Growth, Structure, and Stability of Au on Ordered ZrO2(111) Thin Films

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• 作者：Yonghe Pan ; Yan Gao ; Guodong Wang ; Dandan Kong ; Liang Zhang ; Jianbo Hou ; Shanwei Hu ; Haibin Pan ; Junfa Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：June 2, 2011
• 年：2011
• 卷：115
• 期：21
• 页码：10744-10751
• 全文大小：973K
• 年卷期：v.115,no.21(June 2, 2011)
• ISSN：1932-7455

文摘

The growth, electronic properties, and thermal stability of Au nanoparticles on ordered ZrO₂(111) thin film surfaces were investigated by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), and synchrotron radiation photoemission spectroscopy (SRPES). The thin ZrO₂(111) films were grown on a Pt(111) substrate. At room temperature, Au initially grows as 2D islands on the ZrO₂(111) thin films up to 0.1 ML, followed by 3D growth with a number density of 1.4 脳 10¹² particles/cm². The binding energy of the Au 4f peaks shifts monotonically toward a higher binding energy with decreasing the Au particle size by 0.4 eV, which can be attributed to the contribution from both the initial- and final-state effects. Au atoms most likely form Au^{未鈭?/sup> initially and become metallic states as the coverage increases. Thermal annealing experiments demonstrate that Au particles experience significant sintering before desorption from the ZrO₂(111) surface. In addition, Au particles are more thermally stable on the sputtered ZrO₂(111) surface than on the pristine ZrO₂(111) surface due to the stronger bonding of Au atoms on the surface defect sites. Moreover, large Au particles are more thermally stable than small ones on the ZrO₂(111) surface.}