▎ 摘　　要

NOVELTY - The preparation method of low-defect graphene strip sponge composite material involves: (1) dissolving catalyst ferrocene in 1,2-dichlorobenzene, injecting the obtained catalyst/carbon source solution into a preheating zone of a tubular furnace for vaporization, introducing hydrogen/argon carrier gas into the reaction zone of the tubular furnace, and reacting to form a carbon nanotube sponges; and (2) adding potassium permanganate to a mixed acid of sulfuric acid and phosphoric acid, and carrying out ultrasonic dispersion to form a strong oxidizing solution. USE - The method is useful for preparing low-defect graphene strip sponge composite material. ADVANTAGE - The method prepares low-defect graphene strip sponge composite material with high Young's modulus and tensile strength. DETAILED DESCRIPTION - The preparation method of low-defect graphene strip sponge composite material involves: (1) dissolving catalyst ferrocene in a liquid carbon source 1,2-dichlorobenzene to obtain a catalyst/carbon source solution, injecting the catalyst/carbon source solution into a preheating zone of a tubular furnace for vaporization, introducing hydrogen/argon carrier gas into the reaction zone of the tubular furnace, and reacting to form carbon nanotube sponges, where the carbon nanotube sponges are prepared by chemical vapor deposition method; (2) adding potassium permanganate to a mixed acid of sulfuric acid and phosphoric acid, and carrying out ultrasonic dispersion to form a strong oxidizing solution; (3) immersing the carbon nanotube sponges obtained in step (1) in the strong oxidizing solution obtained in step (2), leaving still at room temperature, then vacuumizing to remove air, taking out the carbon nanotube sponges filled with oxidizing solution, and leaving still to obtain a graphene strip sponge; (4) taking hydrogen peroxide into ice water, putting the graphene strip sponge obtained in step (3), cooling to room temperature until no bubbles are generated, then putting the graphene strip sponge into a hydrochloric acid solution for soaking to remove impurities, replacing hydrochloric acid with deionized water until the pH-value is 6-8, and replacing deionized water with absolute ethanol; (5) drying the graphene strip sponge obtained in step (4) by adopting carbon dioxide supercritical drying method; (6) putting the dried graphene strip sponge obtained in step (5) and hydrazine hydrate into a reaction container, and reacting to obtain a chemically reduced low-defect graphene strip sponge; and (7) adding polydimethylsiloxane and a curing agent to acetone to prepare a polydimethylsiloxane acetone solution, putting the reduced low-defect graphene strip sponge obtained in step (6) into the polydimethylsiloxane acetone solution, leaving still at room temperature under a vacuum condition, then taking out the mixture and curing to obtain the product.