微纳系统运动部件除了需要解决粘着、摩擦和磨损等问题，还面临启停过程中的变速冲击，如何减小微纳器件在启停过程中的变速冲击，是保证润滑薄膜长时间稳定性与高可靠性的重要因素。基于石墨烯优异的力学及超滑特性，若将石墨烯引入到微纳器件表面，可获得低摩擦和高抗磨性能，同时有望成为高承载的润滑薄膜。如果在石墨烯薄膜中引入柔性结构，在摩擦过程中，变速冲击能量可被柔性层屈服吸收，从而减小微纳器件在启停过程中对石墨烯润滑薄膜的冲击损伤。本项目旨在通过“氧化石墨烯-有机分子-石墨烯”柔性结构石墨烯润滑薄膜的可控制备，研究柔性结构石墨烯薄膜在启停变速条件下的摩擦学特性及耐变速冲击行为；探讨柔性结构对石墨烯薄膜摩擦学行为的影响机制；阐明柔性结构与石墨烯复合薄膜耐变速冲击行为的相关性；揭示柔性结构石墨烯薄膜变速冲击条件下的低摩擦机制；在此基础上发展低摩擦、耐变速冲击、长寿命的柔性结构石墨烯润滑薄膜。

Reducing adhesion, friction and wear between moving components in micro-/nano-devices is an important issue that must be solved. In addition, impact of variable speed has become one of the main reasons to shorten the service life of micro-/nano-devices. How to decrease the impact of variable speed in on-off process is a critical factor to prolong the service life of micro-/nano-devices. Graphene, with outstanding mechanical properties and super-lubrication, has attracted tremendous attention. As a lubrication film, graphene film could provide low friction, excellent load-carrying capacity and anti-wear properties. If a flexible structure was introduced to graphene film, the impact energy of variable speed could be absorbed by the section with flexible structure. Accordingly, we proposed here for creating a series of "graphene oxide-organic molecule-graphene" films with flexible structure. The tribological behaviors and the impact resistance of the graphene film with flexible structure in on-off process will be studied. The influence mechanism of the flexible structure on the friction behaviors of graphene composite films will be evaluated. The relationship between the flexible structure and the impact resistance behaviors of graphene composite films will be investigated. The low friction mechanism of the graphene film with flexible structure under the impact of variable speed will be discussed. On this basis, a series of flexible-structure graphene lubrication films with low friction, excellent impact resistance and reliable service life will be designed and prepared.