▎ 摘　　要

NOVELTY - Preparation method of Cu2O@CuO-RGO nano-composite material, involves(1)adding graphene oxide into cuprous oxide dispersion liquid under an alkaline condition to obtain mixed liquid; mass concentration of the cuprous oxide dispersion liquid is 1-5 mg/mL; pH of the alkaline condition is 9-14;(2) stirring and reacting mixed solution to obtain Cu2O @ CuO-RGO nano-composite. USE - Preparation method of cuprous oxide @ copper oxide-graphene nano composite used in detecting nitrogen dioxide(claimed). ADVANTAGE - The method has simple process, safety and reliability, high purity, low cost and easy large-scale preparation; preparation of the obtained Cu 2 TheCu2O@CuO-RGO multi-stage nano composite material has outstanding advantages in application of detecting nitrogen dioxide gas.