PEEM study of work function changes in Cu, Au and Pd metal surfaces with surface acoustic wave propagation
PEEM study of work function changes in Cu, Au and Pd metal surfaces with surface acoustic wave propagation
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DOI：
10.1016/j.susc.2006.03.047
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发表时间：
2006-07-01
期刊：
影响因子：
1.9
通讯作者：
Inoue, Yasunobu
中科院分区：
文献类型：
--
作者：
Nishiyama, Hiroshi;Inoue, Yasunobu
利用光电子发射显微镜（PEEM）研究了声表面波（SAW）对不同表面结构的Cu、Au和Pd金属表面功函数的影响。SAW传播产生明亮的PEEM图像的Cu，An和Pd金属表面组成的高指数的平面和步骤网站，而它产生黑暗的图像的金属暴露低指数的平面，表明SAW增强的光电子发射从粗糙的金属表面含有配位不饱和的金属原子和降低，从密集的光滑的金属表面。SAW开和SAW关的PEEM图像的变化是可逆的，并且分别与金属表面功函数的降低和增加相关。SAW引起周期性和垂直的晶格位移，它被证明是负责从光电子和晶格位移的图案之间的重合功函数的变化，大的晶格位移。基于对金属表面空间结构和电子性质的影响，提出了功函数变化的机理。(c)2006年爱思唯尔B.V.所有权利应得的。
The effects of surface acoustic wave (SAW) on the work function of Cu, An and Pd metal surfaces with different surface structures were studied by photoelectron emission microscopy (PEEM). SAW propagation produced bright PEEM images for Cu, An and Pd metal surfaces consisting of high-index planes and step sites, whereas it yielded dark images for the metals exposing low-index planes, indicating that the SAW enhanced photoemission from rough metal surfaces containing coordinatively-unsaturated metal atoms and lowered that from densely packed smooth metal surfaces. Changes in the PEEM images with SAW-on and SAW-off were reversible and were associated with decreases and increases in the work function of the metal surfaces, respectively. The SAW caused periodic and vertical lattice displacement, and it was demonstrated that large lattice displacement was responsible for work function changes from coincidence between the patterns of photoemission and lattice displacement. A mechanism for work function changes is proposed on the basis of effects on the spatial structures and electronic properties of metal surfaces. (c) 2006 Elsevier B.V. All rights deserved.