1. College of Chemistry
and Chemical Engineering, Chongqing University, Chongqing 400044, China
2. College of Physics, Chongqing University, Chongqing 400044, China
3. State Key
Laboratory Cultivation Base for Nonmetal Composites and Functional
Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China