Synchrotron-Radiation Photoemission Study of Growth and Stability of Au Clusters on Rutile TiO2(110)-1×1
- Received Date: 2009-04-30
- Synchrotron-radiation photoelectron spectroscopy, Au cluster, TiO2(110), Charge transfer, Thermal stability
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.
|Citation:||Xin Yu, Ling-shun Xu, Wen-hua Zhang, Zhi-quan Jiang, Jun-fa Zhu, Wei-xin Huang. Synchrotron-Radiation Photoemission Study of Growth and Stability of Au Clusters on Rutile TiO2(110)-1×1[J]. Chinese Journal of Chemical Physics , 2009, 22(4): 339-345. doi: 10.1088/1674-0068/22/04/339-345|