▎ 摘　　要

NOVELTY - Preparing tin dioxide-reduced graphene oxide (SnO2-RGO) nanocomposite material, comprises adding stannic chloride pentahydrate to deionized water under stirring and mixing, and adding 1 mg/mL graphene oxide aqueous solution under stirring for 4 hours to obtain a mixed solution. The mixed solution is put into a stainless steel reaction kettle to conduct a hydrothermal reaction at 180℃, and collected the supernatant by centrifugation to obtain a preliminary product. The obtained preliminary finished product is washed with deionized water and sequentially, and then dried at 65℃ to obtain the final nanocomposite material. USE - Method for preparing tin dioxide-reduced graphene oxide nanocomposite material used for real-time monitoring of nitrogen dioxide gas (claimed). ADVANTAGE - The method prepares the nanocomposite material with fast response speed and high sensitivity.