1. Centre for Advanced 2D Materials and Graphene
Research Centre, National University of Singapore, 6 Science
Drive 2, Singapore, 117546
2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
3. Department of Biology and Chemistry, Justus-Liebig-University Giessen, Heinrich-Buff-Ring
17-19, 35392 Giessen, Germany
4. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542
5. Department of Biomedical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575