1. Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, United States
2. Department of Physics, National University of Singapore, 2 Science Drive 3, 117551, Singapore
3. Department of Materials Science and Engineering, 2D Crystal Consortium, Materials Innovation Platform, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
4. Laboratoire Charles Coulomb (L2C), Université de Montpellier, CNRS, 34095 Montpellier, France
5. Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, United States
6. Centre for Advanced 2D Materials National University of Singapore, 6 Science Drive 2, 117546, Singapore
7. Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore