▎ 摘　　要

NOVELTY - Preparation method of hedgehog-shaped structure bismuth sulfide- graphene composite nano material, involves(1)adding oxidized graphene into deionized water, obtaining oxidized graphene concentration is 0.01-0.05mg/mL, then adding bismuth nitrate pentahydrate, magnetic stirring, then adding thiourea, continuously magnetic stirring to obtain reaction liquid; concentration of bismuth nitrate pentahydrate in the reaction solution is 0.01-0.03mol/L, concentration of 0.15-0.25mol/L;(2) transferring reaction liquid reaction kettle, reacting for 12-14h at 120-160℃ to obtain reaction solution, (3) centrifuging solution after reaction, cleaning, vacuum drying the precipitate after centrifuging and cleaning to obtain the hedgehog-shaped structure bismuth sulfide-graphene composite nano material. USE - Preparing hedgehog-shaped structure bismuth sulfide-graphene composite nano material. ADVANTAGE - The method has simple technique, high repeatability, small environment pollution, and effectively reduces the material agglomeration. The hedgehog-shaped structure of bismuth sulfide-graphene composite nanomaterial can effectively improve conductive performance, and has excellent nitrogen dioxide sensitive characteristics room temperature. The gas sensor prepared based on composite nano material has high response value, room temperature work and so characteristics, and is applied to the gas sensor field.