Carrier motion effect on bilayer graphene nanoribbon base biosensor model

Abstract

Graphene nanoribbon (GNR) because of its unique electrical properties has been employed in many applications, such as batteries, energy storage devices and biosensors. In this paper modelling of bilayer graphene nanoribbon (BGNR) sensor is in our focus. Based on the presented model BGNR quantum capacitance variation effect by the PSA injected electrons in to the FET channel as a sensing mechanism is considered. Also carrier movement in BGNR as another modelling parameter is suggested. In this paper prostate specific antigen (PSA) adsorption and local pH value by injected carriers on the surface of bilayer BGNR is modelled. Carrier concentration as a function of control parameters (f, p) is predicted. Finally comparison study are illustrated which indicates good agreement between proposed model and experimental data. We are concluded that the current variation on the biosensor is controlled by PSA concentration and local pH values.