▎ 摘　　要

NOVELTY - The sensor has an electrode downlead (3), an insulating layer (4), and a glass substrate (1) coated with a sulfide key-graphene sensitive film (2). The sulfide key-graphene sensitive film is prepared by uniformly dispersing sulfide key-graphene composite material in secondary distilled water. USE - Sulfide key-graphene electrochemical sensor for synchronously detecing dopamine, paracetamol and ascorbic acid (all claimed). ADVANTAGE - The sensor has good stability, high sensitivity and good repeatability. The sensor prevents environment pollution caused by inorganic nano material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a sulphide key-graphene electrochemical sensor preparing method. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a sulfide key-graphene electrochemical sensor. Glass substrate (1) Sulphide key-graphene sensitive film (2) Electrode downlead (3) Insulating layer (4)