Atomic-scale metal adhesion investigated by scanning tunneling microscopy
Atomic-scale metal adhesion investigated by scanning tunneling microscopy
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通过扫描隧道显微镜研究原子尺度金属粘附
DOI：
10.1147/rd.384.0347
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
U. Dürig
中科院分区：
文献类型：
--
作者：
U. Dürig
从理论和实验两个方面研究了尖端金属尖端与金属表面的相互作用。根据已知的块体金属粘结理论，采用有效势法，系统地分析了针尖-样品力的特性。描述了用力梯度传感和隧道显微镜相结合的方法来探测短程粘着相互作用的实验。研究发现，基于宏观粘附力的概念并不能普遍适用于描述观察到的尖端-样品力梯度特性。然而，这些特征可以用从团簇计算确定的有效相互作用以半定量的方式来解释。通过探测短程相互作用所获得的化学信息也可以用来识别金属表面的吸附。
The interaction of a sharply pointed metal tip with a metal surface is investigated both theoretically and experimentally. By resorting to an effective potential approach, the characteristics of tip-sample forces are analyzed systematically in terms of known theory of bulk metal adhesion. Experiments probing the short-range adhesion interaction by means of a combination of force gradient sensing with tunneling microscopy are described. It is found that the concepts based on adhesion at a macroscopic level are not generally applicable in describing the observed tip-sample force gradient characteristics. These characteristics can, however, be explained in a semiquantitative way using effective interactions determined from a cluster calculation. It is also shown that the chemical information obtained by probing short-range interactions can be used to identify adsorbates on metal surfaces.