Real-Time Evaluation of Scattering Strength on Graphene Fet for Selective Sensing of Chemical Vapors

This work uses a real-time evaluation method on graphene field effect transistors (FETs) to characterize the scattering strength of chemical vapors at room temperature. Compared with state-of-art technologies, three distinctive advancements have been achieved: (1) an electrical measurement scheme on graphene FETs to evaluate the scattering strength of chemical vapors by the real-time estimation of carrier concentration and mobility; (2) the demonstration of quantitative test results for three chemical vapors (water, methanol, and ethanol) with different concentrations; and (3) the illustrations of the sensing selectivity in the binary mixture scenarios by the differentiable characteristics of scattering strength. As such, the proposed method of real-time scattering strength evaluation can offer a potential alternative approach for selective gas sensing.