Preferential sliding directions on graphite
Preferential sliding directions on graphite
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DOI：
10.1103/physrevb.89.245440
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发表时间：
2014-06-25
影响因子：
3.7
通讯作者：
Bennewitz, Roland
中科院分区：
文献类型：
--
作者：
Balakrishna, S. G.;de Wijn, Astrid S.;Bennewitz, Roland
采用摩擦力显微镜和模型试验相结合的方法研究了石墨表面摩擦的各向异性。摩擦力矢量与牵引方向的偏差可达15度。最强的偏差被发现的拉动方向几乎位于沿着一个锯齿形方向的蜂窝结构，优选的滑动方向上的石墨表面和外延生长在SiC（0001）上的石墨烯。沿着沿着和穿过分子行的原子粘滑事件决定摩擦的方向和大小。模拟和建模揭示了温度的作用和摩擦各向异性的表面势的二维字符。
The anisotropy of friction on graphitic surfaces is investigated by a combined friction force microscopy and modeling study. Friction vectors deviate up to 15 degrees from pulling directions. The strongest deviations are found for pulling directions which lie almost along one zigzag direction of the honeycomb structure, the preferred sliding direction on graphite surfaces and epitaxial graphene grown on SiC(0001). Atomic stick-slip events along and across molecular rows determine direction and magnitude of friction. Simulation and modeling reveal the role of temperature and of the two-dimensional character of the surface potential for the friction anisotropy.