▎ 摘　　要

NOVELTY - Preparation of three-dimensional porous graphene ultra-thin film gas sensor involves adding liquid oxidant and sulfate to aqueous solution of enriched-graphene, adjusting pH to 1-4 with acid, sonicating to form oxidized graphene dispersion, treating oxidized graphene dispersion by ultraviolet treatment, and performing dialysis treatment to obtain belt at 1500-4000 W for 0.5-30 minutes; adding p-phenylenediamine to negatively charged porous graphene dispersion solution to obtain positively charged porous graphene dispersion liquid by refluxing reaction; and immersing. USE - Method for preparing three-dimensional porous graphene ultra-thin film gas sensor (claimed). ADVANTAGE - The method is simple and suitable large number of sensors. It has high sensitivity to gas molecules. DETAILED DESCRIPTION - Preparation of three-dimensional porous graphene ultra-thin film gas sensor comprises adding liquid oxidant and sulfate to aqueous solution of enriched-graphene, adjusting pH to 1-4 with acid, sonicating to form oxidized graphene dispersion, treating oxidized graphene dispersion by ultraviolet treatment, and performing dialysis treatment to obtain belt at 1500-4000 W for 0.5-30 minutes; adding p-phenylenediamine to negatively charged porous graphene dispersion solution to obtain positively charged porous graphene dispersion liquid by refluxing reaction; immersing amino-modified silicon substrate in negatively charged porous graphene dispersion and positively charged porous graphene dispersion, and repeating mixture for 1-60 times to obtain three-dimensional porous graphene ultrafine film; and preparing electrode on surface of three-dimensional porous graphene ultrafine film.