1. Key Laboratory of Molecular Medicine and Biotherapy, School of Life Sciences, Beijing Institute of Technology, Beijing 100811, P. R. China
2. School of Science, Westlake Institute for Advanced Study, Westlake University, 18 Shilongshan Road, Hangzhou 310024, P. R. China
3. Department of Physics, Fudan University, Shanghai 200438, P. R. China
4. Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, 243 University Road, Shantou, Guangdong 515063, P. R. China
5. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, P. R. China
6. Joint Laboratory of Nano-organic Functional Materials and Devices (TIPC and CityU), City University of Hong Kong, Kowloon, Hong Kong SAR, P. R. China
7. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China