▎ 摘　　要

NOVELTY - Preparing multilayer graphene-multi-walled carbon nanotubes three-dimensional carbon material comprises (i) mixing dimethylformamide and distilled water to obtain a mixed solvent, (ii) adding expanded graphite, and ultrasonically oscillating to obtain multilayer graphene, (iii) adding cobalt acetate tetrahydrate and manganese acetate tetrahydrate into the mixed solution, stirring, pouring the solution into a hydrothermal reaction kettle, and cooling, (iv) centrifugally washing and drying to obtain catalyst supported graphene, (v) loading the resulting graphene in quartz tube, and (vi) cooling. USE - The method is useful for preparing multilayer graphene-multi-walled carbon nanotubes three-dimensional carbon material (claimed). ADVANTAGE - The method: utilizes acetylene as carbon source; adopts chemical vapor deposition process; and is simple. DETAILED DESCRIPTION - Preparing multilayer graphene-multi-walled carbon nanotubes three-dimensional carbon material comprises (i) mixing dimethylformamide and distilled water according to volume ratio of 8:2 to obtain a mixed solvent, (ii) adding expanded graphite, and ultrasonically oscillating for 2-7 hours to obtain multilayer graphene, (iii) adding cobalt acetate tetrahydrate and manganese acetate tetrahydrate into the mixed solution, stirring for 5-10 minutes, pouring the solution into a hydrothermal reaction kettle, where the filling degree of the solution is 20-50% in the reaction kettle, keeping the temperature at 100-130 degrees C for 2 hours, and cooling to room temperature, (iv) taking out, centrifugally washing the reactant using ethanol and water for 3 times, then placing in a drying box, and drying at 60 degrees C for 24 hours to obtain catalyst supported graphene, (v) heating a quartz tube by setting temperature to 500-650 degrees C, using nitrogen for emptying, then loading the catalyst supported graphene in the quartz tube, rising the temperature in the quartz tube to set temperature, introducing nitrogen and acetylene, keeping for 5-20 minutes, where nitrogen air flow is 50-200 ml/minute, and acetylene gas flow rate is 20-60 ml/minute, and (vi) under protection of nitrogen, cooling to room temperature, and taking out. An INDEPENDENT CLAIM is also included for multilayer graphene-multi-walled carbon nanotubes three-dimensional carbon material obtained by uniformly distributing multiple nanotubes on the upper and lower surfaces of the multilayer graphene, where the multilayer graphene surface contains oxygen functional groups of less than 3%, and layers are less than 100 layers, carbon nanotubes are adhered to the bottom surface of the graphene, and graphene grows on both sides at outward direction, where the carbon nanotubes are multi-walled carbon nanotubes, nanotube length is less than 5 mu m, the outer diameter of the nanotubes is 50-100 mu m, inner diameter is 4-20 nm, and spacing between carbon nanotubes is less than 200 nm.