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Preparation method of in-situ growth graphene composite carbon material of graphite sheet

A graphene composite and in-situ growth technology, which is applied in the field of high thermal conductivity materials and composite carbon materials, can solve the problems of reducing the performance of composite reinforcements, easy agglomeration of carbon nanotubes, and difficult growth direction of carbon nanotubes. The effect of simple process

Active Publication Date: 2019-10-18
深圳市优越新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned patents have the following deficiencies: 1. The growth of carbon nanotubes is highly dependent on the distribution of nanocatalysts, and it is difficult to achieve uniform distribution of nanocatalysts, which leads to the easy aggregation of carbon nanotubes and reduces the performance of the entire composite reinforcement. 2. Carbon nanotubes The growth direction of the tube is difficult to adjust to the vertical direction, which is not conducive to the construction of vertical heat conduction channels

Method used

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  • Preparation method of in-situ growth graphene composite carbon material of graphite sheet
  • Preparation method of in-situ growth graphene composite carbon material of graphite sheet

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Effect test

Embodiment 1

[0027] This embodiment provides a method for preparing a graphene composite carbon material grown in situ on a graphite sheet, comprising the following steps:

[0028] 1) Surface treatment of natural graphite flakes: Wash and dry the natural graphite flakes with a diameter of 500 μm in absolute ethanol, acetone and deionized water respectively.

[0029] 2) High-temperature surface treatment of natural graphite flakes: the natural graphite flakes were heated to 800°C at a rate of 15°C / min in an ambient atmosphere of 400sccm argon and 300sccm hydrogen, and kept for 10 minutes to further remove impurities and reduce the surface.

[0030] 3) GNP growth: 20sccm methane gas was introduced to provide the carbon source required for growth. At this time, the flow rate of hydrogen was 500sccm, and the flow rate of argon was 100sccm. This process was maintained for 6h.

[0031] In the present embodiment, the test of graphite flake in-situ growth graphene composite carbon material graphen...

Embodiment 2

[0034] This embodiment provides a method for preparing a graphene composite carbon material grown in situ on a graphite sheet, comprising the following steps:

[0035] 1) Surface treatment of natural graphite flakes: the natural graphite flakes with a graphite flake diameter of 700 μm were washed and dried in absolute ethanol, acetone and deionized water respectively.

[0036] 2) High-temperature surface treatment of natural graphite flakes: the natural graphite flakes were heated up to 800°C at a rate of 5°C / min in an atmosphere of 400sccm argon and 200sccm hydrogen and held for 10 minutes to further remove impurities and reduce the surface.

[0037] 3) GNP growth: 30 sccm methane gas was introduced to provide the carbon source required for growth. At this time, the flow rate of hydrogen was 100 sccm, and the flow rate of argon was 500 sccm. This process was maintained for 6 hours.

[0038] In the present embodiment, the test of graphene growth ratio of graphite flake in situ...

Embodiment 3

[0041] This embodiment provides a method for preparing a graphene composite carbon material grown in situ on a graphite sheet, comprising the following steps:

[0042] 1) Surface treatment of natural graphite flakes: Wash and dry the natural graphite flakes with a diameter of 1000 μm in absolute ethanol, acetone and deionized water respectively.

[0043] 2) High-temperature surface treatment of natural graphite flakes: the natural graphite flakes were heated to 1000°C at a rate of 20°C / min in an ambient atmosphere of 500sccm argon and 500sccm hydrogen and kept for 60min to further remove impurities and reduce the surface.

[0044] 3) GNP growth: 100 sccm of methane gas was introduced to provide the carbon source required for growth. At this time, the flow rate of hydrogen was 500 sccm, and the flow rate of argon was 500 sccm. This process was maintained for 16 hours.

[0045] In the present embodiment, the test of graphite flake in-situ growth graphene composite carbon materia...

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Abstract

The invention provides a preparation method of in-situ growth graphene composite carbon material of a graphite sheet. The preparation method includes the steps that S1, the surface of the graphite sheet is treated, specifically, impurities on the surface of the graphite sheetare are removed; S2, high-temperature reduction and further removal of the impurities are carried out on the surface of thegraphite sheet, specifically, the graphite sheet is heated up in the atmosphere of argon and hydrogen, the temperature rises to a set temperature, and heat preservation is carried out for a period oftime; and S3, the growth of grapheme is carried out, specifically, methane gas is introduced for providing a carbon source needed for the growth of the grapheme, and the graphene composite carbon material is obtained. According to the preparation method, the process is simple, and a large amount of the graphene can be grown on the surface of the graphite sheet without catalysts; and through the preparation method, the growth morphology of the graphene can be adjusted and controlled, the flow rate and growth time of various gases need to be changed independently, and the adjustment and controlis very convenient.

Description

technical field [0001] The invention relates to the field of composite carbon materials and high thermal conductivity materials, in particular to a method for preparing a graphene composite carbon material grown in situ on a graphite sheet and regulating the morphology of GNPs grown on the surface of a graphite sheet. Background technique [0002] Due to the rapid development of electronic information, the electronic devices used also tend to be miniaturized, highly integrated, and high-power, which requires continuous improvement of the heat dissipation performance of materials. In recent years, natural graphite sheets, carbon fibers, graphene, carbon nanotubes, etc. have received great attention due to their excellent properties of light weight, high thermal conductivity, and low expansion. Using these materials as reinforcements for composite materials can greatly improve The thermal conductivity of the base material and the reduction of the thermal expansion coefficient ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/186C01B32/21
CPCC01B32/186C01B32/21
Inventor 欧阳求保王超宇
Owner 深圳市优越新材料有限公司
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