▎ 摘　　要

NOVELTY - The preparation method of dopamine electrochemical sensor, involves: (S1) taking terephthalic acid, polyvinyl pyrrolidone, nickel nitrate and cobalt nitrate, then dissolving them into in a mixed solution of deionized water, dimethylformamide (DMF) and ethanol, ultrasonically dispersing for more than half an hour to ensure it is completely dissolved, after the solution is clear, transferring it into the reaction vessel to react in the oven, naturally cooling after the reaction is finished, using high speed centrifuge for centrifuging and sequentially washing with DMF and methanol, washing with water, vacuum drying to obtain nickel cobalt (NiCo)-metal organic framework (MOF), putting the prepared NiCo-MOF in a tubular furnace to anneal to obtain the magnetic black powder i.e. nickel-cobalt oxide (NiO/Co3O4)-carbon nanotubes (CNTs), weighing NiO/Co3O4-CNTs powder, adding DMF solution, then adding sodium chloride, ultrasonically dispersing the suspension. USE - Preparation method of dopamine electrochemical sensor. ADVANTAGE - The NiO-Co3O4-CNTs/reduced graphene oxide/glassy carbon electrode electrochemical sensor is prepared by virtue of the excellent electron conduction capability of reduced graphene oxide and the active site of NiCo-CNTs. It has lower detection limit, wide detection range, outstanding selectivity and stability. DETAILED DESCRIPTION - The preparation method of dopamine electrochemical sensor, involves: (S1) taking terephthalic acid, polyvinyl pyrrolidone, nickel nitrate and cobalt nitrate, then dissolving them into in a mixed solution of deionized water, dimethylformamide (DMF) and ethanol, ultrasonically dispersing for more than half an hour to ensure it is completely dissolved, after the solution is clear, transferring it into the reaction vessel to react in the oven, naturally cooling after the reaction is finished, using high speed centrifuge for centrifuging and sequentially washing with DMF and methanol, washing with water, vacuum drying to obtain nickel cobalt (NiCo)-metal organic framework (MOF), putting the prepared NiCo-MOF in a tubular furnace to anneal to obtain the magnetic black powder i.e. nickel-cobalt oxide (NiO/Co3O4)-carbon nanotubes (CNTs), weighing NiO/Co3O4-CNTs powder, adding DMF solution, then adding sodium chloride, ultrasonically dispersing the suspension, obtaining NiO-Co3O4-CNTs electro-deposition solution, taking the polished and dried glassy carbon electrode inserted into the graphite oxide electrodeposition solution, using cyclic voltammetry to scan the glassy carbon electrode and drying to obtain the glassy carbon electrode deposited by the graphite oxide; (S2) scanning the electrodeposition solution and electrodepositing onto the graphite oxide of the glassy carbon electrode by cyclic voltammetry and reducing the graphene oxide on the glassy carbon electrode; and (S3) placing the glassy carbon electrode in a blank PBS buffer solution, and then using cyclic voltammetry to scan to reduce graphite oxide. An INDEPENDENT CLAIM is included for the dopamine electrochemical sensor.