1. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
2. Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 1176033, Singapore
3. CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, Singapore 637553, Singapore
4. School of Electrical and Electronics Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
5. Energy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, Singapore
6. NUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, Singapore 117456, Singapore
7. Photon Science Division, Swiss Light Source, Paul Scherrer Institute, Forschungsstrasse 111, CH-5232, Villigen PSI, Switzerland
8. Centre for Advanced 2D Materials, National University of Singapore, Block S14, Level 6, 6 Science Drive 2, Singapore 117546, Singapore
9. NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore