Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 8, Issue 12, Pages 6569-6575Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2008.027
Keywords
Sol-Gel; Photoconductivity; Silver Colloids; Surfactant
Categories
Funding
- UCMEXUS
- CONACYT [43226-F]
- ECOS [M02-P02]
- DGAPA UNAM [IN111902, IN123804]
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We report on the photoconductive response of nanostructured sol-gel films in function of the silver nitrate concentration (ions and colloids). Silver colloids were obtained by spontaneous reduction process of Ag+ ions to Ag-0. 2-d hexagonal nanosructured sol-gel thin films were prepared by dip-coating method using the non-ionic diblock copolymer Brij58 to produce channels into the film, which house the silver nanoparticles. An optical absorption band located at 430 nm was detected by optical absorption; it corresponds to the surface plasmon. A 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 characterize their mechanisms of charge transport in the darkness and under illumination at 420 and 633 nm wavelengths. The films with silver colloids exhibit a photovoltaic effect stronger than the films with silver ions. While a photoconductive behaviour is observed in the films with silver ions.
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