A concentration-dependent model for silver colloids in nanostructured sol-gel materials

Jorge A. García-Macedo, Alfredo Franco, Victor Rentería, Guadalupe Valverde-Aguilar

Producción científica: Contribución a una revistaArtículo de la conferenciarevisión exhaustiva

Resumen

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.

Idioma originalInglés
Número de artículo59250X
Páginas (desde-hasta)1-11
Número de páginas11
PublicaciónProceedings of SPIE - The International Society for Optical Engineering
Volumen5925
DOI
EstadoPublicada - 2005
Publicado de forma externa
EventoNanophotonic Materials and Systems II - San Diego, CA, Estados Unidos
Duración: 31 jul. 20051 ago. 2005

Huella

Profundice en los temas de investigación de 'A concentration-dependent model for silver colloids in nanostructured sol-gel materials'. En conjunto forman una huella única.

Citar esto