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).

引用

页数：18

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