1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Institute of Textiles and Clothing, Hong Kong Polytechnic University, Hong Kong 999077, Hong Kong
4. College of Materials, Northwestern Polytechnical University, 127 West Youyi Road, Xian 710072, China