SERS on mesostructured thin films with silver nanoparticles

Jorge A. García-Macedo, Guadalupe Valverde, Jenny Lockard, Jeffrey I. Zink

Research output: Contribution to journalConference article

10 Scopus citations

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 Ag o 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. ø1 0 and øμτ parameters are bigger than those from photorefractive crystals KnbO 3:Fe 3+. The photovoltaic effect increases with AgNO 3 concentration. Mesostructured film without silver colloids shows a small photovoltaic parameter.

Original languageEnglish (US)
Pages (from-to)117-124
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5361
DOIs
Publication statusPublished - Aug 16 2004
Externally publishedYes
EventQuantum Dots, Nanoparticles, and Nanoclusters - San Jose, CA, United States
Duration: Jan 26 2004Jan 27 2004

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Dip coating
  • Surface plasmon
  • Surfactant
  • Thin films

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