Atomic Friction Investigations on Ordered Superstructures
Atomic Friction Investigations on Ordered Superstructures
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DOI：
10.1007/s11249-010-9677-2
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发表时间：
2010-09-01
影响因子：
3.2
通讯作者：
Bennewitz, Roland
中科院分区：
文献类型：
--
作者：
Steiner, Pascal;Gnecco, Enrico;Bennewitz, Roland
我们回顾了最近通过原子力显微镜对有序上层结构进行的摩擦测量。特别是，我们考虑了 NaCl(001) 和 Cu(001) 表面上的超薄 KBr 薄膜、SiC(0001) 上的单层和双层石墨烯以及 Au(111) 的人字形重构。这些系统的原子分辨摩擦图像显示了跨越多个晶胞的周期性特征。尽管形成这些上层建筑的物理机制有很大不同，但实验结果可以在相同的现象学框架内解释。实验和建模之间的比较表明，在 NaCl(001) 上的 KBr 薄膜和石墨烯薄膜的情况下，尖端-表面相互作用可以通过具有基底周期性的电势很好地描述，该电势被调制或分别与具有上层结构对称性的电势叠加。
We review recent friction measurements on ordered superstructures performed by atomic force microscopy. In particular, we consider ultrathin KBr films on NaCl(001) and Cu(001) surfaces, single and bilayer graphene on SiC(0001), and the herringbone reconstruction of Au(111). Atomically resolved friction images of these systems show periodic features spanning across several unit cells. Although the physical mechanisms responsible for the formation of these superstructures are quite different, the experimental results can be interpreted within the same phenomenological framework. A comparison between experiments and modeling shows that, in the cases of KBr films on NaCl(001) and of graphene films, the tip-surface interaction is well described by a potential with the periodicity of the substrate which is modulated or, respectively, superimposed with a potential with the symmetry of the superstructure.