有序ZrO2(111)薄膜在Pt(111)表面的外延生长
Epitaxial growth of ultrathin ZrO2(111) films on Pt(111)
利用低能电子衍射（LEED）、同步辐射光发射谱（SRPES）和X射线光电子能谱（XPS）技术研究有序ZrO2薄膜在Pt（111）单晶表面的外延生长。薄膜的制备是通过在氧气氛围下在Pt（111）表面上热蒸发金属Zr 并随后对薄膜表面进行退火完成的。实验结果表明：薄膜的生长在初始阶段呈现不连续低维岛状的有序生长，并且岛的尺寸和结构依赖于ZrO2薄膜厚度。在低覆盖度情况下（θ < 0.5 ML）， （√19x√19）R23.4˚和（5×5）两种结构并存。随着薄膜覆盖度增加， （√19x√19）R23.4˚结构的长程有序度逐步增加，同时（5×5）结构逐步消失。当薄膜覆盖度达到6单层（ML）以上时，连续结构的ZrO2（111）薄膜形成，表面呈现出ZrO2（111）-（1x1）和（2x2）共存的LEED衍射花样。用这种方法制得的有序ZrO2薄膜为体相ZrO2提供了一个很好的模型表面，可进一步利用表面科学研究手段研究ZrO2表面的各种性质。
Ordered ZrO2 films were epitaxially grown on Pt(111) and characterized by low energy electron diffraction (LEED), synchrotron radiation photoemission spectroscopy (SRPES) and X-ray photoelectron spectroscopy (XPS). The films are prepared by oxidizing the physical vapor-deposited zirconium in an O2 atmosphere followed by annealing. The films grow as discontinuous low-dimensional islands with ordered structures at low coverage. The sizes and structures of the islands are dependent on the coverage of ZrO2 films. At coverage lower than 0.5 ML (monolayer), (√19x√19)R23.4˚ and (5×5) structures coexist. With increasing coverage, the (√19x√19)R23.4˚ structure develops with increasing degree of long-range order, while the (5×5) structure fades gradually. When the coverage reaches above 6 ML, a continuous ZrO2(111) film is formed whose surface exhibits a (1x1) LEED pattern coexisting with a (2x2) pattern. These well-ordered thin ZrO2 films provide good model surfaces for bulk ZrO2 and can be used to further study the catalytic properties of ZrO2 using modern surface science techniques.
许杨、王国栋、朱俊发、潘永和、张亮、张文华、高艳
物理学晶体学材料科学
外延生长ZrO2薄膜LEED同步辐射光电子能谱
Epitaxial growthordered thin ZrO2 filmsLEEDSRPES
许杨,王国栋,朱俊发,潘永和,张亮,张文华,高艳.有序ZrO2(111)薄膜在Pt(111)表面的外延生长[EB/OL].(2010-04-23)[2025-08-11].http://www.paper.edu.cn/releasepaper/content/201004-859.点此复制
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