▎ 摘　　要

NOVELTY - Synthesizing a graphene oxide membrane, comprises exposing a graphite to microwave radiation so as to exfoliate at least a portion of the graphite into a layered structure and oxidizing the layered structure so as to give rise to a graphene oxide membrane having an upper surface and a lower surface. USE - The graphene oxide membrane is useful: in a sensor device for detecting an analyte; in a composite material (all claimed); and in transistors and other devices. ADVANTAGE - The method provides graphene oxide membrane with high yield, high surface area and enhanced electrical, mechanical and thermal properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a graphene oxide membrane made by the above method; (2) a membrane, comprising the graphene oxide membrane having an electrical conductivity of 200-500 S/m, where the upper and/or lower surface comprises a surface area of up to 2500 mu m2; (3) a sensor device, comprising a reduced graphene oxide membrane, a biomolecule in electrical connection with the graphene oxide membrane and a detector in electrical communication with the graphene oxide membrane, where the interaction between a biomolecule and its environment changes an electrical characteristic of the detector, and the change being capable of being transmitted along at least a portion of the graphene oxide membrane to the detector; (4) a method of detecting an analyte comprising providing the sensor device comprising graphene oxide membrane having an electrical conductivity of 200-400 S/m and biomolecule, where the biomolecule being capable of binding to an analyte, and the binding of the analyte gives rise to an electrical change within the sensor device, exposing the biomolecule to the analyte to give rise to the analyte binding to the biomolecule and monitoring a change in the electrical conductivity of the graphene oxide membrane effectuated by the binding of the analyte to the biomolecule; and (5) a composite material comprising the graphene oxide membrane, which is incorporated into a polymeric material by way of one or more bonds to a repeat unit of the polymer.