1. Institute of Nanoscience and Nanotechnology
2. Lanzhou University
3. Gansu 730000
4. China
5. School of Advanced Materials and Nanotechnology
6. Xidian University
7. State Key Laboratory of Solid Lubrication
8. Lanzhou Institute of Chemical Physics
9. Chinese Academy of Sciences
10. Lanzhou
11. College of Naval Architecture and Ocean Engineering
12. Naval University of Engineering
13. Wuhan 430033