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Double-Beam Photoacoustic Spectroscopic Studies on Transient Absorption of Titanium(IV) Oxide Photocatalyst Powders
| Title: | Double-Beam Photoacoustic Spectroscopic Studies on Transient Absorption of Titanium(IV) Oxide Photocatalyst Powders |
| Authors: | Murakami, Naoya Browse this author | | Prieto Mahaney, Orlando Omar Browse this author | | Abe, Ryu Browse this author →KAKEN DB | | Torimoto, Tsukasa Browse this author →KAKEN DB | | Ohtani, Bunsho Browse this author →KAKEN DB |
| Issue Date: | 2007 |
| Publisher: | American Chemical Society |
| Journal Title: | Journal of Physical Chemistry C |
| Volume: | 111 |
| Issue: | 32 |
| Start Page: | 11927 |
| End Page: | 11935 |
| Publisher DOI: | 10.1021/jp071362x |
| Abstract: | In situ photoabsorption properties of titanium(IV) oxide (TiO2) powders under continuous ultraviolet irradiation were investigated by double-beam photoacoustic (PA) spectroscopy. This PA measurement enabled observation of two kinds of ultraviolet-light-induced intermediate species appearing on various kinds of TiO2 powder samples. Most of the samples (type 1) exhibited photoabsorption due to the production of trivalent titanium (Ti3+) species, while transient absorption assigned to trapped holes or surface peroxy species was also observed for anatase samples with a relatively large specific surface area (type 2). Time-resolved measurements and analyses of the kinetics of photoinduced Ti3+ species suggest that electrons accumulated in type-2 samples have high reactivity toward molecular oxygen compared to type-1 samples. Saturation limits of intensity of the PA signal attributed to Ti3+ species under deaerated conditions in the presence of surface-adsorbed methanol were estimated for both types of samples, and their linear relation with density of Ti3+ species estimated by a conventional photochemical technique was observed. This suggests that the present double-beam PA technique is an alternative feasible method for estimation of density of Ti3+ species, which is a potential measure of density of crystalline defects. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/48669 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 大谷 文章
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