1. Centre
for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543
2. Department
of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551
3. Centre
for Advanced 2D Materials, National University of Singapore, 6 Science
Drive 2, Singapore 117546
4. Division
of Materials Science, Nanyang Technological University, 50 Nanyang
Avenue, Singapore 639798
5. NanoCore, National University of Singapore, 4 Engineering
Drive 3, Singapore 117576