Macroscale Superlubricity Enabled by Graphene‐Coated Surfaces

• Published in: Advanced science 2020-02, Vol.7 (4), p.1903239-n/a
• Main Authors: Zhang, Zhenyu, Du, Yuefeng, Huang, Siling, Meng, Fanning, Chen, Leilei, Xie, Wenxiang, Chang, Keke, Zhang, Chenhui, Lu, Yao, Lin, Cheng‐Te, Li, Suzhi, Parkin, Ivan P., Guo, Dongming
• Format: Article
• Language: English
• Subjects: ambient conditions; Carbon; Chemical vapor deposition; Friction; Graphene; Graphite; Load; macroscale superlubricity; macroscale surfaces; molecular dynamics; Scanning electron microscopy; Solid lubricants
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.201903239

Friction and wear remain the primary modes for energy dissipation in moving mechanical components. Superlubricity is highly desirable for energy saving and environmental benefits. Macroscale superlubricity was previously performed under special environments or on curved nanoscale surfaces. Nevertheless, macroscale superlubricity has not yet been demonstrated under ambient conditions on macroscale surfaces, except in humid air produced by purging water vapor into a tribometer chamber. In this study, a tribological system is fabricated using a graphene‐coated plate (GCP), graphene‐coated microsphere (GCS), and graphene‐coated ball (GCB). The friction coefficient of 0.006 is achieved in air under 35 mN at a sliding speed of 0.2 mm s−1 for 1200 s in the developed GCB/GCS/GCP system. To the best of the knowledge, for the first time, macroscale superlubricity on macroscale surfaces under ambient conditions is reported. The mechanism of macroscale superlubricity is due to the combination of exfoliated graphene flakes and the swinging and sliding of the GCS, which is demonstrated by the experimental measurements, ab initio, and molecular dynamics simulations. These findings help to bridge macroscale superlubricity to real world applications, potentially dramatically contributing to energy savings and reducing the emission of carbon dioxide to the environment. A tribological system is developed using a graphene‐coated ball, graphene‐coated microspheres, and a graphene‐coated plate. Macroscale superlubricity is realized using the developed system on macroscale surfaces under ambient conditions. The fundamental mechanisms of macroscale superlubricity are elucidated by ab initio and molecular dynamics simulations.