1. National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering
2. College of Engineering and Applied Science & Collaborative Innovation Center of Advanced Microstructures
3. Nanjing University
4. Nanjing 210093
5. P. R. China
6. School of Materials Science and Engineering
7. Nanjing University of Science and Technology
8. Nanjing
9. China
10. School of Chemical and Environmental Engineering
11. Harbin University of Science and Technology
12. Harbin 150040