Preparation method of three-dimensional graphene/carbon nano tube composite material having isotropic high heat conduction and elasticity

Abstract

The invention relates to a three-dimensional graphene sponge body / carbon nano tube composite material having isotropic high heat conduction and elasticity, and a preparation method of the material. In the preparation method, a water dispersion body of graphene oxide is prepared by expanding and oxidizing natural graphite, thereby forming a three-dimensional porous appearance through a hydrothermal reaction; ferrocene, as a catalyst, is used for growing the carbon nano tubes, wherein the ferrocene is decomposed at a high temperature into iron atoms which are adhered onto the surface of the graphene sponge body. Carbon atoms, which are formed by cracking a carbon source, are adhered onto the surface of the graphene by means of the iron atoms, thus growing the carbon nano tubes. Through control on injection speed and temperature maintaining time of the carbon source liquid, growth of the carbon nano tubes is controllable. The carbon nano tubes grow in the internal pores of the graphene sponge body and are connected to graphene mutually, thus obtaining the isotropic heat conduction and elasticity. The composite material has the isotropic heat conduction and is not less than 10 W / (m*K) in heat conduction coefficient, and has the same compression rebound elasticity in all directions, rebound rate being more than 90% under compression of 20%.

Description

technical field [0001] The invention relates to a method for preparing a three-dimensional carbon material with high thermal conductivity and compression resilience, in particular a method for preparing a three-dimensional graphene sponge and carbon nanotube composite material with isotropic high thermal conductivity and elasticity. Background technique [0002] With the rapid development of science and technology, heat conduction and heat dissipation have become a key issue in the mechanical and electronic industries. With the continuous strengthening and upgrading of electrical equipment such as large computers, personal computers, and mobile phones, the integration of electronic components is higher, and the heat generated per unit area continues to increase. If the heat is not transferred out in time, the accumulation of heat will cause electronic components. The premature aging and damage will affect the performance and service life of the equipment. Traditional metal ...

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Problems solved by technology

CN104445173A has introduced the composite material that utilizes hydrothermal reaction to prepare carbon nanotube and graphene, carbon nanotube and graphene oxide foam are mixed, and then reduced to make again, in this material, carbon nanotube and graphene are connected by van der Waals force , the binding force is very poor, the mechanical properties are poor, and the material is easily damaged when compressed, which cannot meet the practical application

The above published literature mainly prepares adsorption materials, and there are few research reports on how to prepare three-dimensional composite materials of graphene and carbon nanotubes with high thermal conductivity.

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