Currently, there is an enormous demand for the development of high performance gas sensors for environmental pollution monitoring. Hence, there is a constant quest to replace traditional metal oxide nanostructures as gas sensing materials due to the challenges associated with high temperature working condition. Carbon nanomaterials, particularly graphene because of its unique properties have recently attracted a great deal of interests for gas sensing applications. Abundant defects and functional groups on reduced graphene oxide (rGO), a derivative of graphene, not only facilitate gas adsorption but also provide the ease of selective functionalization with specific organic and inorganic groups for achieving selectivity. The interfacial interactions at the junctions of rGO and nanostructures support the modulation of electronic properties, making the graphene hybrid highly responsive to external chemical perturbations.
Moreover, atomic scale interaction of molecules with the graphene that could lead to an advanced applications such as molecular memory switches. The combined role of modified interfaces though gate control leads to a much responsive gas sensing characteristics that leads to its molecular memory operation.