1. College of Material Science and Technology
2. Nanjing University of Aeronautics and Astronautics
3. Nanjing 210016
4. P. R. China
5. School of Materials Sciences and Engineering
6. School of Materials Science and Engineering
7. Jiangsu University of Science and Technology
8. Zhenjiang
9. China
10. Nanyang Technological University
11. Singapore 639798
12. Singapore
13. Laboratory of Solid State Microstructures
14. Nanjing University
15. Nanjing 210093