Macroscale Ultradurable Antiwear Achieved on Graphene-Based Films via Multiphase Combination

Excellent antiwear performance, high bearing capacity, and long service life are essential prerequisites for the reliability and durability of Si-based micro/nanodevice operation. To improve the antiwear property and prolong service life of Si-based micro-/nanodevices under high loads, graphene oxide (GO) nanosheets, graphene quantum dots (GQDs), and ionic liquid-capped GQDs (IL-GQDs) are used to create three kinds of multilayer films as solid lubricants, that is, single-component (GO) 5 , (GO/GQDs) 5 , and (GO/IL-GQDs) 5 multilayer films. The results show that (GO/IL-GQDs) 5 composite multilayer possesses excellent wear resistance under a high load of 4 N with the wear rate of 4.9 × 10 −7 mm 3 N −1 m −1 . The superior antiwear performance of (GO/IL-GQDs) 5 composite film is mainly due to the unique 3D structure composed of GO nanosheets alternating with IL-GQDs. The rigid GO nanosheets play a role in load-carrying capacity, and the IL-GQDs could delay the time of structure transformation and reduce the loss rate of transfer film, thereby effectively extending the service life of (GO/IL-GQDs) 5 composite multilayer. Such multilayers are expected to be good solid lubricating films suitable for Si-based micro-/nanodevices.