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Synchrotron-Radiation Photoemission Study of Growth and Stability of Au Clusters on Rutile TiO2(110)-1×1
Xin Yu,Ling-shun Xu,Wen-hua Zhang,Zhi-quan Jiang,Jun-fa Zhu,Wei-xin Huang*
Author NameAffiliationE-mail
Xin Yu Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Ling-shun Xu Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Wen-hua Zhang National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Zhi-quan Jiang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Jun-fa Zhu National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Wei-xin Huang* Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China huangwx@ustc.edu.cn 
Abstract:
The growth and thermal stability of Au clusters on a partially-reduced rutile TiO2(110)-1×1 surface were investigated by high-resolution photoelectron spectroscopy using synchrotron- radiation-light. The valence-band photoelectron spectroscopy results demonstrate that the Ti3+3d feature attenuates quickly with the initial deposition of Au clusters, implying that Au clusters nucleate at the oxygen vacancy sites. The Au4f core-level photoelectron spectroscopy results directly prove the existence of charge transfer from oxygen vacancies to Au clusters. The thermal stability of Au clusters on the partially-reduced and stoichiometric TiO2(110) surfaces was also comparatively investigated by the annealing experiments. With the same film thickness, Au clusters are more thermally stable on the partially-reduced TiO2(110) surface than on the stoichiometric TiO2(110) surface. Meanwhile, large Au nanoparticles are more thermally stable than fine Au nanoparticles.
Key words:  Synchrotron-radiation photoelectron spectroscopy, Au cluster, TiO2(110), Charge transfer, Thermal stability
FundProject:
Synchrotron-Radiation Photoemission Study of Growth and Stability of Au Clusters on Rutile TiO2(110)-1×1
于欣,许令顺,张文华,姜志全,朱俊发,黄伟新*
摘要:
利用同步辐射高分辨光电子能谱研究了金团簇在部分还原TiO2-(1×1)表面的生长和稳定性.价带谱实验结果观察到非常少量金团簇的沉积导致了Ti3+的3d峰完全消失,表明金团簇成核在TiO2-(1×1)表面的氧缺陷位.Au4f芯电子光电子能谱实验结果证明了TiO2-(1×1)表面氧缺陷位向金团簇转移电荷.还对比研究了化学剂量比和部分还原的TiO2-(1×1)表面上金团簇的热稳定性.当金团簇尺寸相近时部分还原的TiO2-(1×1)表面上金团簇要比化学剂量比的TiO2-(1×1)面上金团簇稳定;在相同的表面上尺寸大的金团簇要比尺寸小的金团簇稳定.
关键词:  同步辐射光电子能谱,金团簇,TiO2(110),电荷转移,热稳定性
DOI:10.1088/1674-0068/22/04/339-345
分类号: