1. Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu 215123 P. R. China
2. Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou 215123, Jiangsu P. R. China
3. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow University 199 Ren-Ai Road, Suzhou Industrial Park Suzhou Jiangsu 215123 P. R. China
4. School of Materials Science and Engineering Nankai University Tianjin 300350 P. R. China
5. Department of Physics University of Yangon Pyay Road Yangon 11181 Myanmar