2024-03-28T09:28:13Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/145872022-11-17T02:08:08Zhdl_2115_20059hdl_2115_151Photoacoustic spectroscopic analysis of photoinduced change in absorption of titanium(IV) oxide photocatalyst powders : A novel feasible technique for measurement of defect densityMurakami, NaoyaPrieto Mahaney, Orlando OmarTorimotoa, Tsukasa1000080176924Ohtani, Bunshoopen access431.3Photoabsorption 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 (Ti3+) and trapped holes or surface peroxide species. The saturation limit of the PA signal was estimated by analyzing the time course of Ti3+ signals and compared to the density of Ti3+ determined by a photochemical method. The results suggest that the photoacoustic spectroscopic technique is a feasible alternative method for estimation of Ti3+ as an empirical measure of defect density.Elsevier B.V.2006-07-26engjournal articleAMhttp://hdl.handle.net/2115/14587http://www.sciencedirect.com/science/journal/00092614https://doi.org/10.1016/j.cplett.2006.06.0010009-2614Chemical Physics Letters4261-3204208https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/14587/1/CPL.pdfapplication/pdf406.73 KB2006-07-26