▎ 摘　　要

NOVELTY - Polymer modified graphene composite material comprises molybdenum disulfide, graphene, quantum graphene and polymer. USE - The polymer-modified graphene composite material is useful in preparing a gas sensor (claimed). ADVANTAGE - The composite material can be applied for preparing a sensor with excellent nitrogen dioxide detection performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a gas sensor, comprising a substrate and polymer-modified graphene composite material as a gas-sensitive material; preparing polymer modified graphene composite material comprising mixing molybdenum disulfide, graphene oxide, graphene quantum dots and water, heating and reacting to obtain a graphene composite material, and then using pyrrole as a raw material, and modifying the polymer by gas-phase polymerization on the surface of the graphene composite material to obtain a polymer-modified graphene composite material; and preparing gas sensor comprising using a mixture of molybdenum disulfide, graphene oxide, graphene quantum dots and water, heating and reacting to obtain a graphene composite material, dropping the graphene composite material, coating on a substrate, drying, and then subjecting to a gas phase polymerization modification polymer on the surface of the graphene composite material to obtain a gas sensor.