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Proceedings Paper

A concetration-dependent model for silver colloids in nanostructured sol-gel materials
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Paper Abstract

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 Ag0 nanoparticles ) were obtained by spontaneous reduction process of Ag+ ions to Ag0. 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 plasmon 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.

Paper Details

Date Published: 24 August 2005
PDF: 11 pages
Proc. SPIE 5925, Nanophotonic Materials and Systems II, 59250X (24 August 2005); doi: 10.1117/12.617769
Show Author Affiliations
Jorge A. Garcia-Macedo, Univ. Nacional Autonoma de Mexico (Mexico)
Alfredo Franco, Univ. Nacional Autonoma de Mexico (Mexico)
Victor Renteria, Univ. Nacional Autonoma de Mexico (Mexico)
Guadalupe Valverde-Aguilar, Univ. of California/Los Angeles (United States)


Published in SPIE Proceedings Vol. 5925:
Nanophotonic Materials and Systems II
Zeno Gaburro; Stefano Cabrini, Editor(s)

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