Macroscale superlubricity of Si-doped diamond-like carbon film enabled by graphene oxide as additives
Macroscale superlubricity of Si-doped diamond-like carbon film enabled by graphene oxide as additives
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以氧化石墨烯为添加剂实现硅掺杂类金刚石碳膜的宏观超润滑
DOI：
10.1016/j.carbon.2021.01.147
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发表时间：
2021-02-11
期刊：
影响因子：
10.9
通讯作者：
Luo, Jianbin
中科院分区：
文献类型：
--
作者：
Yi, Shuang;Chen, Xinchun;Luo, Jianbin
碳基材料包括类金刚石碳（DLC）和石墨烯，由于其特殊的结构和层间相互作用的弱点，已被证明是非凡的润滑材料。在这项工作中，通过在乙二醇中添加氧化石墨烯（GO）纳米片的润滑，在掺硅的氢化非晶碳（a-C:H:Si）薄膜上实现了极限摩擦系数（COF = 0.002）。在Si3N4表面和aC:H:Si膜上发生摩擦化学反应，导致Si3N4和a-C:H:Si表面均形成二氧化硅胶体层。同时，氧化石墨烯纳米片在摩擦表面的物理吸附使得剪切面从Si3N4/a- c:H:Si界面转移到GO/GO界面，从而进一步降低了剪应力。建立了a-C:H:Si和GO纳米片协同润滑的机理和模型，揭示了宏观超润滑的设计原理。(C) 2021 Elsevier Ltd版权所有。
Carbon-based materials including diamond-like carbon (DLC) and graphene have been demonstrated as extraordinary lubricating materials due to its specific structure and weakness of the interlayer interactions. In this work, the extreme coefficient of friction (COF = 0.002) was achieved on the silicondoped hydrogenated amorphous carbon (a-C:H:Si) film by lubrication with graphene oxide (GO) nanosheets as additives in ethylene glycol. The tribochemical reactions occurred on the Si3N4 surface and aC:H:Si film, leading to the formation of the silica colloid layer on both Si3N4 and a-C:H:Si surfaces. In the meantime, the physical adsorption of GO nanosheets on the friction surfaces makes the shear plane transfer from Si3N4/a-C:H:Si interface to GO/GO interface, which results in a further reduction of shear stress. The mechanism and modelling of a-C:H:Si and GO nanosheets synergistic lubrication effect was finally established to reveal the design principle of superlubricity at macroscale. (C) 2021 Elsevier Ltd. All rights reserved.