1. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices
2. Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology
3. Soochow University
4. Suzhou Jiangsu 215123, P. R. China
5. Physikalisches Institut
6. Institute of Applied Physics (IAP)
7. Justus-Liebig-Universität Giessen
8. Germany
9. School of Materials Science and Engineering
10. Nanyang Technological University
11. Singapore 639798, Singapore