Comparison of frictional forces on graphene and graphite
Comparison of frictional forces on graphene and graphite
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DOI：
10.1088/0957-4484/20/32/325701
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发表时间：
2009-08-12
期刊：
影响因子：
3.5
通讯作者：
Lee, SangWook
中科院分区：
文献类型：
--
作者：
Lee, Hyunsoo;Lee, Naesung;Lee, SangWook
我们使用横向力显微镜报告了 SiN 尖端和石墨烯/石墨表面之间的摩擦力。我们使用的悬臂由 SiN 膜制成，刚度较低，为 0.006 N m(-1)。我们在覆盖有氧化硅的硅晶片上制备了石墨烯薄片。石墨烯上的摩擦力小于Si氧化物上的摩擦力，并且大于石墨（石墨烯多层）上的摩擦力。力谱也被用来研究石墨烯和尖端之间的范德华力。判断范德华力也是石墨-石墨烯-氧化硅的顺序，推测摩擦力与范德华相互作用有关。由于作用在表面上的法向力远弱于吸引力，例如范德华力，因此摩擦力与法向力的强度无关。摩擦的速度依赖性表现出对数行为，这归因于热激活的粘滑效应。
We report on the frictional force between an SiN tip and graphene/graphite surfaces using lateral force microscopy. The cantilever we have used was made of an SiN membrane and has a low stiffness of 0.006 N m(-1). We prepared graphene flakes on a Si wafer covered with silicon oxides. The frictional force on graphene was smaller than that on the Si oxide and larger than that on graphite (multilayer of graphene). Force spectroscopy was also employed to study the van der Waals force between the graphene and the tip. Judging that the van der Waals force was also in graphite-graphene-silicon oxide order, the friction is suspected to be related to the van der Waals interactions. As the normal force acting on the surface was much weaker than the attractive force, such as the van der Waals force, the friction was independent of the normal force strength. The velocity dependency of the friction showed a logarithmic behavior which was attributed to the thermally activated stick-slip effect.