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Effect of structure on the tribology of ultrathin graphene and graphene oxide films

机译：结构对超薄石墨烯和氧化石墨烯薄膜摩擦学的影响

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摘要

The friction and wear properties of graphene and graphene oxide (GO) with varying C/O ratio were investigated using friction force microscopy. When applied as solid lubricants between a sliding contact of a silicon (Si) tip and a SiO2/Si substrate, graphene and ultrathin GO films (as thin as 1-2 atomic layers) were found to reduce friction by similar to 6 times and similar to 2 times respectively as compared to the unlubricated contact. The differences in measured friction were attributed to different interfacial shear strengths. Ultrathin films of GO with a low C/O ratio of similar to 2 were found to wear easily under small normal load. The onset of wear, and the location of wear initiation, is attributed to differences in the local shear strength of the sliding interface as a result of the nonhomogeneous surface structure of GO. While the exhibited low friction of GO as compared to SiO2 makes it an economically viable coating for microano-electro-mechanical systems with the potential to extend the lifetime of devices, its higher propensity for wear may limit its usefulness. To address this limitation, the wear resistance of GO samples with a higher C/O ratio (similar to 4) was also studied. The higher C/O ratio GO was found to exhibit much improved wear resistance which approached that of the graphene samples. This demonstrates the potential of tailoring the structure of GO to achieve graphene-like tribological properties.
机译：使用摩擦力显微镜研究了不同C / O比的石墨烯和氧化石墨烯（GO）的摩擦磨损性能。当在硅（Si）尖端和SiO2 / Si基底的滑动接触之间用作固体润滑剂时，发现石墨烯和超薄GO膜（薄至1-2个原子层）将摩擦降低了6倍左右相较于未润滑的触点，分别降低了两倍。测得的摩擦力的差异归因于不同的界面剪切强度。发现具有低的C / O比（类似于2）的GO超薄膜在很小的法向载荷下很容易磨损。磨损的发生和磨损的开始位置归因于GO界面结构不均匀而导致的滑动界面局部剪切强度的差异。尽管与SiO2相比，GO表现出的低摩擦性能使其成为用于微/纳米机电系统的经济可行的涂层，并具有延长器件寿命的潜力，但其较高的磨损倾向可能会限制其用途。为了解决这个限制，还研究了具有较高C / O比（类似于4）的GO样品的耐磨性。发现较高的C / O比GO显示出大大改善的耐磨性，其接近石墨烯样品的耐磨性。这证明了调整GO结构以获得类似石墨烯的摩擦学性能的潜力。

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