Novel liquid-phase oriented preparation method of high-electric-conductive and high-heat-conductive graphene film

A technology of high thermal conductivity graphite and graphene film, applied in metal material coating process, coating, gaseous chemical plating, etc., to achieve good thermal conductivity, advanced technology, and low equipment investment

Active Publication Date: 2015-10-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The present invention aims to overcome the defects of existing graphene preparation methods, and the present in

Method used

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  • Novel liquid-phase oriented preparation method of high-electric-conductive and high-heat-conductive graphene film
  • Novel liquid-phase oriented preparation method of high-electric-conductive and high-heat-conductive graphene film

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[0024] The invention belongs to the field of graphene composite materials. The invention relates to a novel liquid phase method for preparing a graphene film with high electrical conductivity and high thermal conductivity. The method includes: chemically reducing graphene sheets to prepare graphene oxide; physical deposition to prepare highly oriented assembled graphene oxide; reducing graphene oxide through high-temperature chemical deposition and repairing defects; and the repaired graphene is mechanically compressed High-density graphene film. The material used in the present invention is graphite; highly oriented graphene is prepared by a liquid phase method; the preparation of the highly thermally and highly conductive graphene film has originality and positive scientific significance, and can be applied to many fields such as photovoltaics, electrical conductivity, heat dissipation, and the like. The highly conductive and thermally conductive graphene film has a mature pr...

Embodiment 1

[0062] Take out 500mg of dried graphene oxide and disperse it in 200g of aqueous solution to obtain a brownish yellow suspension; put the suspension in an ultrasonic washing box and disperse under ultrasonic conditions for several hours; put the obtained solid substance in a vacuum at 30°C Controlled directional deposition in a drying box for 12 hours; vacuum-filtered the deposited material for 5 hours; vacuum-filtered graphene was reduced to a highly oriented graphene film at 600°C, and pressed into a film at a high pressure of 50MPa. figure 1 The SEM image of the graphene film. figure 2 Raman spectrum of the prepared graphene. The sheet resistance of the graphene film is 0.1Ωsq -1 Thermal conductivity is 850W m -1 K -1 . Compared with comparative example 1, the thermal conductivity is 360W m higher -1 K -1 . Compared with the comparative example 2, the thermal conductivity is 320W m higher -1 K -1 . When the high pressure is increased to 100MPa, other conditions remai...

Embodiment 2

[0066] As described in the first embodiment, the temperature of the vacuum drying oven was controlled to 40° C. for directional deposition for 12 hours, and other conditions remained unchanged.

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Abstract

The invention relates to a novel liquid-phase oriented preparation method of a high-electric-conductive and high-heat-conductive graphene film, wherein the method includes the steps of (1) performing vacuum temperature-controlled oriented deposition to graphene oxide and performing vacuum suction filtration to deposited graphene oxide to obtain an orientedly-deposited graphene oxide film, and (2) reducing the orientedly-deposited graphene oxide film through chemical vapor deposition, and repairing defects in graphene to obtain an orientedly-deposited graphene film; and (3) high-pressure moulding the orientedly-deposited graphene film to obtain the high-electric-conductive and high-heat-conductive graphene film.

Description

Technical field [0001] The invention relates to a method for preparing a graphene film, in particular to a method for preparing a graphene film with high electrical conductivity and high thermal conductivity. Background technique [0002] Since graphene has been successfully separated, its excellent physical properties have attracted widespread interest in the scientific community. As the most conductive material in the world, the speed of electrons in graphene has reached 1 / 300 of the speed of light, which far exceeds the conduction speed of electrons in general conductors. According to its excellent electrical conductivity, and ultra-high thermal conductivity (5600W m -1 K -1 ) It also has huge application potential in the field of microelectronics. In addition, graphene material is also an excellent modifier. Graphene is used as a conductive material to compound with various substances and applied to new energy fields such as photovoltaics, energy storage fields such as lithi...

Claims

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Application Information

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IPC IPC(8): C01B31/04C23C16/26C23C16/44
Inventor 黄富强周密毕辉
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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