▎ 摘　　要

NOVELTY - Preparing graphene/zinc oxide nano-line array/three-dimensional foam composite material comprises e.g. placing nickel foam in the quartz tube type furnace center, heating until the temperature reaches 900-1200 degrees C from room temperature, under 900-1200 degrees C temperature condition heat preservation for 30-60 minutes, introducing methane gas into tubular furnace at rate of 5-10 sccm for 5-20 minutes, cooling to room temperature at cooling rate of 70-90 degrees C/minute from 900-1200 degrees C, obtaining graphene coated foamed nickel, hydrothermal synthesis and chemical vapor deposition. USE - The graphene/zinc oxide nano-line array/three-dimensional foam composite material is used as working electrode in biosensor (claimed). ADVANTAGE - The composite material has large specific surface area and excellent electrical conductivity. DETAILED DESCRIPTION - Preparing graphene/zinc oxide nano-line array/three-dimensional foam composite material comprises (ia) placing nickel foam in the quartz tube type furnace center, heating until the temperature reaches 900-1200 degrees C from room temperature at heating rate of 10-30 degrees C/minute under protection of the argon gas and hydrogen gas, under 900-1200 degrees C temperature condition heat preservation for 30-60 minutes, introducing methane gas into tubular furnace at rate of 5-10 sccm under 900-1200 degrees C temperature for 5-20 minutes, cooling the temperature quartz tube type furnace to room temperature at cooling rate of 70-90 degrees C/minute from 900-1200 degrees C, obtaining graphene coated foamed nickel, whose density is 420-440 g/m2, the thickness is 1.5-2 mm, where the flow rate of the argon gas is 450-550 sccm, and the flow speed of the hydrogen is 150-250 sccm, (ib) adding methyl methacrylate into ethyl lactate, heating and stirring at 80-120 degrees C conditions for 1-2 hours to obtain mixed solution, dripping the mixed solution into according to quantity of 100-200 mu l/cm2 on step (ia) graphene-coated foamed nickel surface, naturally drying at room temperature, insulating under 150-200 degrees C temperature condition for 0.5-1 hour to obtain polymethyl methacrylate surface coated foamed graphene, where mass fraction of the methyl methacrylate is 4-5 wt.%, (ic) cutting the step (ib) polymethyl methacrylate surface coated foamed graphene into cube having 0.5-2 cm2 area, completely soaking at 80-90 degrees C in 3-4 mol/l hydrochloric acid solution for 4-6 hours to obtain nickel removed three-dimensional graphene foam, (id) immersing the step (ic) nickel removed three-dimensional graphene foam in acetone at 50-80 degrees C temperature for 1-2 hours to obtain polymethylmethacrylate removed graphene foam, using distilled water cleaning polymethylmethacrylate removed graphene foam, moving polymethylmethacrylate removed graphene foam into clean ITO glass, drying, according to quantity of 50-120 mu l adding zinc oxide seed layer solution to the cleaned polymethylmethacrylate removed graphene foam with sample gun, insulating ITO glass under 150-200 degrees C temperature for 20-30 minutes obtain zinc oxide seed layer prefabricated three-dimensional foam graphene/ITO glass, where the clean ITO glass is orderly ultrasonic cleaning for 10-20 minutes in acetone, cleaning in ethanol for 10-20 minutes and cleaning in de-ionized water for 10-20 minutes, naturally drying at room temperature, the zinc oxide seed layer solution is prepared by dissolving zinc acetate in methanol, magnetic stirring at 400-500 revolutions/minute for 2-5 minutes to obtain zinc oxide seed layer solution, where in the zinc oxide seed layer solution, the zinc acetate concentration is 0.01-0.05 mol/l, (iia) using distilled water as solvent preparing 0.05-0.1 mol/l zinc nitrate solution, 0.05-0.1 mol/l hexamethylene tetramine solution, 0.1-0.5 mol/l aqueous ammonia solution and 1-5 mmol/l polyetherimide solution, mixing the four kinds of solutions uniformly, magnetic stirring at 450-550 revolutions/minute for 3-5 minutes to obtain hydrothermal reaction solution, (iib) adding hydrothermal reaction solution into reaction kettle, placing zinc oxide seed layer prefabricated three-dimensional foam graphene/ITO glass in mixed solution in the reaction kettle, covering the kettle cover, reacting at 90-120 degrees C for 8-12 hours, taking out, naturally cooling to the room temperature in the air to obtain composite material, opening the reaction kettle, cleaning the composite material with distilled water, heat preservation at 400-500 degrees C for 1-2 hours, cooling to room temperature along with the furnace, obtaining zinc oxide nanowire array/three-dimensional graphene foam composite material, and (iii) placing the step (ii) obtained the zinc oxide nanowire array/three-dimensional graphene foam composite material in quartz tube type furnace center, heating from room temperature at heating rate of 10 degrees C-30 degrees C/minute to 600-800 degrees C under protection of argon, insulating at 600-800 degrees C temperature conditions for 40-60 minutes, introducing methane gas into tubular furnace at a rate of 5-10 sccm under 600-800 degrees C temperature for 10-20 minutes, cooling the quartz tube type furnace at 20-40 degrees C rate from 600-800 degrees C to room temperature to obtain graphene/zinc oxide nano-line array/graphene three-dimensional foam composite material, where the flow rate of argon is 450-550 sccm.