Au Clusters on TiO2(110) (1 脳 1) and (1 脳 2) Surfaces Examined by Polarization-Dependent Total Reflection Fluorescence XAFS

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• 作者：Wang-Jae Chun ; Kotaro Miyazaki ; Naoki Watanabe ; Yuichiro Koike ; Satoru Takakusagi ; Keisuke Fujikawa ; Masaharu Nomura ; Yasuhiro Iwasawa ; Kiyotaka Asakura
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 10, 2013
• 年：2013
• 卷：117
• 期：1
• 页码：252-257
• 全文大小：452K
• 年卷期：v.117,no.1(January 10, 2013)
• ISSN：1932-7455

文摘

The structure of Au clusters on the TiO₂(110) surface and the cluster-substrate interaction were investigated by polarization-dependent total reflection fluorescence X-ray absorption fine structure (PTRF-XAFS). The TiO₂(110) (1 脳 1) and (1 脳 2) surfaces were compared in terms of substrate structural effects on Au cluster structure. We could not find evidence for the direct Au-substrate bonding and observed that the substrate morphology did not significantly affect the size and structure of Au clusters. Finally, we precisely determined that the Au clusters favored a geometry with icosahedral Au₅₅ symmetry. We discuss the possible interaction mechanism between Au and TiO₂(110) that leads to these results.