1. National Center for Nanoscience and Technology (NCNST), Beijing 100190,
P. R. China
2. College of
Science, Beijing Forestry University, Beijing
100083, P. R.
China
3. Institute of High Energy
Physics, The Chinese Academy of Sciences, CAS Key Lab for Biomedical
Effects of Nanomaterials and Nanosafety, Beijing, 100049, P. R. China
4. Department School of Materials
Science and Engineering, Tianjin Key Laboratory of Composite and Functional
Materials, Tianjin University, Tianjin
300072, P. R. China