1. School of Materials Science and Engineering
2. Jiangsu University
3. Zhenjiang 212013
4. P. R. China
5. The Atomic, Molecular & Materials Physics Group
6. School of Science
7. Nanjing University of Science and Technology
8. Nanjing 210094
9. Herbert Gleiter Institute of Nanoscience
10. Future Energy Laboratory
11. Hefei University of Technology
12. Hefei 230009