1. Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
2. School of Materials Science & Engineering and Hubei Key Laboratory of Polymer Materials
3. Hubei University
4. Wuhan 430062
5. People's Republic of China
6. Center for Nanoscale Characterization & Devices (CNCD)
7. School of Physics & Wuhan National Laboratory for Optoelectronics (WNLO)
8. Huazhong University of Science and Technology (HUST)
9. Wuhan 430074
10. P. R. China