▎ 摘　　要

NOVELTY - Gas molecule detecting composite film, produced by e.g. (a) drawing a graphene oxide film on the anodic aluminum oxides (AAO) base film; (b) compounding a metal oxide layer or a metal layer on the surface of the graphene oxide base film to form an ultrathin film; (c) placing the AAO carrying the membrane structure on the surface of the water with the surface of the ultra-thin film facing upward, pressing AAO to sink the AAO, and obtaining a graphene-based ultra-thin film floating on the water surface; (d) lifting the graphene-based ultra-thin film floating on the water surface from the bottom with a silicon substrate, so that the graphene film is laid on the surface of the substrate; (e) evaporating the moisture in the graphene-based ultrathin film at room temperature, freeze drying, and the graphene oxide film is detached from the surface; and (f) reducing the graphene-based ultrathin film, so that its electrical conductivity is greater than 50 S/cm. USE - Used as a gas molecule detecting composite film. ADVANTAGE - The film has: a small thickness and can even reach multiple nanometers; and has extremely high sensitivity. DETAILED DESCRIPTION - Gas molecule detecting composite film, produced by (a) drawing a graphene oxide film on the anodic aluminum oxides (AAO) base film; (b) compounding a metal oxide layer or a metal layer on the surface of the graphene oxide base film to form an ultrathin film; (c) placing the AAO carrying the membrane structure on the surface of the water with the surface of the ultra-thin film facing upward, pressing AAO to sink the AAO, and obtaining a graphene-based ultra-thin film floating on the water surface; (d) lifting the graphene-based ultra-thin film floating on the water surface from the bottom with a silicon substrate, so that the graphene film is laid on the surface of the substrate; (e) evaporating the moisture in the graphene-based ultrathin film at room temperature so that the water content is more than 50 wt.%, the graphene-based ultra-thin film after the evaporation treatment is freeze-dried, and the graphene oxide film is detached from the surface of the silicon wafer; and (f) reducing the graphene-based ultrathin film, so that its electrical conductivity is greater than 50 S/cm.