TY - JOUR
T1 - A concentration-dependent model for silver colloids in nanostructured sol-gel materials
AU - García-Macedo, Jorge A.
AU - Franco, Alfredo
AU - Rentería, Victor
AU - Valverde-Aguilar, Guadalupe
PY - 2005
Y1 - 2005
N2 - We report on the physical modelling of the photoconductive response of nanostructured sol-gel films in function of the silver nitrate concentration (ions and colloids). This model considers several factors as the silver nitrate concentration and the transport parameters obtained. The model is compared with others commonly used. 2d -hexagonal nanostructured sol-gel thin films were prepared by dip-coating method using a non-ionic diblock copolymer Brij58 (surfactant) to produce channels into the film. Silver colloids (metallic Ag 0 nanoparticles) were obtained by spontaneous reduction process of Ag + ions to Ag 0. These nanoparticles were deposited into the channels formed by the surfactant. The structure was identified by X-ray diffraction and TEM. An absorption band located at 430 nm was detected by optical absorption; it corresponds to the plusmon surface. Fit to this band with modified Gans theory is presented. Photoconductivity studies were performed on films with silver ions and films with silver colloids to characterized their mechanisms of charge transport in the darkness and under illumination at 420, 633 nm wavelengths. Transport parameters were calculated. The films with silver colloids exhibit a photovoltaic effect stronger than the films with silver ions. While, the last ones possesses a photoconductivity behaviour.
AB - We report on the physical modelling of the photoconductive response of nanostructured sol-gel films in function of the silver nitrate concentration (ions and colloids). This model considers several factors as the silver nitrate concentration and the transport parameters obtained. The model is compared with others commonly used. 2d -hexagonal nanostructured sol-gel thin films were prepared by dip-coating method using a non-ionic diblock copolymer Brij58 (surfactant) to produce channels into the film. Silver colloids (metallic Ag 0 nanoparticles) were obtained by spontaneous reduction process of Ag + ions to Ag 0. These nanoparticles were deposited into the channels formed by the surfactant. The structure was identified by X-ray diffraction and TEM. An absorption band located at 430 nm was detected by optical absorption; it corresponds to the plusmon surface. Fit to this band with modified Gans theory is presented. Photoconductivity studies were performed on films with silver ions and films with silver colloids to characterized their mechanisms of charge transport in the darkness and under illumination at 420, 633 nm wavelengths. Transport parameters were calculated. The films with silver colloids exhibit a photovoltaic effect stronger than the films with silver ions. While, the last ones possesses a photoconductivity behaviour.
KW - Photoconductivity
KW - Silver colloids
KW - Sol-gel
KW - Surfactant
UR - http://www.scopus.com/inward/record.url?scp=31844433210&partnerID=8YFLogxK
U2 - 10.1117/12.617769
DO - 10.1117/12.617769
M3 - Artículo de la conferencia
AN - SCOPUS:31844433210
SN - 0277-786X
VL - 5925
SP - 1
EP - 11
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
M1 - 59250X
T2 - Nanophotonic Materials and Systems II
Y2 - 31 July 2005 through 1 August 2005
ER -