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Proceedings Article

SERS on mesostructured thin films with silver nanoparticles

[+] Author Affiliations
Jorge A. Garcia-Macedo, Guadalupe Valverde

Univ. Nacional Autonoma de Mexico (Mexico)

Jenny Lockard, Jeffrey I. Zink

Univ. of California/Los Angeles (USA)

Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, 117 (June 14, 2004); doi:10.1117/12.529756
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From Conference Volume 5361

  • Quantum Dots, Nanoparticles, and Nanoclusters
  • Diana L. Huffaker; Pallab Bhattacharya
  • San Jose, CA, United States | January 26, 2004

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 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.
Citation

Jorge A. Garcia-Macedo ; Guadalupe Valverde ; Jenny Lockard and Jeffrey I. Zink
"SERS on mesostructured thin films with silver nanoparticles", Proc. SPIE 5361, Quantum Dots, Nanoparticles, and Nanoclusters, 117 (June 14, 2004); doi:10.1117/12.529756; http://dx.doi.org/10.1117/12.529756


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