New paradigm in atmospheric gas sensing and molecular identification

Graphene, an atomic-thick sheet of carbon has found immense applications in gas sensors due to its single-molecule sensitivity, low-noise levels, and high carrier density. However, graphene's much-heralded sensitivity also means it is inherently non-selective to any gas. Hence, it easily gets huge p-doping (reduction of graphene electron density) when exposed to atmospheric air which limits demonstrations of its selectivity to only inert environments such as dry air, or nitrogen.