Optical characterization of sol gel TiO2 monoliths doped with Brilliant Green |
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| Authors: | S. A. Tomás O. Zelaya R. Palomino R. Lozada O. García J. M. Yáñez A. Ferreira da Silva |
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| Affiliation: | (1) Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, AP 14-740, México 07300, D.F., Mexico;(2) Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, AP 1152, Puebla, Pue., Mexico;(3) Centro de Investigación y de Estudios Avanzados del IPN-Unidad Querétaro, Libramiento Norponiente 2000, Fracc. Real de Juriquilla, Querétaro, 76230 Qro., Mexico;(4) Instituto de Fisica, Universidade Federal da Bahia, Campus Universitario de Ondina, 40210-340 Salvador, Bahia, Brazil |
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| Abstract: | Amorphous titanium dioxide monoliths doped with brilliant green (BG) were synthesized by the sol-gel process. The optical properties of the monoliths were characterized by Photoacoustic Spectroscopy and Photoluminescence Spectroscopy. The absorption spectra for the BG-doped TiO2 monoliths exhibited two well defined absorption regions: a band below 400 nm corresponding to TiO2 absorption and three absorption bands centered at 424 nm, 588 nm, and 632 nm due to brilliant green. While the undoped TiO2 monoliths showed no luminescence, the doped samples showed a strong luminescence band at 673 nm, which increased its intensity for increasing organic dye doping. |
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