TY - JOUR
T1 - SERS on mesostructured thin films with silver nanoparticles
AU - García-Macedo, Jorge A.
AU - Valverde, Guadalupe
AU - Lockard, Jenny
AU - Zink, Jeffrey I.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
KW - Dip coating
KW - Surface plasmon
KW - Surfactant
KW - Thin films
UR - http://www.scopus.com/inward/record.url?scp=3543140612&partnerID=8YFLogxK
U2 - 10.1117/12.529756
DO - 10.1117/12.529756
M3 - Artículo de la conferencia
AN - SCOPUS:3543140612
SN - 0277-786X
VL - 5361
SP - 117
EP - 124
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Quantum Dots, Nanoparticles, and Nanoclusters
Y2 - 26 January 2004 through 27 January 2004
ER -