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Photoacoustic spectroscopic analysis of photoinduced change in absorption of titanium(IV) oxide photocatalyst powders: A novel feasible technique for measurement of defect density by Naoya Murakami; Orlando Omar Prieto Mahaney; Tsukasa Torimoto; Bunsho Ohtani is a Physics and Astronomy article available to read on EtoBox.

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Photoabsorption properties of titanium(IV) oxide powders were investigated by photoacoustic (PA) spectroscopy. The photoacoustic spectra obtained under steady-state ultraviolet irradiation showed appearance and growth of two kinds of PA signal bands, which were attributable to trivalent titanium species (Ti 3+ ) and trapped holes or surface peroxide species. The saturation limit of the PA signal was estimated by analyzing the time course of Ti 3+ signals and compared to the density of Ti 3+ determined by a photochemical method. The results suggest that the photoacoustic spectroscopic technique is a feasible alternative method for estimation of Ti 3+ as an empirical measure of defect density.

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Author

Naoya Murakami; Orlando Omar Prieto Mahaney; Tsukasa Torimoto; Bunsho Ohtani

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0009-2614)

Published

2006

Language

EN

Field

Physics and Astronomy (Physical Sciences)