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Synchrotron-Radiation Photoemission Study of Growth and Stability of Au Clusters on Rutile TiO2(110)-1×1
Xin Yu1, Ling-shun Xu1, Wen-hua Zhang2, Zhi-quan Jiang1, Jun-fa Zhu2, Wei-xin Huang*1
1.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
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1,2, 许令顺1, 张文华2, 姜志全1, 朱俊发2, 黄伟新*1
1.中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026;2.中国科学技术大学国家同步辐射实验室,合肥230029
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: