High thermal-conduction nanometer carbon composite material and preparation method thereof

A composite material and nanocarbon technology, applied in the field of material science, can solve the problems of complex preparation process, improved thermal conductivity, poor controllability, etc., and achieve the effect of simple and controllable preparation process, high flexibility, and improved performance

Active Publication Date: 2017-07-14
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] However, in the graphene / carbon nanotube composite material obtained in the prior art, graphene and carbon nanotube are basically a simple physical combination, and fail to form a better synergistic effect, so the thermal conductivity of the composite material is also compared with Less boost from graphene or carbon nanotubes
On the other hand, the preparation process of existing graphene / carbon nanotube composite materials is complex, high energy consumption, and poor controllability

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  • High thermal-conduction nanometer carbon composite material and preparation method thereof
  • High thermal-conduction nanometer carbon composite material and preparation method thereof

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[0044] An embodiment of one aspect of the present invention provides a method for preparing a high thermal conductivity nano-carbon composite material, comprising:

[0045] Provide aggregates formed by aggregation of multiple carbon nanotubes,

[0046] Providing a graphene oxide dispersion, and incorporating the graphene oxide dispersion into the aggregate to form a carbon nanotube / graphene composite precursor;

[0047] The carbon nanotube / graphene composite precursor is placed in a reducing atmosphere and heat-treated at 200-500° C. (preferably 300-350° C.) for more than 15 minutes (preferably more than 30 minutes), and then transferred to a protective atmosphere and Heat treatment at 1500-3000° C. (preferably 2000-3000° C.) for more than 15 minutes.

[0048] More preferably, the concentration of the graphene oxide solution is 0.1-3 mg / ml.

[0049] More preferably, the radial dimension of the graphene oxide is 10nm-1mm, and the thickness is 0.24nm-2nm.

[0050] Further, the ...

Embodiment 1

[0082] Using carbon nanotube continuous film (prepared by floating catalytic method), graphene oxide (average radial size above 0.15 μm, number of sheets about 2-5) as raw material, after carbon nanotube / graphene composite film precursor preparation , the reduction process of carbon nanotube / graphene composite film (the first step of heat treatment) and the second step of heat treatment process of carbon nanotube / graphene composite film to achieve the use requirements of high thermal conductivity, high flexibility and high mechanical properties, The process is as follows:

[0083] A. Preparation of carbon nanotube / graphene composite film precursor

[0084] Dissolve 5mg of graphene oxide powder in 10ml of deionized water and ethanol mixture, the volume ratio of deionized water and ethanol is about 1:1, and after magnetic stirring to obtain graphene oxide suspension, ultrasonic treatment, ultrasonic power 30w, ultrasonic After 5 minutes, a graphene oxide solution with a concent...

Embodiment 2

[0092]Adopt continuous film of carbon nanotubes (prepared by array growth drawing film method), graphene oxide (same as embodiment 1) is raw material, through the preparation of carbon nanotube / graphene composite film precursor, carbon nanotube / graphene composite film The reduction process (the first step of heat treatment) and the second step of heat treatment of carbon nanotube / graphene composite film to meet the requirements of high thermal conductivity, high flexibility and high mechanical properties, the process is as follows:

[0093] A. Preparation of carbon nanotube / graphene composite film precursor

[0094] Dissolve 10mg of graphene oxide powder in 10ml of deionized water and ethanol mixture, the volume ratio of deionized water to ethanol is about 1:1, after magnetic stirring to obtain graphene oxide suspension, ultrasonic treatment, ultrasonic power 30w, ultrasonic After 10 minutes, a graphene oxide solution with a concentration of about 1 mg / ml was obtained.

[009...

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Abstract

The invention discloses a high thermal-conduction nanometer carbon composite material and a preparation method thereof. According to the present invention, mainly the aggregate of a plurality of carbon nano-tubes and graphene oxide attached on the surface of one or the plurality of the carbon nano-tubes in the aggregate are subjected to two-step heat treatment to form the high thermal-conduction nanometer carbon composite material, wherein the first-step heat treatment is performed in a reducing atmosphere and the heat treatment temperature is 200-500 DEG C, and the second-step heat treatment is performed in a protective atmosphere and the heat treatment temperature is 1500-3000 DEG C; compared to the existing carbon nano-tube/graphene composite material, the high thermal-conduction nanometer carbon composite material of the present invention has advantages of significantly-improved thermal conductivity and other performances, high flexibility, high electrical conductivity, excellent mechanical property and the like; and the preparation method has characteristics of simple and controlled preparation process, low energy consumption, and easy scale implementation.

Description

technical field [0001] The invention relates to a nano-carbon composite material and a preparation method thereof, in particular to a high thermal conductivity nano-carbon composite material, such as a high thermal conductivity flexible carbon nanotube / graphene composite film and a preparation method thereof, belonging to the field of material science. Background technique [0002] With the rapid development of high-power micro-nano electronic devices, semiconductor laser displays, and multi-core smartphones and mobile devices, the heat generated by the electronic components of the equipment needs to be evacuated in time to ensure that they can work efficiently and reliably. The most important factor affecting the service life of the device. At present, metal materials (copper, aluminum) and graphite film heat dissipation materials are widely used in the market. The former has low thermal conductivity (copper: aluminum), the latter has poor flexibility and is not resistant t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14C01B32/05
CPCC09K5/14
Inventor 胡东梅李清文李达
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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