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

Jorge A. Garcia-Macedo; Alfredo Franco; Victor Renteria; Guadalupe Valverde-Aguilar

doi:10.1117/12.617769

23 August 2005 A concetration-dependent model for silver colloids in nanostructured sol-gel materials

Jorge A. Garcia-Macedo, Alfredo Franco, Victor Renteria, Guadalupe Valverde-Aguilar

Proceedings Volume 5925, Nanophotonic Materials and Systems II; 59250X (2005) https://doi.org/10.1117/12.617769
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Jorge A. Garcia-Macedo, Alfredo Franco, Victor Renteria, and Guadalupe Valverde-Aguilar "A concetration-dependent model for silver colloids in nanostructured sol-gel materials", Proc. SPIE 5925, Nanophotonic Materials and Systems II, 59250X (23 August 2005); https://doi.org/10.1117/12.617769

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