1. Laboratory of Low-dimensional Carbon Materials, Department of Physics, Shaoxing University, Shaoxing 312000, China
2. Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore
3. Departments of Chemical & Petroleum Engineering, University of Wyoming, Laramie, Wyoming, 82071, USA
4. Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Physics and Atmospheric Sciences, Jackson State University, Jackson, MS, USA
5. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China