1. Institute of Coal Chemistry
2. Chinese Academy of Sciences
3. Taiyuan 030001
4. China
5. University of Chinese Academy of Sciences
6. Key Laboratory of Applied Surface & Colloid Chemistry of Ministry of Education
7. Shaanxi Normal University
8. Shaanxi 710119
9. State Key Laboratory of Transient Optics and Photonics
10. Xi'an Institute of Optics and Precision Mechanics