Understanding of the correlation between work function and surface morphology of metals and alloys
Understanding of the correlation between work function and surface morphology of metals and alloys
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了解金属和合金的功函数与表面形貌之间的相关性
DOI：
10.1016/j.jallcom.2013.04.113
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发表时间：
2013-11-15
影响因子：
6.2
通讯作者：
Li, Wen
中科院分区：
文献类型：
--
作者：
Xue, Mingshan;Wang, Wenfeng;Li, Wen
材料行为与结构之间的关系极为复杂，了解这些关系对于揭示各种材料的物理、化学和力学性能具有重要意义。在这项研究中，作为表面粗糙度的函数的金属和合金的功函数（WF）的变化进行了研究，通过扫描开尔文探针，目的是了解WF和表面形貌之间的内在相关性，使用一个简单而直观的方式。结果表明，在粗糙的Cu和Ag表面，尖锐的微/纳米结构诱导了较低的WF，就像避雷针效应为电子输运提供了直接和快速的路径。而对于Al和Mg合金，由于表面氧化层的作用，粗糙表面导致WF增加，就像避雷针效应提供了一个保护层来限制电子输运一样。(c)2013 Elsevier B. V.保留所有权利。
The relationships between material behaviors and its structures are extremely complicated, and the understanding of these relationships is of much significance for revealing the physical, chemical and mechanical properties of various materials. In this study, the change of the work function (WF) of metals and alloys as a function of surface roughness was investigated by scanning Kelvin probe, with the aim of understanding the inherent correlation between the WF and surface morphology using a simple and intuitive way. It was demonstrated that at the rough surface of Cu and Ag, the sharp micro/nanostructures induced a lower WF, just as the lightning rod effect providing a direct and fast path for electron transport. While for Al and Mg alloys, the rough surface resulted in an increase of the WF owing to the effect of surface oxide layers, just as the anti-lightning rod effect providing a protected layer to confine the electron transport. (c) 2013 Elsevier B.V. All rights reserved.