1. Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
2. Graduate School of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3. Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China
4. Department of Advanced Materials and Nanotechnology College of Engineering, Peking University, Beijing 100871, People's Republic of China
5. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China