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Journal of Chemistry
Volume 2013 (2013), Article ID 585920, 7 pages
Research Article

Photosensitization of Colloidal SnO2 Semiconductor Nanoparticles with Xanthene Dyes

School of Chemistry, Bharathidasan University, Tiruchirappalli, Tamil Nadu 620 024, India

Received 2 May 2013; Revised 18 September 2013; Accepted 19 September 2013

Academic Editor: Veysel T. Yilmaz

Copyright © 2013 N. Nagarajan 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.


The photochemical behavior of xanthene dyes (fluorescein, erythrosine, and eosin) with colloidal SnO2 nanoparticles was probed by UV-visible, steady state, and time resolved fluorescence measurements. The prepared SnO2 nanoparticles were characterized by using UV-visible and powder XRD measurements. The xanthene dyes were adsorbed on the surface of colloidal SnO2 nanoparticles through electrostatic interaction. Apparent association constant ( ) was calculated from the relevant fluorescence data. The larger value of apparent association constant indicates a strong association between xanthene dyes and SnO2 nanoparticles. The fluorescence quenching is mainly attributed to electron transfer from the excited state xanthenes to the conduction band of colloidal SnO2. The electron transfer mechanism was explained based on the Rehm-Weller equation as well as the energy level diagram.