Femtosecond time-resolved X-ray absorption spectroscopy of anatase TiO2 nanoparticles using XFEL

被引：54
作者：
Obara, Yuki [1 ,2 ]
Ito, Hironori [3 ]
Ito, Terumasa [1 ]
Kurahashi, Naoya [4 ]
Thurmer, Stephan [4 ]
Tanaka, Hiroki [1 ]
Katayama, Tetsuo [5 ]
Togashi, Tadashi [5 ]
Owada, Shigeki [6 ]
Yamamoto, Yo-ichi [4 ]
Karashima, Shutaro [4 ]
Nishitani, Junichi [4 ]
Yabashi, Makina [6 ]
Suzuki, Toshinori [4 ]
Misawa, Kazuhiko [1 ,2 ,3 ]
机构：
[1] Tokyo Univ Agr & Technol, Dept Appl Phys, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan
[2] Tokyo Univ Agr & Technol, Inst Global Innovat Res, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan
[3] Tokyo Univ Agr & Technol, Interdisciplinary Res Unit Photon Nano Sci, 2-24-16 Naka Cho, Koganei, Tokyo 1848588, Japan
[4] Kyoto Univ, Grad Sch Sci, Dept Chem, Sakyo Ku, Kyoto 6068502, Japan
[5] Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan
[6] RIKEN SPring 8 Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan
来源：
STRUCTURAL DYNAMICS-US | 2017年 / 4卷 / 04期
关键词：
FREE-ELECTRON LASER; TO-IR SPECTROSCOPY; NANOCRYSTALLINE FILMS; DYNAMICS; PHOTOCATALYSIS; COORDINATION; XANES; MODEL;
D O I：
10.1063/1.4989862
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The charge-carrier dynamics of anatase TiO2 nanoparticles in an aqueous solution were studied by femtosecond time-resolved X-ray absorption spectroscopy using an X-ray free electron laser in combination with a synchronized ultraviolet femtosecond laser (268 nm). Using an arrival time monitor for the X-ray pulses, we obtained a temporal resolution of 170 fs. The transient X-ray absorption spectra revealed an ultrafast Ti K-edge shift and a subsequent growth of a pre-edge structure. The edge shift occurred in ca. 100 fs and is ascribed to reduction of Ti by localization of generated conduction band electrons into shallow traps of self-trapped polarons or deep traps at penta-coordinate Ti sites. Growth of the pre-edge feature and reduction of the above-edge peak intensity occur with similar time constants of 300-400 fs, which we assign to the structural distortion dynamics near the surface. (C) 2017 Author(s).
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页数：18
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