1. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
2. School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3. Nanofabrication Laboratory, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China
4. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China
5. School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
6. Faculty of Information Technology, Beijing University of Technology, Beijing 100124, People’s Republic of China