18 March 2013 Photochemical activity of TiO2 nanotubes
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Proceedings Volume 8626, Oxide-based Materials and Devices IV; 86260S (2013) https://doi.org/10.1117/12.2000554
Event: SPIE OPTO, 2013, San Francisco, California, United States
Abstract
TiO2 is well known as a low-cost, highly active photocatalyst showing good environmental compatibility. Recently it was found that TiO2 nanotubes promise to enable for high photocatalytic activity (PCA). In our experiments, we studied the PCA and spectroscopic properties of TiO2 nanotube arrays formed by the anodization of Ti. The PCA efficiency related to the decomposition of methylene-blue was measured. To obtain reliable data, the results were calibrated by comparing with standard materials like Pilkington Activ™ which is a commercially available self cleaning glass. The studies included a search strategy for finding optimum conditions for the nanotube formation and the investigation of the relationship between PCA and annealing temperature. TiO2 nanotubes of different shapes and sizes were prepared by an anodization of Ti foil in different electrolytes, at variable applied voltages and concentrations. The photo-dissociation of methylene-blue was detected spectroscopically. For the optimized material, an enhancement factor of 2 in comparison to the standard reference material was found. Furthermore, femtosecond-laser induced photoluminescence and nonlinear absorption of the material were investigated. Possibilities for further enhancements of the PCA are discussed.
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A. Pfuch, F. Güell, T. Toelke, S. K. Das, H. Messaoudi, E. McGlynn, W. Seeber, C. Fábrega, T. Andreu, J. R. Morante, R. Grunwald, "Photochemical activity of TiO2 nanotubes", Proc. SPIE 8626, Oxide-based Materials and Devices IV, 86260S (18 March 2013); doi: 10.1117/12.2000554; https://doi.org/10.1117/12.2000554
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