▎ 摘　　要

NOVELTY - Preparing graphene carbon nanotube (CNT) composite film based on three-dimensional network shape comprises taking glass, tantalum, silicon sheet, stainless steel sheet or polyethylene glycol terephthalate as a substrate, drying, washing, preparing CNT solution, ultrasonically dispersing graphene oxide in deionized water to obtain graphene oxide solution, mixing the two solutions, spray coating the mixed solution on the substrate, post-processing by e.g. loading on tantalum, silicon sheet or stainless steel sheet, mixing, annealing, soaking in nitric acid solution, and naturally drying. USE - The method is useful for preparing graphene CNT composite film based on three-dimensional network shape. ADVANTAGE - The composite film has adjustable transmission rate and surface resistance with good uniformity and stability and simple to prepare, can be loaded on a rigid substrate or a flexible substrate. DETAILED DESCRIPTION - Preparing graphene carbon nanotube (CNT) composite film based on three-dimensional network shape comprises: (a) taking glass, tantalum, silicon sheet, stainless steel sheet or polyethylene glycol terephthalate as a substrate, alternately vacuum drying the substrate, ultrasonically washing with deionized water and ethanol, (b) preparing CNT solution by adding CNT into sulfuric acid (98%) and nitric acid (65%) in a volume ratio of 3:1 to obtain solution with a concentration of 0.1-3 g/ml, heating and reflowing for 2 hours at 9-10 degrees C, filtering, repeatedly washing the filter cake with deionized water until neutral, drying at 60-80 degrees C under vacuum to obtain carboxy, sulfonic group and hydroxy modified CNT tube, dispersing CNT in deionized water for ultrasonic dispersion to obtain CNT solution with a concentration of 0.05-0.2 mg/ml, and marking as solution A, (c) ultrasonically dispersing graphene oxide in deionized water to obtain graphene oxide solution (0.5-2 mg/ml), and marking as solution B, (d) mixing the solutions A and B in a ratio of 10:1, ultrasonically processing in an ice bath for 10-30 minutes to obtain a mixed solution, spray coating the mixed solution on the washed substrate based on high and low requirement of the transmission rate of the film to form graphene-CNT composite film, and (e) post-processing the graphene-CNT composite film by (e1) loading on tantalum, silicon sheet or stainless steel sheet, placing into a vacuum tube type furnace at 400-550 degrees C under the protection of a mixed gas containing hydrogen and argon in a volume ratio of 1:4, mixing, where the total gas flow rate of the mixed gas is 200-300 cm3/minute, annealing for 2 hours, soaking in 65% nitric acid solution for 5-12 hours, naturally drying at room temperature to obtain graphene-CNT composite film of three-dimensional network shape or (e2) loading polyethylene glycol terephthalate on the upper part of graphene-CNT composite film, soaking in deionized water for 10-20 minutes, placing into oven at 60-80 degrees C for 20-30 minutes, soaking in 65% nitric acid solution for 0.5-12 hours, naturally drying at room temperature.