels of the structure produced by the neutral surfactant Brij58. Surface enhanced raman spectroscopy technique was used to characterize the films. Spectra of films without metallic particles were compared to those with silver nanoparticles; the earliest exhibit an increased intensity on the 885, 955, 1061, 1129, 1230,1429, 1521, and 1796 cm-1 bands. This enhancement due to SERS is the result of the surface plasmon excitation inside the silver particles causing a reactivation of the Raman scattering from the molecules on the surface colloids. Photoconductivity studies were performed on mesostructured films with silver colloids. φl0 and φµτ parameters are bigger than those from photorefractive crystals KnbO3:Fe3+. The photovoltaic effect increases with AgNO3 concentration. Mesostructured film without silver colloids shows a small photovoltaic parameter.

Paper Details

Date Published: 14 June 2004
PDF: 8 pages
Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, (14 June 2004); doi: 10.1117/12.529756
Show Author Affiliations
Jorge A. Garcia-Macedo, Univ. Nacional Autonoma de Mexico (Mexico)
Guadalupe Valverde, Univ. Nacional Autonoma de Mexico (Mexico)
Jenny Lockard, Univ. of California/Los Angeles (United States)
Jeffrey I. Zink, Univ. of California/Los Angeles (United States)


Published in SPIE Proceedings Vol. 5361:
Quantum Dots, Nanoparticles, and Nanoclusters
Diana L. Huffaker; Pallab Bhattacharya, Editor(s)

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