催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (10): 1712-1716.DOI: 10.3724/SP.J.1088.2012.20640

• 研究论文 • 上一篇    下一篇

Cu 在 ZrO2(111) 薄膜载体上的生长与界面相互作用

侯建波, 韩永, 潘永和, 徐倩, 潘海斌, 朱俊发*   

  1. 中国科学技术大学国家同步辐射实验室, 安徽合肥 230029
  • 收稿日期:2012-06-20 修回日期:2012-07-25 出版日期:2012-09-28 发布日期:2012-09-28

Growth and Interfacial Interaction of Cu on ZrO2(111) Thin Film

HOU Jianbo, HAN Yong, PAN Yonghe, XU Qian, PAN Haibin, ZHU Junfa*   

  1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui, China
  • Received:2012-06-20 Revised:2012-07-25 Online:2012-09-28 Published:2012-09-28

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摘要： 采用分子束外延法在 Pt(111) 单晶表面上制备有序的 ZrO2(111) 薄膜, 利用低能电子衍射谱、同步辐射光电子能谱和 X 射线光电子能谱研究了 Cu 纳米颗粒在 ZrO2(111) 薄膜表面的生长模式和界面相互作用. 结果表明, 室温下 Cu 先以二维模式生长到 0.15 单层 (ML), 接着以三维模式生长. 随着 Cu 覆盖度的减小, Cu 2p3/2 峰逐渐向高结合能位移, 可归因于初态效应和终态效应共同作用的结果. Cu 最初沉积到 ZrO2 表面时, 两者间存在较强的相互作用, Cu 向 ZrO2 衬底传递电荷, 以 Cu(I) 形式出现. 当 Cu 覆盖度增加到 1 ML 以后, Cu 开始表现出金属特征.

关键词: 铜, 二氧化锆, 低能电子衍射谱, X 射线光电子能谱, 同步辐射光电子能谱, 界面相互作用, 初态效应, 终态效应

Abstract: The growth mode and interfacial interaction of Cu nanoparticles on the ordered ZrO2(111) thin film surfaces have been studied by low energy electron diffraction, synchrotron radiation photoemission spectroscopy, and X-ray photoelectron spectroscopy. The ZrO2(111) thin film was grown on Pt(111) using the molecular beam epitaxy technique. At room temperature, copper initially grows two-dimensionally on the ZrO2(111) thin film up to 0.15 monolayer (ML), followed by three-dimensional islanding. The binding energy of Cu 2p3/2 increases with decreasing the Cu coverage, owing to the contribution from both the initial-state and final-state effects. The interaction between Cu and ZrO2 leads to the charge transfer from Cu to the ZrO2 substrate, which causes the appearance of Cu(I) state. Above 1 ML, Cu becomes metallic state on ZrO2.

Key words: copper, zirconia, low energy electron diffraction, X-ray photoelectron spectroscopy, synchrotron radiation photoemission spectroscopy, interfacial interaction, initial-state effect, final-state screening