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Optical properties of in situ doped and undoped titania nanocatalysts and doped titania sol-gel nanofilms |
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| Authors: | A. Ferreira da Silva,I. Pepe,S.A. Tomá s,W.M. de Azevedo,R. Ahuja |
| Affiliation: | a Instituto de Fisica, Universidade Federal da Bahia, Campus Ondina, 40 210-340 Salvador, BA, Brazil b Schools of Physics and Mechanical Engineering, Georgia Institute of Technology Atlanta, GA 30332-0430,USA c Departamento de Física, CINVESTAV-IPN, AP 14-740, México D.F. 07300, Mexico d Facultad de Ciencias Físico-Matemáticas, BUAP, AP 1152, Puebla, Mexico e Departamento de Quimica Fundamental, Universidade Federal de Pernambuco, Cidade Universitaria, 50670-901 Recife, PE, Brazil f Departamento de Fisica, Universidade Federal de Pernambuco, Cidade Universitaria, 50670-901 Recife, PE, Brazil g Department of Physics, Uppsala University,SE-751 21 Uppsala, Sweden h Department of Materials Science and Engineering, Royal Institute of Technology SE-100 44 Stockholm, Sweden |
| Abstract: | In this paper we present spectroscopic properties of doped and undoped titanium dioxide (TiO2) as nanofilms prepared by the sol-gel process with rhodamine 6G doping and studied by photoacoustic absorption, excitation and emission spectroscopy. The absorption spectra of TiO2 thin films doped with rhodamine 6G at very low concentration during their preparation show two absorption bands, one at 2.3 eV attributed to molecular dimmer formation, which is responsible for the fluorescence quenching of the sample and the other at 3.0 eV attributed to TiO2 absorption, which subsequently yields a strong emission band at 600 nm. The electronic band structure and optical properties of the rutile phase of TiO2 are calculated employing a fully relativistic, full-potential, linearized, augmented plane-wave (FPLAPW) method within the local density approximation (LDA). Comparison of this calculation with experimental data for TiO2 films prepared for undoped sol-gels and by sputtering is performed. |
| Keywords: | 71.15.Mb 71.20.Nr 78.20.ci 81.40.Tv |
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