▎ 摘　　要

NOVELTY - Preparation of reduced graphene oxide/zinc phthalocyanine composite film comprises preparing 1 mg/mL graphene oxide dispersion, dropping on the surface of indium tin oxide (ITO) glass plate, vacuum drying, immersing electrode in 0.1 M phosphate buffer solution, reducing graphene oxide by cyclic voltammetry to obtain reduced oxide graphene modified ITO glass plate, adding zinc phthalocyanine to zinc phthalocyanine/reduced graphene oxide (RGO) composite film by cyclic voltammetry, placing in closed test system and introducing nitrogen dioxide gas in test chamber. USE - Method of preparing reduced graphene oxide/zinc phthalocyanine composite film used for monitoring nitrogen dioxide (claimed). ADVANTAGE - The method is simple, environment-friendly and has high sensitivity for nitrogen dioxide.