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首页> 外文期刊>Physica status solidi, B. Basic research >Substrate effect on thicknessdependent friction on graphene
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Substrate effect on thicknessdependent friction on graphene

机译：衬底对石墨烯厚度依赖性摩擦的影响

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摘要

Using friction force microscopy, we have investigated the frictional behavior of graphene deposited on various substrates as well as over micro-fabricated wells. Both graphene on SiO_2/ Si substrates and graphene freely suspended over the wells showed a trend of increasing friction with decreasing number of atomic layers of graphene. However, this trend with thickness was absent for graphene deposited on mica, where the graphene is strongly bonded to the substrate. Measurements together with a mechanics model suggest that mechanical confinement to the substrate plays an important role in the frictional behavior of these atomically thin graphite sheets. Loosely bound or suspended graphene sheets can pucker in the out-of-plane direction due to tip-graphene adhesion. This increases contact area, and also allows further deformation of the graphene when sliding, leading to higher friction. Since thinner samples have lower bending stiffness, the puckering effect and frictional resistance are greater. However, if the graphene is strongly bound to the substrate, the puckering effect will be suppressed and no thickness dependence should be observed. The results can provide potentially useful guidelines in the rational design and use of graphene for nano-mechanical applications, including nano-lubricants and components in micro- and nanodevices.
机译：使用摩擦力显微镜，我们研究了沉积在各种基材以及微加工孔上的石墨烯的摩擦行为。 SiO_2 / Si衬底上的石墨烯和自由悬浮在阱上的石墨烯都显示出随着石墨烯原子层数减少而增加摩擦的趋势。但是，沉积在云母上的石墨烯不存在厚度随厚度变化的趋势，因为石墨烯在石墨烯上牢固地结合在基板上。测量和力学模型表明，机械限制在基板上对这些原子薄的石墨片的摩擦行为起着重要作用。松散结合或悬浮的石墨烯片会由于尖端石墨烯的粘附而在面外方向上起皱。这增加了接触面积，并且还允许石墨烯在滑动时进一步变形，从而导致更高的摩擦。由于较薄的样品具有较低的弯曲刚度，因此起皱效果和摩擦阻力更大。但是，如果石墨烯牢固地结合到基底，则起皱作用将受到抑制，并且不应观察到厚度依赖性。该结果可为石墨烯在纳米机械应用中的合理设计和使用提供潜在的有用指导，包括纳米润滑剂以及微和纳米设备中的组件。

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