▎ 摘　　要

NOVELTY - Zinc oxide nanowire array/graphene foam composite material is synthesized by contacting nickel foam with hydrogen gas and methane gas at 1000-1100 degrees C and carrying out chemical vapor deposition to obtain graphene coated nickel foam; soaking the graphene coated nickel foam into hydrochloric acid solution to remove nickel to obtain three-dimensional (3D) graphene foam; dripping zinc oxide seed solution into the 3D graphene foam to obtain zinc oxide seed layer/3D foam graphene; and subjecting zinc oxide seed layer/3D foam graphene to hydrothermal reaction at 90-110 degrees C for 6-12 hours. USE - Method of synthesizing zinc oxide nanowire array/graphene foam composite material used as working electrode (claimed) used in dopamine detection. ADVANTAGE - The method can obtain composite material having improved sensitivity of dopamine. DETAILED DESCRIPTION - Synthesis of zinc oxide nanowire array/graphene foam composite material comprises: (A) putting nickel foam in quartz tube type furnace under protection of argon gas and hydrogen gas and heating to 1000-1100 degrees C at rate of 20-40 degrees C/minute, preserving heat for 30-60 minutes, then introducing methane gas for 5-20 minutes, carrying out chemical vapor deposition, then cooling the furnace at cooling rate of 80-100 degrees C/minute and cooling to room temperature to obtain graphene coated nickel foam; (B) heating and stirring polymethyl methacrylate dissolved in ethyl lactate at 80-120 degrees C for 1-2 hours to obtain mixed solution, dripping the mixed solution into the graphene coated nickel foam, naturally drying at room temperature, then drying at 150-200 degrees C for 0.5-1 hour to obtain polymethyl methacrylate surface-coated graphene foam; (C) completely soaking the polymethyl methacrylate surface-coated graphene foam into 3-4 mol/L hydrochloric acid solution at 80-90 degrees C for 4-6 hours to remove nickel to obtain three-dimensional (3D) graphene foam; (D) cleaning the 3D graphene foam temperature with acetone at 60-70 degrees C for 0.5-1.5 hours and then with distilled water to remove polymethyl methacrylate, putting the cleaned 3D graphene foam to a clean indium tin oxide (ITO) glass, dripping zinc oxide seed solution into the 3D graphene foam at 150-200 degrees C for 20-30 minutes to obtain zinc oxide seed layer/3D foam graphene on ITO glass, ultrasonically cleaning with acetone, ethanol and deionized water for 15-20 minutes each, and naturally drying at room temperature, where the zinc oxide seed solution is prepared by adding 0.001-0.05 mol/L zinc acetate into methanol to dissolve, and magnetically stirring at 450-550 revolutions/minute (rpm); (E) uniformly mixing 0.01-0.1 mol/L zinc nitrate aqueous solution, 0.01-0.1 mol/L hexamethylenetetramine aqueous solution, 0.01-0.1 mol/L ammonia water aqueous solution and 5-10 mmol/L polyether imide aqueous solution, and magnetically stirring at 450-550 rpm for 3-5 minutes to obtain mixed solution; and (F) putting mixed solution into a hydrothermal reaction kettle, then adding zinc oxide seed layer/3D foam graphene into the reaction kettle, sealing and performing hydrothermal reaction at 90-110 degrees C for 6-12 hours, then taking out reaction product and naturally cooling to room temperature in air, cleaning with distilled water, drying at 400-450 degrees C for 1-1.5 hours, and cooling to room temperature to obtain the zinc oxide nanowire array/foam graphene composite material.