▎ 摘　　要

NOVELTY - Method for preparing indium sulfide nanosheet array/foamed graphene electrode, involves synthesizing indium sulfide nanosheet array/foamed graphene composite material, by (i) performing chemical vapor deposition by (a) placing nickel foam in quartz tube furnace, heating, heat-preserving, passing methane gas, and cooling, (b) dissolving polymethyl methacrylate, heating, dripping mixed solution onto graphene-coated nickel foam, naturally drying, and heat-preserving, (c) cutting polymethyl methacrylate-coated graphene foam, soaking in hydrochloric acid solution, and (d) dripping indium sulfide seed layer to graphene foam, and (ii) (a) dissolving indium chloride tetrahydrate and thioacetamide in ethylene glycol, and stirring, and (b) pouring hydrothermal reaction solution, and placing three-dimensional graphene foam/indium tin oxide (ITO) glass preformed with indium sulfide seed layer upside down in mixed solution, reacting, cooling, cleaning composite material, and cooling. USE - The method is useful for preparing indium sulfide nanosheet array/foamed graphene electrode as working electrode (claimed). ADVANTAGE - The method solves the problem of low adrenergic sensitivity of material detection, and provides high sensitivity, excellent selectivity, repeatability and stability. DETAILED DESCRIPTION - Method for preparing indium sulfide nanosheet array/foamed graphene electrode, involves synthesizing indium sulfide nanosheet array/foamed graphene composite material, by (i) performing chemical vapor deposition by (a) placing nickel foam with a density of 420-440 g/m2 and a thickness of 1.6-2 mm in center of a quartz tube furnace under the protection of argon gas with a flow rate of 480-500 sccm and hydrogen gas with a flow rate of 180-200 sccm, heating from room temperature at a heating rate of 20-40 degrees C/minute to 1000-1100 degrees C, heat-preserving at 1000-1100 degrees C for 30-60 minutes, passing methane gas to the tube furnace at a rate of 5-10 sccm at 1000-1100 degrees C for 5-20 minutes, and cooling the quartz tube furnace from a temperature of 1000-1100 degrees C at a cooling rate of 80-100 degrees C/minute to room temperature to obtain a nickel foam wrapped by graphene, (b) dissolving 4-5 %mass polymethyl methacrylate in ethyl lactate, heating and stirring at 80-120 degrees C for 1-2 hours to obtain a mixed solution, according to the usage amount of 100-200 mu l per cm2, using a sample gun for dripping the mixed solution onto the graphene-coated nickel foam obtained in step (a), naturally drying at room temperature, and heat-preserving at 150-200 degrees C for 0.5-1 hours to obtain a foamed graphene coated with polymethyl methacrylate, (c) cutting the polymethyl methacrylate-coated graphene foam obtained in step (b) into cubes with a surface area of 0.5-2 cm2, completely soaking in a hydrochloric acid solution with a concentration of 3-4 mol/l at 80-90 degrees C for 4-6 hours to obtain nickel-removed three-dimensional graphene foam, and (d) dripping indium sulfide seed layer to the graphene foam using a sample gun with a usage amount of 50-100 mu l per cm2 of the three-dimensional graphene foam obtained in step (a), and placing at a 150-200 degrees C for 40-60 minutes to obtain a three-dimensional foamed graphene/indium tin oxide (ITO) glass with an indium sulfide seed layer, where the clean indium tin oxide (ITO) glass is obtained by ultrasonically cleaning ITO glass in acetone for 15-20 minutes, ultrasonically cleaning with ethanol for 15-20 minutes and deionized water for 15-20 minutes, and naturally drying at room temperature, and the indium sulfide seed layer solution is prepared by dissolving indium chloride tetrahydrate and thioacetamide in ethanol, magnetically stirring at 450-550 rpm for 3-5 minutes to obtain an indium sulfide seed layer solution, where the concentration of indium chloride tetrahydrate in the indium sulfide seed layer solution is 0.01-0.03 mol/l, and the concentration of thioacetamide is 0.05-0.07 mol/l, and (ii) performing hydrothermal synthesis by (a) dissolving indium chloride tetrahydrate with a concentration of 0.01-0.03 mol/l and thioacetamide with a concentration of 0.05-0.07 mol/l in ethylene glycol, and magnetically stirring at 450-550 rpm for 15-20 minutes to obtain a hydrothermal reaction solution, and (b) pouring the hydrothermal reaction solution obtained in step (iia) to the reaction kettle, and placing the three-dimensional graphene foam/ITO glass preformed with indium sulfide seed layer obtained in step (id) upside down in the mixed solution in the reaction kettle, covering the lid of the reaction kettle, reacting at 190-210 degrees C for 8-14 hours, taking out and naturally cooling to room temperature in argon with a flow rate of 480-500 sccm to obtain a composite material, cleaning the composite material with distilled water, maintaining at 450-500 degrees C for 0.5-1 hour, and cooling to room temperature with the furnace to obtain the indium sulfide nanosheet array/foam graphene composite material.