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Journal of Chemistry
Volume 2014, Article ID 589707, 6 pages
http://dx.doi.org/10.1155/2014/589707
Research Article

Study of Band Gap of Silver Nanoparticles—Titanium Dioxide Nanocomposites

1Physics Department, University of Calabria, Via Bucci 31C, 87036 Rende, Italy
2Biology, Ecology and Earth Science Department, University of Calabria, Via Bucci 4B, 87036 Rende, Italy

Received 8 January 2014; Accepted 21 March 2014; Published 9 April 2014

Academic Editor: Mallikarjuna N. Nadagouda

Copyright © 2014 P. Barone et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The optical and chemical properties of Ag/TiO2 nanocomposites were investigated to explore the possibilities of incorporating these new materials in Gratzel photoelectrochemical cells. The nanocomposites were obtained doping TiO2, in both allotropic species anatase and rutile, with silver nanoparticles (grown by laser ablation process). X-ray photoelectron data indicate the absence of Ag-Ti chemical bonds, while measurements of photoluminescence and optical absorbance in UV-visible range show a quench in photoluminescence emission of about 50% and an increase in visible absorbance of about 20%. Measurements of optical band gap, obtained by Tauc’s equation, indicate a variation of about 1.6 eV.