1. Division of Physics
and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
2. Energy Research Institute (ERI@N), Interdisciplinary Graduate School, Nanyang Technological University, 637553, Singapore
3. School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
4. CINTRA CNRS/NTU/Thales, UMI3288, 50 Nanyang Drive, 637553, Singapore
5. Department
of Chemistry, Centre for Advanced 2D Materials (CA2DM) and Graphene
Research Centre, National University of Singapore, 3 Science
Drive 3, 117543, Singapore
6. School of Applied Science, Harbin University of Science and Technology, Harbin 150080, China
7. Key Laboratory of Automobile Materials (Jilin University),
Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130012, China