Achieving a superlubricating ohmic sliding electrical contact via a 2D heterointerface: a computational investigation
Achieving a superlubricating ohmic sliding electrical contact via a 2D heterointerface: a computational investigation
复制标题
通过二维异质界面实现超级润滑欧姆滑动电接触：计算研究
DOI：
10.1039/c9nr09662k
复制
发表时间：
2020
期刊：
影响因子：
6.7
通讯作者：
Luo Jianbin
中科院分区：
文献类型：
--
作者：
Song Aisheng;Gao Lei;Zhang Jie;Liu Xiao;Hu Yuan-Zhong;Ma Tian-Bao;Zheng Quanshui;Luo Jianbin
同时实现滑动电接触的低摩擦和良好的导电性是设计高性能微纳米功能器件的关键因素，也是一个巨大的挑战。通过原子模拟，我们提出了一种有效的设计策略，以获得低摩擦和高导电性的滑动电接触。通过在滑动Cu表面之间构建石墨烯（Gr）/MoS 2二维（2D）异质结，与均匀MoS 2润滑的Cu接触相比，可以实现具有显著降低的滑动能垒的超润滑性。此外，通过在MoS 2中引入空位缺陷并用活性金属Ti取代Cu，可以基本上抑制肖特基和隧穿势垒，而不会失去摩擦界面的超润滑特性。因此，在我们提出的Ti-MoS 1.5-Gr-Ti系统中可以实现具有低滑动摩擦的高导电性欧姆接触，这为解决高性能滑动电接触的众所周知的困境提供了潜在的策略。
Simultaneously achieving low friction and fine electrical conductance of sliding electrical contacts is a crucial factor but a great challenge for designing high-performance microscale and nanoscale functional devices. Through atomistic simulations, we propose an effective design strategy to obtain both low friction and high conductivity in sliding electrical contacts. By constructing graphene(Gr)/MoS2 two-dimensional (2D) heterojunctions between sliding Cu surfaces, superlubricity can be achieved with a remarkably lowered sliding energy barrier as compared to that of the homogeneous MoS2 lubricated Cu contact. Moreover, by introducing vacancy defects into MoS2 and substituting Cu with active metal Ti, the Schottky and tunneling barriers can be substantially suppressed without losing the superlubricious properties of the tribointerface. Consequently, a high conductivity ohmic contact with low sliding friction could be realized in our proposed Ti–MoS1.5–Gr–Ti system, which provides a potential strategy for tackling the well-known dilemma for high performance sliding electrical contacts.