1. Beijing Institute of Nanoenergy and Nanosystems; Chinese Academy of Sciences; National Center for Nanoscience and Technology (NCNST); Beijing 100083 P. R. China
2. Beijing Key Laboratory of Bioelectromagnetism; Institute of Electrical Engineering; Chinese Academy of Sciences; Beijing 100190 P. R. China
3. Beijing Key Laboratory of Bioprocess; College of Life Science and Technology; Beijing University of Chemical Technology; Beijing 100029 P. R. China
4. Laboratory of Controllable Preparation and Application of Nanomaterials; Technical Institute of Physics and Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
5. State Key Laboratory of Crystal Materials; Shandong University; Jinan 250100 P. R. China