Gas sensor sensitive material and preparation method thereof

The preparation method comprises the following steps: mixing graphene with concentrated sulfuric acid and concentrated nitric acid to obtain a product, carrying out suction filtration on the product, dissolving the product in a liquid for dialysis, taking a solution outside a dialysis bag, and drying the solution to obtain graphene quantum dots, the graphene quantum dots and tetracarboxyl metal phthalocyanine being in the same order of magnitude; dissolving ethylenediamine, tetracarboxyl metal phthalocyanine and the graphene quantum dots in a mixed solution of water and N, N-dimethylformamide for reaction, and drying to obtain a solid product. The gas sensor sensitive material is used for solving the problems that in the prior art, in the process that a single GR sheet is usually piled to form a conductive network, a compact structure is formed, and gas molecules are easily blocked and stuck, so that full contact between the GR sheet in the conductive network and the gas molecules is not facilitated, and the