Graphene–Graphene Interactions: Friction, Superlubricity, and Exfoliation,Advanced Materials

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Graphene–Graphene Interactions: Friction, Superlubricity, and Exfoliation
Advanced Materials ( IF 27.4 ) Pub Date : 2018-02-13 , DOI: 10.1002/adma.201705791
Robert C. Sinclair ₁ , James L. Suter ₁ , Peter V. Coveney ₁

Affiliation

Graphite's lubricating properties due to the “weak” interactions between individual layers have long been known. However, these interactions are not weak enough to allow graphite to readily exfoliate into graphene on a large scale. Separating graphite layers down to a single sheet is an intense area of research as scientists attempt to utilize graphene's superlative properties. The exfoliation and processing of layered materials is governed by the friction between layers. Friction on the macroscale can be intuitively understood, but there is little understanding of the mechanisms involved in nanolayered materials. Using molecular dynamics and a new forcefield, graphene's unusual behavior in a superlubric state is examined, and the energy dissipated between two such surfaces sliding past each other is shown. The dependence of friction on temperature and surface roughness is described, and agreement with experiment is reported. The accuracy of the simulated behavior enables the processes that drive exfoliation of graphite into individual graphene sheets to be described. Taking into account the friction between layers, a peeling mechanism of exfoliation is predicted to be of lower energy cost than shearing.

中文翻译：

石墨烯与石墨烯的相互作用：摩擦，超润滑和剥落

由于各个层之间的“弱”相互作用，石墨的润滑性能早已为人所知。但是，这些相互作用不足以使石墨容易大规模地剥落成石墨烯。随着科学家试图利用石墨烯的最高级特性，将石墨层分离成单张薄片是一个密集的研究领域。层状材料的剥落和加工取决于层之间的摩擦力。可以直观地理解宏观上的摩擦，但对纳米层材料所涉及的机理了解甚少。使用分子动力学和新的力场，研究了石墨烯在超润滑状态下的异常行为，并显示了在两个这样的彼此滑过的表面之间耗散的能量。描述了摩擦对温度和表面粗糙度的依赖性，并报道了与实验的一致性。模拟行为的准确性使得能够描述将石墨剥落成单个石墨烯片的过程。考虑到层之间的摩擦，剥落的剥离机理预计比剪切的能耗更低。

更新日期：2018-02-13

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