▎ 摘　　要

NOVELTY - Method for preparing ultra-short carbon nanotube-graphene composite material, involves (a) obtaining a water-soluble ultra-short carbon nanotube-graphene oxide dispersion by a liquid-phase self-assembly method of an ultra-short carbon nanotube solution with a length of 310-600 nm and a graphene oxide solution, (b) adding the reducing agent c in step (a), and preparing the ultrashort carbon nanotube-graphene composite material under the conditions of a temperature of 60-90 degrees C and a time of 30-120 minutes, where the liquid phase self-assembly method in step (a) comprises (a1) under the condition of 0-5 degrees C, ultrasonically dispersing the ultrashort carbon nanotube dispersion and the graphene oxide dispersion, (a2) continuously adding the ultra-short carbon nanotube dispersion to the graphene oxide dispersion under ultrasonic conditions of 0-5 degrees C, and (a3) continue the ultrasonic self-assembly to obtain the product. USE - The method is used for preparing ultra-short carbon nanotube-graphene composite material, which is used in the fields of thermal management of electronic equipment and thermal energy storage (all claimed). ADVANTAGE - The method is simple, and prepares relatively uniform ultra-short carbon nanotube-graphene composite materials. DETAILED DESCRIPTION - Method for preparing ultra-short carbon nanotube-graphene composite material, involves (a) obtaining a water-soluble ultra-short carbon nanotube-graphene oxide dispersion by a liquid-phase self-assembly method of an ultra-short carbon nanotube solution with a length of 310-600 nm and a graphene oxide solution, where the concentration of the ultra-short carbon nanotube solution 0.25-2 mg/ml, and the concentration of the graphene oxide solution is 0.25-2 mg/ml, (b) adding the reducing agent sodium borohydride in step (a), and preparing the ultrashort carbon nanotube-graphene composite material under the conditions of a temperature of 60-90 degrees C and a time of 30-120 minutes, where the liquid phase self-assembly method in step (a) comprises (a1) under the condition of 0-5 degrees C, ultrasonically dispersing the ultrashort carbon nanotube dispersion and the graphene oxide dispersion, (b) continuously adding the ultra-short carbon nanotube dispersion to the graphene oxide dispersion under ultrasonic conditions of 0-5 degrees C, and (c) after the dripping is completed, continue the ultrasonic self-assembly to obtain the product.