▎ 摘　　要

NOVELTY - A graphene-based field-effect transistor biosensor comprises a substrate and a channel layer that is arranged on the substrate, where the channel layer is provided with a functionalized graphene layer, the graphene layer is provided with a source electrode and a drain electrode, a surface of the functionalized graphene layer is provided with biometric molecule and the graphene-based field-effect transistor biosensor is prepared by growing a double graphene film on a metal foil base, transferring the graphene film onto the substrate and arranging the biometric molecule on the graphene layer. USE - Graphene-based field-effect transistor biosensor. ADVANTAGE - The graphene-based field-effect transistor biosensor can be prepared with high detection sensitivity in a rapid manner. DETAILED DESCRIPTION - A graphene-based field-effect transistor biosensor comprises a substrate and a channel layer that is arranged on the substrate, where the channel layer is provided with a functionalized graphene layer, the functionalized graphene layer is provided with a source electrode and a drain electrode at both ends, a surface of a middle part of the functionalized graphene layer is provided with biometric molecule and the graphene-based field-effect transistor biosensor is prepared by growing a double graphene film on a metal foil base, transferring the double graphene film onto the substrate as a channel layer, forming a graphene layer on the channel layer to form an active group functionalized graphene layer by a pulse plasma method, arranging the source electrode and the drain electrode on both ends of the functionalized graphene layer by photolithography and vapor deposition and arranging the biometric molecule on the surface of the functionalized graphene layer to obtain a final product.