1. National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
2. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
4. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Nanjing Tech University, Nanjing, 211816, China
5. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
6. College of Physical Science and Technology, Sichuan University, Chengdu, 610064, China
7. Department of Chemistry and Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117549, Singapore