1. School of Materials
2. Sun Yat-sen University
3. Guangzhou 510275
4. China
5. Department of Electronic Engineering
6. Department of Biomedical Engineering
7. University of Kentucky
8. Lexington
9. USA
10. Shenyang National Laboratory for Materials Science
11. Institute of Metal Research
12. Chinese Academy of Sciences
13. Shenyang 110016
14. The Chinese University of Hong Kong
15. School of Materials Science and Engineering
16. Georgia Institute of Technology