1. Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University
2. Chongqing 401331
3. P. R. China
4. School of Material Science and Engineering, Guilin University of Electronic Technology
5. Guilin 541004
6. Analytical and Testing Center of Chongqing University
7. Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
8. Beijing 100124