▎ 摘　　要

NOVELTY - Polypyrrole-graphene nanocomposite gas-sensing structural material with three-dimensional porous characteristics prepared by adding suspended droplets of uniformly dispersed and reduced graphene oxide to pyrrole polymerization reaction solution under continuous stirring, adding hydrochloric acid dropwise to adjust pH of mixed solution to 1-3, adding solution of initiator dropwise to mixed solution to initiate the reaction, and polymerizing pyrrole monomer on surface of reduced graphene oxide to form uniform shell of polypyrrole, is claimed, where (i) mechanical or magnetic force is used for stirring at speed of 100-200 rotations per minute, (ii) in pyrrole polymerization reaction solution, the molar ratio of sodium dodecylbenzenesulfonate and pyrrole monomer is 1-1.5:3, (iii) molar ratio of initiator and pyrrole monomer is 0.5-1:6, (iv) the mass molar ratio of reduced graphene oxide and pyrrole monomer is 1-3:1, and (v) solution of initiator is added dropwise to mixed solution. USE - The material is useful for detecting of ammonia gas at room temperature (claimed) and ammonia-sensitive sensor. ADVANTAGE - The material: has high-sensitivity response to ppb-level ammonia gas at room temperature. DETAILED DESCRIPTION - Polypyrrole-graphene nanocomposite gas-sensing structural material with three-dimensional porous characteristics prepared by adding suspended droplets of uniformly dispersed and reduced graphene oxide to pyrrole polymerization reaction solution under continuous stirring, adding hydrochloric acid dropwise to adjust pH of mixed solution to 1-3, adding solution of initiator dropwise to mixed solution to initiate the reaction, and polymerizing pyrrole monomer on surface of reduced graphene oxide to form uniform shell of polypyrrole, is claimed, where (i) mechanical or magnetic force is used for stirring at the speed of 100-200 rotations per minute, (ii) in the pyrrole polymerization reaction solution, the molar ratio of sodium dodecylbenzenesulfonate and pyrrole monomer is 1-1.5:3, (iii) molar ratio of initiator and pyrrole monomer is 0.5-1:6, (iv) the mass molar ratio of reduced graphene oxide and pyrrole monomer is 1-3:1, and (v) the solution of the initiator is added dropwise to mixed solution in a uniform speed in a dropwise manner for 1-5 minutes, where reduced graphene oxide is used as three-dimensional framework, and pyrrole monomer which undergoes a polymerization reaction on the surface of reduced graphene oxide to form uniform shell of polypyrrole. INDEPENDENT CLAIMS are also included for: (1) preparing the polypyrrole-graphene nanocomposite gas-sensing structural material with three-dimensional porous characteristics by the above mentioned method; (2) room temperature high-sensitivity ammonia sensor based on polypyrrole-graphene nanocomposite gas-sensing structural material with three-dimensional porous characteristics comprises a platinum interdigitated electrode provided on the alumina ceramic base. The platinum interdigitated electrode is provided with a coating of polypyrrole-graphene nanocomposite gas-sensitive structural material with three-dimensional porous characteristics; and (3) use method of the polypyrrole-graphene nanocomposite gas-sensing structural material with three-dimensional porous characteristics in detecting of ammonia gas at room temperature by dynamic response to ammonia at 330 ppb and 660 ppb at a room temperature of 20 degrees C and a humidity of 15%, where the response sensitivities to ammonia gas are: 1.16, 1.86, and the dynamic response curve to ammonia is at 1-5 ppm, and the sensitivity to ammonia is 4.47, 7.91, 10.19, 11.18, and the response time is 1-3 seconds.