A versatile gas sensor with selectivity using a single graphene transistor

This work reports the technique to selectively sense different gases using a single graphene field effect transistor (FET) by measuring real time conductance as a function of gate voltage. Compare to the state-of-art, three distinctive advancements have been achieved: (1) first demonstration of selective gas sensing (NO₂, NH₃, H₂O and CH₃OH) using a single graphene FET; (2) experimental proof of linear dependence between the reciprocal of carrier mobility limited by long-range scattering and the Dirac Point voltage upon gas molecule exposure; (3) utilizations of such linear characteristic for selective gas sensing. As such, the proposed sensing scheme and results could open up a new class of graphene-based, selective gas sensing devices for practical uses as well as fundamental scientific research.