张红卫,刘帅磊,张苹.石墨烯层间摩擦的面内局部应变调控[J].表面技术,2021,50(3):270-275, 307.
ZHANG Hong-wei,LIU Shuai-lei,ZHANG Ping.Interlayer Friction Regulation of Graphene by In-plane Local Strain Engineering[J].Surface Technology,2021,50(3):270-275, 307 |
| 石墨烯层间摩擦的面内局部应变调控 |
| Interlayer Friction Regulation of Graphene by In-plane Local Strain Engineering |
| 投稿时间：2020-03-08 修订日期：2020-05-28 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.03.028 |
| 中文关键词: 石墨烯 层间摩擦 侧向力 局部应变 分子动力学 |
| 英文关键词:graphene interlayer friction lateral force local strain molecular dynamics |
| 基金项目:国家自然科学基金(11602139);国家级大学生创新创业训练计划项目(201910709037) |
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| 中文摘要: |
| 目的 揭示面内应变对石墨烯层间摩擦行为的影响。方法 利用分子动力学模拟方法，基于支撑的石墨烯基底与单层六边形石墨烯滑片接触模型，重点考察滑片在加载面内局部拉伸应变的基底表面的滑动摩擦过程。着重分析滑片所受侧向力(即瞬时摩擦力)随滑动距离的变化规律，计算滑片分别与基底的加载应变区和非应变区的层间作用，通过计算层间作用势能、接触原子数、能量耗散等，直观揭示应变对摩擦的影响机制。结果 当滑片在基底的局部应变加载区域滑动接触时，由于滑片与基底界面公度性和层间势能降低，接触原子数减少，导致滑片所受侧向力的振幅比其在基底的非应变区滑动时明显降低。具体来讲，当应变由0增加至10%，处于应变区的滑片所受侧向力由1.33 nN减小至0.86 nN，降幅达35%。通过计算加载均匀应变的基底与滑片层间的摩擦力，表明摩擦力随应变的增加而逐渐减小，且载荷越高、滑片尺寸越大时，摩擦力降幅越明显。结论 局部应变可以有效调控摩擦的分布规律，降低石墨烯层间摩擦力大小。 |
| 英文摘要: |
| 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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