J. Phys. IV France 125 (2005) 415-417
DOI: 10.1051/jp4:2005125097

Optical properties of rhodamine 6G-doped TiO₂ sol-gel films

S.A. Tomás¹, S. Stolik¹, R. Palomino², R. Lozada², C. Persson³, R. Ahuja⁴, I. Pepe⁵ and A. Ferreira da Silva<sup>5

1</sup>  Departamento de Física, CINVESTAV-IPN, AP 14-740, Mexico 07300, DF, Mexico
²  Facultad de Ciencias Físico-Matemáticas, BUAP, AP 1152, Puebla, Mexico
³  Royal Institute of Technology, 100 44 Stockholm, Sweden
⁴  Department of Physics, Uppsala University, 751 21 Uppsala, Sweden
⁵  Instituto de Fisica, Universidade Federal da Bahia, Ondina 40 210 340 Salvador, Ba, Brazil

Abstract
The optical properties of titania (TiO₂) thin films prepared by the sol-gel process and doped with rhodamine 6G were studied by Photoacoustic Spectroscopy. Rhodamine 6G-doping was achieved by adding 0.01%, 0.02%, 0.05% y 0.1% mol rhodamine to a solution that contained titanium isopropoxide as precursor. Two absorption regions were distinguished in the absorption spectrum of a typical rhodamine 6G-doped TiO₂ film. A shift of these bands occured as a function of rhodamine 6G-doping concentration. In addition, the optical absorption and band gap energy for rutile-phase TiO₂ films were calculated employing the full-potential linearized augmented plane wave method. A comparison of these calculations with experimental data of TiO₂ films prepared by sol-gel at room temperature was performed.

© EDP Sciences 2005