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

An isotropic, carbon nanotube technology, applied in the field of preparing three-dimensional carbon materials with high thermal conductivity and compression resilience, can solve problems such as poor mechanical properties, poor bonding force, and unsatisfactory applications, and achieve the goal of improving thermal conductivity Effect

Active Publication Date: 2016-12-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 8ml of the graphene oxide aqueous dispersion into a 10ml hydrothermal reaction kettle, react at 150°C for 12h, and cool to room temperature to obtain a sponge. The samples were quickly frozen and then freeze-dried in a freeze dryer to obtain a three-dimensional graphene sponge.

[0026] 10ml of absolute ethanol, 10ml of xylene, and 4ml of ethylenediamine were prepared into a solution, and 0.48g of ferrocene was dissolved in the above solution to obtain a ferrocene solution with a concentration of 0.02g / ml.

[0027] The prepared three-dimensional graphene sponge is placed in a tube furnace, and the temperature is raised to 700°C under the protection of argon. During the heating process, when the temperature is higher than 400°C, hydrogen is introduced. Under the mixed gas of hydrogen and argon, Inject the above-mentioned ferrocene solution, the injection speed is 10mL / h, the growth time is 30min, stop the injection of the ferrocene solution, and cool to room temperat...

Embodiment 2

[0029] Put 8ml of the graphene oxide aqueous dispersion into a 10ml hydrothermal reaction kettle, react at 180°C for 12h, and cool to room temperature to obtain a sponge. The samples were quickly frozen and then freeze-dried in a freeze dryer to obtain a three-dimensional graphene sponge.

[0030] 10ml of absolute ethanol, 5ml of xylene, and 2ml of ethylenediamine were prepared into a solution, and 0.34g of ferrocene was dissolved in the above solution to obtain a ferrocene solution with a mass fraction of 0.02g / ml.

[0031] Place the prepared three-dimensional graphene sponge in a tube furnace, and raise the temperature to 800°C under the protection of argon. During the heating process, when the temperature is higher than 400°C, hydrogen gas is introduced. Under the mixed gas of hydrogen and argon, inject For the above-mentioned ferrocene solution, the injection speed was 15 mL / h, and the growth time was 30 min. The injection of the ferrocene solution was stopped, and the sam...

Embodiment 3

[0033] Put 8ml of the graphene oxide aqueous dispersion into a 10ml hydrothermal reaction kettle, react at 180°C for 15h, and cool to room temperature to obtain a sponge. The samples were quickly frozen and then freeze-dried in a freeze dryer to obtain a three-dimensional graphene sponge.

[0034]10ml of absolute ethanol, 10ml of xylene, and 4ml of ethylenediamine were prepared into a solution, and 1.2g of ferrocene was dissolved in the above solution to obtain a ferrocene solution with a mass fraction of 0.05g / ml.

[0035] Place the prepared three-dimensional graphene sponge in a tube furnace, raise the temperature to 800°C under the protection of argon, and inject hydrogen when the temperature is higher than 400°C, and inject the above-mentioned ferrocene solution under the mixed gas of hydrogen and argon , the injection speed was 15mL / h, the growth time was 15min, the injection of ferrocene solution was stopped, and the sample was obtained by cooling to room temperature und...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B31/02
CPCC01P2004/03C01P2004/80C01P2006/32
Inventor 封伟张飞冯奕钰
Owner TIANJIN UNIV
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