1. College of Science
2. Civil Aviation University of China
3. Tianjin 300300
4. China
5. School of Electronics and Information Engineering
6. Tianjin Polytechnics University
7. Tianjin 300160
8. Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures
9. Nanjing University
10. Nanjing 210093
11. Department of Materials Science and Metallurgy