Graphene & 2D Systems Research @ IIT Madras: Highlights

Research Theme-3: Interfacial phenomena in 2D systems

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* Graphene: Electrolyte Interfaces - Electrolytic gating has helped determine the electronic and vibrational properties of graphene, in particular about the quantum capacitance associated with this low dimensional material. On the other hand, we use graphene as a platform to explore complex electrolytes with large ionic valence and large size, where the interfacial arrangement of ions is not easy to predict. For details refer our 2018 publication, Lijin George et al 2018 Phys. Chem. Chem. Phys. DOI: 10.1039/C8CP02307G

* Graphene as an atomically-thin thermal and electrochemical barrier - Despite being atomically thin, graphene can serve as an effective gas permeation barrier. Graphene has also been proposed as a thermal oxidation barrier for metals and other surfaces. In this work, we look at the basic physics of how graphene itself is deformed during the surface oxidation of the metal. We explore the hotspots of oxidation in graphene-coated metals and identify the microscopic process of graphene deformation during metal oxidation. See our publications, Lijin George et al 2015 Nanotechnology 26 495701 (for graphene / copper) and Lijin George et al 2016 Mater. Res. Express 3 115016 (for graphene / nickel). We have also studied the ability of graphene to serve as an electrochemical barrier (Vasumathy Ravishankar et al 2018 AIP Conference Proceedings 1942 080059)

* Van der Waals Heterostructures - We combine single-layer graphene with molybdenum disulphide and study how charges distribute in this nanoscale heterostructure when doped with an organic acceptor molecule. Read details in Lijin George et al 2016 Physica Status Solidi: B 254 1600521. A preliminary work focused on organic doping of twisted bilayer graphene, Lijin George et al 2016 AIP Conference Proceedings 1728 020319

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