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Preparation method of high thermal conductivity graphene thin film

A technology of high thermal conductivity graphite and graphene film, applied in the direction of graphene, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of destroying graphene's high electron mobility, unfriendly environment, etc. Achieve the effect of environmental friendliness, low energy consumption and high thermal conductivity

Inactive Publication Date: 2014-05-21
福建省辉锐材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the redox process, its conductivity is only partially reduced (destroying the high electron mobility of graphene itself), and a large amount of acid and alkali discharges are generated during the preparation process, which is not environmentally friendly.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] The implementation process of graphene material preparation method in the present embodiment is as follows:

[0035] Take 1g of 50-mesh expandable graphite and place it in a metal or ceramic crucible, under the protection of inert gas, heat to 900 degrees to achieve full expansion, and then cool to room temperature. Gained expanded graphite is placed in a container, poured into 250ml NMP, and stirred evenly. The resulting expanded graphite NMP mixed solution was vibrated for 16 hours under the condition of an ultrasonic oscillation power of 1200W, while being heated to 80°C. A suspension of graphene microflakes was obtained. The obtained graphene suspension is filtered by a positive pressure filter device or a vacuum filter device, and dried at 30-100 degrees to obtain a graphene film. The thickness of the obtained film is 20-2000 microns, and the thermal conductivity of the obtained graphene film can be as high as 600W / m-K.

Embodiment 2

[0037] The implementation process of graphene material preparation method in the present embodiment is as follows:

[0038] Take 1g of expandable graphite and place it in a ceramic crucible or glass vessel, and heat it with a microwave at 1000W for 30 seconds. Allow for full expansion, then cool to room temperature. Gained expanded graphite is placed in a container, poured into 250ml NMP, and stirred evenly. The resulting expanded graphite NMP mixed solution was vibrated for 16 hours under the condition of an ultrasonic oscillation power of 1200W, while being heated to 80°C. A suspension of graphene microflakes was obtained. The obtained graphene suspension is filtered by a positive pressure filter device or a vacuum filter device, and dried at 30-100 degrees to obtain a graphene film. The thickness of the obtained film is 20-2000 microns, and the thermal conductivity of the obtained graphene film can be as high as 600W / m-K.

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Abstract

The invention relates to the technical field of an organic semiconductor material, and provides a preparation method of a high thermal conductivity graphene thin film. The preparation method comprises the following steps: preparing expanded graphite; mixing the obtained expanded graphite and an organic solvent; carrying out ultrasound dissociation on an expanded graphite organic solvent mixed liquid so as to obtain a graphene microchip suspension liquid; and preparing a graphene thin film by using the graphene microchip suspension liquid. The preparation method has the following advantages that the preparation method is suitable for low-cost industrial large-scale production of the high thermal conductivity graphene thin film, does not refer to high temperature and high pressure and is low in energy consumption; the oxidation-reduction process is not adopted, the lattice structure of the graphene is not damaged, and the obtained product has high thermal conductivity; and meanwhile, as the oxidation-reduction process is not adopted, acid-base or other poisonous effluent is not generated, and the organic solvent can be repeatedly used and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of organic semiconductor materials, and in particular relates to a preparation method of a graphene film with high thermal conductivity. Background technique [0002] Thermally conductive graphite sheet, also known as graphite heat sink, is a brand-new heat-conducting and heat-dissipating material. It has a unique grain orientation and conducts heat evenly in two directions. The lamellar structure can well adapt to any surface and shield heat sources and components. Improves the performance of consumer electronics and is an excellent material choice for thermal management solutions. The thermally conductive graphite sheet has ultra-high thermal conductivity in the range of 150-1500W / m-K in the plane. The chemical composition of thermally conductive graphite material (Thermal Flexible Graphite sheet) is mainly a single carbon element. [0003] At present, high thermal conductivity graphite sheets are mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00C01B32/19C01B32/194
Inventor 林朝晖
Owner 福建省辉锐材料科技有限公司
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