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首页> 外文期刊>ACS applied materials & interfaces >Mussel-Inspired Graphene Film with Enhanced Durability as a Macroscale Solid Lubricant
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Mussel-Inspired Graphene Film with Enhanced Durability as a Macroscale Solid Lubricant

机译：贻贝启发的石墨烯薄膜，具有增强的耐久性，作为Macroscale固体润滑剂

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摘要

Graphene has exhibited massive potential as a macroscale solid lubricant, but its durability is limited due to the weak adhesion between graphene sheets and the substrate. Here, inspired by mussel adhesive protein (MAP), effective reinforcement of the graphene-substrate interaction to attain remarkable enhancement on the durability of the graphene film is presented. The mussel-inspired graphene (mGr) film exhibits a coefficient of friction stabilizing at 0.16 up to 490000 sliding cycles in the friction testing against the silicon nitride ball; in the identical sliding condition, comparatively, the graphene (Gr) film without MAP only lasts 4300 sliding cycles. The analysis of Raman and ATR-FTIR demonstrates that, on the one hand, the MAP film firmly adsorbs onto the substrate via forming metal-catechol coordination bonds with metal atoms; on the other hand, it establishes strong interactions with graphene sheets by hydrogen bonding as well as the pi-pi overlap. As an interlayer, MAP retains graphene sheets within the contact interface in the form of a compact tribo-layer, which results in an over 2 orders of magnitude enhancement of durability for the mGr film. This strategy of improving the graphene-substrate adhesion via MAP offers an avenue for the development of effective and reliable graphene-based solid lubricants for engineering applications.
机译：石墨烯已经表现出宏观固体润滑剂的巨大电位，但由于石墨烯片和基材之间的粘附性较弱，其耐久性受到限制。这里，通过贻贝粘合剂蛋白（MAP）的启发，提出了有效增强石墨烯 - 底物相互作用以获得显着提高的石墨烯薄膜的耐久性。贻贝鼓励的石墨烯（MGR）膜在氮化硅球的摩擦试验中显示出0.16至490000滑动循环的摩擦稳定系数;在相同的滑动条件下，比较，没有图的石墨烯（GR）膜仅持续4300滑动循环。拉曼和ATR-FTIR的分析表明，一方面，地图膜通过形成金属原子的金属 - 儿茶酚协调键牢固地吸附到基材上;另一方面，它通过氢键和PI-PI重叠建立与石墨烯片的强相互作用。作为中间层，地图以紧凑的摩擦层的形式保留在接触界面内的石墨烯片，这导致MGR膜的耐久性的超过2个峰值。通过地图改善石墨烯基板粘附的策略为用于工程应用的有效和可靠的石墨烯的固体润滑剂提供了一种开发的途径。

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