▎ 摘　　要

NOVELTY - Preparing high dielectric titanium carbide/graphene oxide composite film material comprises e.g. adding natural graphite and potassium permanganate to a mass fraction of 98 wt.% sulfuric acid, stirring in an ice bath and stirring speed of 300-400 revolutions/minute for 1-2 hours to obtain a mixture A, heating the mixture A to 35 degrees C for 1 hour, adding deionized water to the mixture A, heating the mixture added with deionized water to 90-95 degrees C for 30-35 minutes to obtain a mixture B, naturally cooling the mixture B to room temperature, adding 35% hydrogen peroxide to the mixture B, reacting at a stirring speed of 100-300 revolutions/minute for 10 minutes at room temperature to obtain an aqueous graphene oxide solution, centrifuging the aqueous graphene oxide solution at a centrifugal speed of 3000-3500 revolutions/minute, and taking the supernatant liquid, centrifuging the supernatant liquid at a centrifugal speed of 8000-8500 revolutions/minute, and taking out precipitated material. USE - The method is useful for preparing high dielectric titanium carbide/graphene oxide composite film material. ADVANTAGE - The film material has good heat resistance and high dielectric constant. DETAILED DESCRIPTION - Preparing high dielectric titanium carbide/graphene oxide composite film material comprises (i) adding natural graphite and potassium permanganate to a mass fraction of 98 wt.% sulfuric acid, stirring in an ice bath and stirring speed of 300-400 revolutions/minute for 1-2 hours to obtain a mixture A, the mass ratio of natural graphite to potassium permanganate is 1:5, the volume ratio of the natural graphite to the mass fraction of sulfuric acid having a mass fraction of 98% is 1 g: 60-100 ml, (ii) heating the mixture A to 35 degrees C for 1 hour, adding deionized water to the mixture A, heating the mixture added with deionized water to 90-95 degrees C for 30-35 minutes to obtain a mixture B, where the volume ratio of the mixture A to deionized water is 1:1, (iii) naturally cooling the mixture B to room temperature, adding 35% hydrogen peroxide to the mixture B, reacting at a stirring speed of 100-300 revolutions/minute for 10 minutes at room temperature to obtain an aqueous graphene oxide solution, centrifuging the aqueous graphene oxide solution at a centrifugal speed of 3000-3500 revolutions/minute, and taking the supernatant liquid, centrifuging the supernatant liquid at a centrifugal speed of 8000-8500 revolutions/minute, taking out precipitated material, freeze-drying at -80 degrees C for 20 to 24 hours to obtain a graphene oxide powder, the volume ratio of the natural graphite to the volume ratio of the hydrogen peroxide solution having a mass fraction of 35% is 1 g: (5-6 ml), dissolving the graphene oxide powder in water to obtain a graphene oxide solution, the concentration of the graphene oxide solution is 5-15 g/l, centrifuging the graphene oxide solution at a centrifugal speed of 4000-5000 revolutions/minute, taking the supernatant liquid, centrifuging the supernatant liquid at 9000-10000 revolutions/minute, centrifuging again at the centrifugation speed to obtain the lower layer precipitate, adding deionized water to the lower layer precipitate obtained after centrifugation, and stirring for 10-30 minutes at a stirring speed of 100-500 revolutions/minute to obtain a graphene oxide solution having a uniform size distribution, the concentration of the graphene oxide solution having a uniform size is 5-10 g/l, and the size of the graphene oxide in the graphene oxide solution having a uniform size distribution is 1-50 mu m, (iv) adding titanium aluminum carbide (Ti3AlC2) to concentrated sulfuric acid with a mass fraction of 98%, stirring the reaction for 0.5-2 hours at a stirring speed of 100-300 revolutions/minute, adding lithium fluoride powder, carrying out the reaction at 35-50 degrees C for 10-14 hours to obtain a reaction liquid, the volume ratio of the mass of the Ti3AlC2 and the concentration of the concentrated sulfuric acid having a mass fraction of 98% is (2-4 g):30 ml, the volume ratio of the mass of the lithium fluoride powder and the concentrated sulfuric acid having a mass fraction of 98% is (0.5-2 g):30 ml, cooling the reaction solution to room temperature, centrifuging at a centrifugal speed of 6000-8000 revolutions/minute for 10-20 minutes, and removing the supernatant to obtain a solid substance, washing the solid substance twice or four times with distilled water, washing with absolute ethanol until the pH of the washing liquid is neutral, adding N,N-dimethylacetamide to the cleaned solid material, ultrasonically under the protection of argon and ultrasonic power of 100-500 W for 3-5 hours, centrifugal speed of 3000-4000 revolutions/minute, centrifuging for 10-20 minutes, taking the supernatant, centrifuging at a centrifuge speed of 10000 revolutions/minute for 10 minutes, taking the precipitated material, adding deionized water to the precipitate, stirring at a speed of 300-500 revolutions/minute for 10-30 minutes to obtain a uniformly distributed titanium carbide nanosheet solution, the volume ratio of Ti3AlC2 to the N,N-dimethylacetamide is (2g-4g): 100 ml, the concentration of the titanium carbide nanosheet in the solution is 1-2 g/l, and the size is from 0.3-2 mu m, (iv) mixing the titanium carbide nanosheet solution with uniform size distribution and the graphene oxide solution with uniform size distribution, and stirring the reaction at room temperature for 300-500 revolutions/minute for 10-14 hours, the ultrasonic power is 500-1000 W ultrasonic for 20-40 minutes to obtain a mixed solution of titanium carbide and graphene oxide, the volume ratio of the uniformly distributed titanium carbide nanosheet solution and the uniform size of the graphene oxide solution is (1-7): (14-20), and adding the mixed solution of titanium carbide and graphene oxide to the Buchner funnel with the filter paper fixed, filtering it at room temperature by vacuum filtration device, filtering at a vacuum of 0.2-0.5 MPa for 10-20 hours, and naturally drying at room temperature.