A hillock-like phenomenon with low friction and adhesion on a graphene surface induced by relative sliding at the interface of graphene and the SiO(2) substrate using an AFM tip.
A hillock-like phenomenon with low friction and adhesion on a graphene surface induced by relative sliding at the interface of graphene and the SiO(2) substrate using an AFM tip.
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使用 AFM 尖端在石墨烯和 SiO2 基底界面上相对滑动引起的石墨烯表面上具有低摩擦力和粘附力的小丘状现象
DOI：
10.1039/c9na00660e
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发表时间：
2020-06-17
影响因子：
4.7
通讯作者：
中科院分区：
文献类型：
--
作者：
石墨烯作为工业滑动界面的原子级稀薄固体润滑剂具有很高的潜力。然而，石墨烯作为涂层材料并不总是对任何基材表现出很强的附着力。当石墨烯与其基材的粘附力减弱时，界面处是否存在相对滑动以及石墨烯涂层的摩擦学性能如何变化仍不清楚。在这项工作中，我们首先设计了一种削弱石墨烯与其SiO2基底之间的粘附力的方法。然后用 AFM 尖端摩擦与基底粘附力减弱的石墨烯，我们发现了一个新的现象：单层石墨烯不仅不再保护 SiO2 基底免受变形和损坏，而且还促使形成高度约为数十纳米的小丘状结构。此外，小丘状结构的表面表现出非常低的粘附力和随着滑动时间不断减小的摩擦力。通过比较裸露 SiO2 表面上的小丘状结构和所提出的力模型，我们证明了小丘状结构（具有非常低的粘附力和不断减小的摩擦力）的出现归因于 AFM 尖端的机械剪切引起的石墨烯/基底界面处的相对滑动。我们的研究结果揭示了当石墨烯与其基底之间的粘附强度受损或减弱时石墨烯涂层的潜在失效，并为在 SiO2/石墨烯表面上原位制造低摩擦和粘附微/纳米结构提供了可能性。
Graphene demonstrates high potential as an atomically thin solid lubricant for sliding interfaces in industry. However, graphene as a coating material does not always exhibit strong adhesion to any substrates. When the adhesion of graphene to its substrate weakens, it remains unknown whether relative sliding at the interface exists and how the tribological properties of the graphene coating changes. In this work, we first designed a method to weaken the adhesion between graphene and its SiO2 substrate. Then the graphene with weakened adhesion to its substrate was rubbed using an AFM tip, where we found a novel phenomenon: the monolayer graphene not only no longer protected the SiO2 substrate from deformation and damage, but also prompted the formation of hillock-like structures with heights of approximately tens of nanometers. Moreover, the surface of the hillock-like structure exhibited very low adhesion and a continuously decreasing friction force versus sliding time. Comparing the hillock-like structure on the bare SiO2 surface and the proposed force model, we demonstrated that the emergence of the hillock-like structure (with very low adhesion and continuously decreasing friction) was ascribed to the relative sliding at the graphene/substrate interface caused by the mechanical shear of the AFM tip. Our findings reveal a potential failure of the graphene coating when the adhesion strength between graphene and its substrate is damaged or weakened and provide a possibility for in situ fabrication of a low friction and adhesion micro/nanostructure on a SiO2/graphene surface.
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影响因子：
10.9
作者：
Das, Santanu;Lahiri, Debrupa;Choi, Wonbong
通讯作者：
Choi, Wonbong
影响因子：
3.2
作者：
Lu, Zhixing;Dunn, Martin L.
通讯作者：
Dunn, Martin L.
二维材料在液相润滑系统中的应用研究进展
DOI：
10.3390/ma11081314
发表时间：
2018-07-30
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Liu L;Zhou M;Li X;Jin L;Su G;Mo Y;Li L;Zhu H;Tian Y
通讯作者：
Tian Y
影响因子：
4.6
作者：
Chen JJ;Meng J;Yu DP;Liao ZM
通讯作者：
Liao ZM
影响因子：
3.7
作者：
Sabio, J.;Seoanez, C.;Sols, F.
通讯作者：
Sols, F.