1. Institute of Advanced Materials and Technology
2. University of Science and Technology Beijing
3. 100083 Beijing
4. China
5. Department of Applied Physics
6. Hong Kong Polytechnic University
7. Hong Kong
8. Department of Chemistry
9. Tsinghua University
10. Beijing 100084
11. Tsinghua-Tongfang Functional Ceramics Joint Laboratory
12. Tongfang Co., Ltd
13. Beijing 100083