▎ 摘　　要

NOVELTY - The method involves preparing three-dimensional (3D) porous graphene oxide dispersion liquid by taking natural graphite flake as a precursor. Micro-sphere is prepared with positive electricity by aminated polystyrene microspheres. The GO dispersion is wrapped with negative electricity on a surface of the polystyrene microspheres for heating and stirring oleic acid, oil amine and pentachloride tin chloride to prepare precursor. Ethanol is added to the prepared precursor and heated to obtain Tin dioxide Stannic oxide quantum dots. The prepared 3D porous graphene and quantum dot are mixed after surface ligands exchange and stirred to obtain a composite material of 3D porous graphene quantum dot. USE - Method for preparing gas sensor based on 3D porous graphene oxide dispersion quantum dot composite material for monitoring part of combustible, toxic and polluted gas. ADVANTAGE - The method enables simplifying gas sensor preparing steps, and realizing mass preparation of gas sensor, and detecting low concentration target gas at a lower working temperature. DESCRIPTION OF DRAWING(S) - The drawing shows a graph view illustrating a gas-sensitive characteristic response curve of a 3D porous graphene oxide dispersion quantum dot composite material.(Drawing includes non-English language text)