▎ 摘　　要

NOVELTY - A graphene-polypyrrole-gold nanoparticle composite material comprises gold nanoparticle is supported on a graphene-polypyrrole composite by a combination of in-situ chemical polymerization and electrostatic adsorption. USE - Graphene-polypyrrole-gold nanoparticle composite material. ADVANTAGE - The graphene-polypyrrole-gold nanoparticle composite material has lowest detection limit and high selectivity, in simple, cost effective and convenient manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing a graphene-polypyrrole-gold nanoparticle composite material, which involves dissolving hydrochloric acid, pyrrole, graphene and water in the aqueous solution, dispersing graphene ultrasonically into the solution, which is recorded as solution M with ammonium persulfate and water meets a certain mass ratio, adding ammonium persulfate to the aqueous solution and recording as solution N, using mixed reaction of the solution to prepare a polypyrrole-graphene rice composite material, adding solution N dropwise to the solution M and stirring by a magnetic stirrer, after completing the dropwise addition, allowing the solution, reacting polypyrrole-graphene rice composite material for 2-4 hours, filtering, washing and drying, preparing gold nanoparticle solution with chloroauric acid, trisodium citrate, sodium borohydride and water in a certain mass ratio, adding chloroauric acid to water and stirring, adding trisodium citrate and adding sodium borohydride to obtain gold nanoparticle solution, adding the polypyrrole-graphene rice composite to the gold nanoparticle solution, stirring, filtering, washing and drying to obtain the finished product.