1. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, 117603, Singapore
2. Department of Chemistry, National University of Singapore, 3 Science Drive
3, 117543, Singapore
3. Center for Advanced 2D Materials and Graphene Research Centre, 2 Science Drive 2, 117526, Singapore
4. Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore
5. Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore
6. Solar Energy Research Institute of Singapore (SERIS), 7 Engineering Drive 1, 117574, Singapore
7. NUSSNI-NanoCore, National University of Singapore, 117576, Singapore