Friction evolution with transition from commensurate to incommensurate contacts between graphene layers
Friction evolution with transition from commensurate to incommensurate contacts between graphene layers
复制标题
石墨烯层之间从相称接触过渡到不相称接触的摩擦演化
DOI：
10.1016/j.triboint.2019.03.058
复制
发表时间：
2019-08-01
影响因子：
6.2
通讯作者：
Chen, Yunfei
中科院分区：
文献类型：
--
作者：
Dong, Yun;Duan, Zaoqi;Chen, Yunfei
通过分子动力学模拟，计算了两个接触的石墨烯片的界面原子力，定量地说明了从相称接触到不相称接触的摩擦演化。发现原子力分布呈现莫尔条纹。接触应力的云纹图案指示接触质量，而剪切应力的图案与摩擦力有关。在公度接触和非公度接触中，部分界面原子受到正摩擦力，而其他原子受到负摩擦力。然而，在无公度态下的界面摩擦力分布清楚地表明，正负原子摩擦力的分布比在公度态下更对称，从而产生超低的有效摩擦力。
By performing molecular dynamics simulations, the interfacial atomic forces of two contacting graphene flakes are calculated to quantitatively illustrate the friction evolution from commensurate to incommensurate contacts. It is found that the atomic force distributions display moire patterns. The moire patterns for the contact stress indicate the contact quality, while the patterns for the shear stress are related to the friction force. In both the commensurate and incommensurate contacts, part of the interface atoms experiences positive friction force while the other atoms negative friction force. However, the interfacial friction distributions for the incommensurate state clearly demonstrate that the positive and negative atomic friction forces distribute more symmetry than that in the commensurate state, which produces an ultra-low effective friction force.