1. School of Physics and Electronic Engineering
2. Xinyang Normal University
3. Xinyang 464000
4. P. R. China
5. Key Laboratory of Advanced Micro/Nano Functional Materials
6. College of Chemistry and Chemical Engineering
7. Luoyang Normal University
8. Luoyang 471022
9. Department of Mechanical and Aerospace Engineering
10. The Hong Kong University of Science and Technology
11. Hong Kong