1. Department of Materials Science and Engineering; National University of Singapore; Singapore 117573 Singapore
2. Centre for Advanced 2D Materials and Graphene Research Centre; National University of Singapore; Singapore 117546 Singapore
3. Institute of High Performance Computing; A*STAR; 1 Fusionopolis Way, #16-16 Connexis Singapore 138632 Singapore
4. Department of Mechanical Engineering; National University of Singapore; 9 Engineering Drive 1 Singapore 117576 Singapore