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 φ´τ 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.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.