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Thermal conductive graphene thin film and preparation method thereof

A technology of conductive graphite and graphene, which is applied in chemical instruments and methods, cable/conductor manufacturing, conductive layers on insulating carriers, etc., can solve the problem of poor mechanical properties of graphene films, difficulties in preparing graphene films, and mechanical properties of graphene films. Performance and thermal and electrical conductivity can not meet the rapid development of electronic technology and other issues, to achieve the effect of improving mechanical properties and thermal and electrical conductivity, eliminating defects, and improving structural compactness

Active Publication Date: 2019-04-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, despite the high-temperature graphitization treatment and mechanical molding, it is still difficult to prepare graphene films with ultra-high thermal and electrical conductivity. The thermal conductivity of graphene films is limited to 1700W / mK, and the electrical conductivity The rate is limited to 10000S / cm, and at the same time, due to the destruction of the film sheet structure by the volatile gas during the graphitization process, the mechanical properties of the graphene film are poor and are limited to within 100MPa
The mechanical properties and thermal and electrical properties of graphene films cannot meet the needs of the rapid development of electronic technology

Method used

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  • Thermal conductive graphene thin film and preparation method thereof
  • Thermal conductive graphene thin film and preparation method thereof
  • Thermal conductive graphene thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1), take 3g of graphite flakes with an average size of 200 μm, add 3g of chromium trioxide, 30ml of hydrochloric acid, wash at room temperature for 0.5h, add 15ml of hydrogen peroxide to react for 0.5h and vacuum dry for 1h to obtain expanded graphite;

[0036] Step 2) Take 1g of expanded graphite, add 50ml of concentrated sulfuric acid and 50ml of phosphoric acid, stir at a low temperature of 0°C for 5min, then add 1g of potassium permanganate, and react at 0°C for 1h;

[0037] Step 3), add 100ml of ice water, and add 5ml of hydrogen peroxide to react for 5min, add 5ml of hydrochloric acid to react for 1h, centrifuge to remove the acid solution, wash with deionized water until the pH is 6-7, and stir magnetically at room temperature for 0.5h to obtain Graphene oxide aqueous solution with an average size of 120-150 μm.

Embodiment 2

[0039] Step 1), take 3g of flake graphite with an average size of 500 μm, add 30g of chromium trioxide, 200ml of hydrochloric acid, wash it after reacting at room temperature for 1h, add 500ml of hydrogen peroxide to react for 6h, and vacuum dry for 12h to obtain expanded graphite;

[0040] Step 2) Take 1g of expanded graphite, add 120ml of concentrated sulfuric acid and 60ml of phosphoric acid, stir at a low temperature of 10°C for 120min, then add 15g of potassium permanganate, and react at 50°C for 12h;

[0041] Step 3), add 600ml of ice water, and add 200ml of hydrogen peroxide to react for 120min, add 100ml of hydrochloric acid to react for 24h, centrifuge to remove the acid solution, wash with deionized water until the pH is 6-7, and stir magnetically at room temperature for 24h to obtain the average Graphene oxide aqueous solution with a size of 120-150 μm.

Embodiment 3

[0043] Step 1), take 3g flake graphite with an average size of 1000 μm, add chromium trioxide 90g, hydrochloric acid 300ml, wash clean after reacting at room temperature for 5h, add hydrogen peroxide 900ml to react for 96h, and vacuum dry for 96h to obtain expanded graphite;

[0044]Step 2) Take 1g of expanded graphite, add 500ml of concentrated sulfuric acid and 500ml of phosphoric acid, stir at a low temperature of 5°C for 480min, then add 90g of potassium permanganate, and react at 100°C for 96h;

[0045] Step 3), add 2500ml of ice water, and add 500ml of hydrogen peroxide to react for 480min, add 200ml of hydrochloric acid to react for 96h, centrifuge to remove the acid solution, wash with deionized water until the pH is 6-7, and stir magnetically at room temperature for 48h to obtain the average Graphene oxide aqueous solution with a size of 120-150 μm.

[0046] The embodiment that prepares thermally conductive graphene film has:

[0047] Example 1

[0048] Step 1, prep...

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Abstract

The invention discloses a thermal conductive graphene thin film and a preparation method thereof. The thermal conductive graphene thin film is made by blending a dopamine hydrochloride-Tris buffer solution and a graphene solution, the thin film is formed by stacking graphene sheets, carbon nanoparticles formed after polydopamine is carbonized are uniformly distributed in the graphene sheets and between the sheets, and the graphene sheets and the carbon nanoparticles are crosslinked together. The preparation method comprises the steps that a prepared graphene oxide water solution is mixed witha dopamine hydrochloride-Tris buffer solution, a graphene oxide-polydopamine water solution is taken for preparing the thin film through vacuum assistance, reduction is conducted by means of a reducing agent, the thin film obtained after reduction is heated to 800-1,000 DEG C for heat preservation under the argon atmosphere, then heating is conducted to 2,800-3,000 DEG C for heat preservation, cooling is conducted naturally to reach room temperature, and mechanical mold pressing is conducted on the graphitized graphene thin film. The thermal conductive graphene thin film has the high mechanical property and high thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a graphene film with high strength and high thermal conductivity and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, electronic devices such as mobile phones and notebook computers continue to be miniaturized and portable. Electronic equipment will generate a lot of heat during operation, and the heat needs to be quickly transferred from the electronic equipment to the air, otherwise it will seriously affect the normal operation of the electronic equipment and shorten the service life of the electronic equipment. Therefore, for ultra-thin high The demand for thermally conductive materials is increasing day by day. At the same time, a large number of electromagnetic waves are emitted during the operation of electronic equipment. On the one hand, these electromagnetic waves will cause electromagneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622C01B32/198H05K7/20H01B5/14H01B1/04H01B13/00
CPCH05K7/2039H01B1/04H01B5/14H01B13/00C01B32/198C04B35/522C04B35/532C04B35/62218C04B2235/77C04B2235/96C04B2235/9607
Inventor 邹锐胡宁宁慧铭刘峰
Owner CHONGQING UNIV
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