1. School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Key Laboratory of Thin Film and Microfabrication Technology, Shanghai JiaoTong University, Shanghai 200240 , China
2. Lubricating Materials Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210 , China
3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039 , PR China