1. Institute of Electronics
2. Microelectronics and Nanotechnology (IEMN)
3. CNRS
4. Université de Lille
5. F-59652 cedex, Villeneuve d'Ascq
6. Department of Chemistry
7. National University of Singapore
8. 117543 Singapore
9. Singapore
10. Centre for Advanced 2D Materials and Graphene Research Centre