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Title: Optical properties of in situ doped and undoped titania nanocatalysts and doped titania sol–gel nanofilms
Other Titles: Applied Surface Science
Authors: Silva, A. Ferreira da
Pepe, Iuri Muniz
Gole, James L.
Tomás, S. A.
Palomino, R.
Azevedo, W. M. de
Silva Junior, E. F. da
Ahuja, Rajeev
Persson, C.
Keywords: Polymer;TiO2 nanofilms;Electronic band structure;Rhodamine 6G doping
Issue Date: 2006
Publisher: Applied Surface Science
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. PACS 71.15.Mb; 71.20.Nr; 78.20.ci; 81.40.Tv
Description: RESTRITO
URI: http://www.repositorio.ufba.br/ri/handle/ri/6521
ISSN: 0169-4332
Appears in Collections:Artigos Publicados em Periódicos (FIS)

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