1. Department of ChemistryNational University of Singapore 3 Science Drive 3 117543 Singapore Singapore
2. Institute of Materials Research and EngineeringA*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis 138634 Singapore Singapore
3. Centre for Advanced 2D Materials and Graphene Research CentreNational University of Singapore 6 Science Drive 2 117546 Singapore Singapore
4. NUSNNI NanocoreNational University of Singapore 117411 Singapore Singapore