1. CAS Center for Excellence in NanoscienceCAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology (NCNST) No. 11 Beiyitiao Zhongguancun Beijing 100190 China
2. Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Beijing 100049 China
3. Sino-Danish CenterUniversity of Chinese Academy of Science (UCAS) No.19A Yuquan Road Beijing 100049 China
4. Institute of High Energy PhysicsChinese Academy of Science (CAS) No.19A Yuquan Road Beijing 100049 China