| ZHANG Hong-wei,LIU Shuai-lei,ZHANG Ping.Interlayer Friction Regulation of Graphene by In-plane Local Strain Engineering[J],50(3):270-275, 307 |
| Interlayer Friction Regulation of Graphene by In-plane Local Strain Engineering |
| Received:March 08, 2020 Revised:May 28, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.03.028 |
| KeyWord:graphene interlayer friction lateral force local strain molecular dynamics |
| Author | Institution |
| ZHANG Hong-wei |
School of Urban Planning and Municipal Engineering, Xi′an Polytechnic University, Xi′an , China |
| LIU Shuai-lei |
School of Urban Planning and Municipal Engineering, Xi′an Polytechnic University, Xi′an , China |
| ZHANG Ping |
School of Urban Planning and Municipal Engineering, Xi′an Polytechnic University, Xi′an , China |
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| Abstract: |
| The work aims to reveal the influence of the in-plane strain on the interlayer friction behavior of graphene. Based on the model of a hexagonal monolayer graphene slider placed on a supported graphene substrate, the sliding friction of the slider on the substrate with in-plane local tensional strain is studied by molecular dynamics simulation. The work focuses on the variation of the lateral force (i.e., the instantaneous friction force) of the slider with the sliding distance and the interlayer interactions of the flake in the strained region and non-strain region of the substrate. In order to better understand the effect of the local strain on the friction, the interlayer potential energy, contact area, and energy dissipation are investigated. The results demonstrated that when the slider slides in the local strained region of the substrate, the commensurability at the slider-substrate interface is reduced, the interlayer potential energy and the number of contact atoms are decreased. Therefore, the amplitude of the lateral force of the slider in strained region is significantly lower than that in the non-strain region of the substrate. Specifically, when the strain increases from 0 to 10%, the amplitude of the lateral force of the slider in the strain region is reduced by 35% from 1.33 nN to 0.86 nN. By calculating the friction between the slider and the substrate with uniform strain, it is shown that the friction force gradually decreases with increasing strain, and for the sider with the larger load level (or size), the trend of the friction force decreased is more obvious. It concludes that the local strain can effectively modulate the distribution of friction and reduce the friction between graphene layers. |
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