▎ 摘　　要

NOVELTY - Silver sulfide graphene composite material comprises silver sulfide nanomaterial and graphene material, where the silver sulfide nano material and graphene material are applied on surface of electrode, and silver sulfide nanomaterial is attached to the graphene material. USE - The silver sulfide graphene composite material is used for electrochemical sensor for electrochemical detection of trace gatifloxacin. ADVANTAGE - The silver sulfide graphene composite material adopts organic phase to synthesize silver sulfide nanomaterials of different sizes, ensures excellent electrochemical response, increases sensitivity. The electrochemical detection method has low cost, fast response, high sensitivity and excellent reliability, and uses simple equipment, which is convenient for rapid detection of trace and trace amounts of drugs. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the silver sulfide graphene composite material, which involves (a) adding silver diethyldithiocarbamate, oleic acid, octadecylamine and 1-octadecene as solvents to a three-necked flask, (b) stirring and heating the solution obtained in step (a), and reacting for a period of time under an inert gas atmosphere, (c) cooling the solution processed in step (b) to room temperature, adding a quenching agent to the reaction solution, washing and centrifuging to form nanocrystals, and (d) drying the nanocrystals formed in step (c) in air, and re-dispersing the nanocrystals in a non-polar organic solvent.