Preparation method of high-heat-conduction flexible graphene film

A graphene film, flexible graphite technology, applied in the field of materials science, can solve the problems of high cost, low thermal conductivity, complex preparation process, etc., and achieve the effect of easy large-scale industrial production

Inactive Publication Date: 2017-05-10
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the invention provides a kind of preparation method of highly thermally conductive flexible graphene film, and the preparation method of described this highly thermally conductive flexible graphene film will solve the problem of graphene heat conduction in the prior art. The technical problems of complex film preparation process, low thermal conductivity and high cost

Method used

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  • Preparation method of high-heat-conduction flexible graphene film
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  • Preparation method of high-heat-conduction flexible graphene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Ultrasonic disperse 300 mg of freeze-dried graphene oxide into 1000 ml of ethanol solvent to prepare a graphene oxide dispersion with a concentration of 0.3 mg / mL, and ultrasonically mix it evenly.

[0026] 2) Add the graphene oxide dispersion liquid into the spraying device, adjust the height and power of the nozzle, and spray on the copper foil substrate to form a film; The thickness of the film is 5-120 μm;

[0027] 3) The graphene oxide film is peeled off from the sprayed substrate.

[0028] 4) After rolling the graphene oxide film with a pressure of 15 MPa, under the condition of nitrogen protection, the temperature is gradually raised to 1000° C. for carbonization.

[0029] 5) Finally, put the film into a high-temperature graphitization furnace, raise the temperature to 2800° C., and keep it warm for 45 minutes. A graphene film was prepared with an in-plane thermal conductivity of 1206W m -1 K -1 , and has good flexibility, no damage after repeated bending...

Embodiment 2

[0031] 1) Ultrasonic disperse 300 mg of freeze-dried graphene oxide into 100 ml of DMF solvent to prepare a graphene oxide dispersion with a concentration of 3 mg / mL, and ultrasonically mix it uniformly.

[0032] 2) Add the graphene oxide dispersion into the spraying device, adjust the height and power of the nozzle, and spray the film on the glass substrate; The thickness of the film is 5-120 μm;

[0033] 3) The graphene oxide film is peeled off from the sprayed substrate.

[0034] 4) After the graphene oxide film is rolled with a pressure of 10 MPa, under the condition of nitrogen protection, the temperature is gradually raised to 1200° C. for carbonization.

[0035] 5) Put the final film into a high-temperature graphitization furnace, raise the temperature to 2800° C., and keep it warm for 45 minutes. A graphene film was prepared with an in-plane thermal conductivity of 1475W m -1 K -1 , and has good flexibility, no damage after repeated bending.

Embodiment 3

[0037] 1) Ultrasonic disperse 300 mg of freeze-dried graphene oxide into 50 mL of deionized water solvent to prepare a graphene oxide dispersion with a concentration of 6 mg / mL, and ultrasonically mix it uniformly.

[0038] 2) Add the graphene oxide dispersion liquid into the spraying device, adjust the height and power of the nozzle, and spray on the copper foil substrate to form a film; The thickness of the film is 5-120 μm;

[0039] 3) The graphene oxide film is peeled off from the sprayed substrate.

[0040] 4) After rolling the graphene oxide film at a pressure of 20 MPa, under the protection of argon, the temperature is gradually raised to 1200° C. for carbonization.

[0041] 5) Finally, put the film into a high-temperature graphitization furnace, raise the temperature to 2800° C., and keep it warm for 90 minutes. A graphene film was prepared with an in-plane thermal conductivity of 1509W m -1 K -1 , and has good flexibility, no damage after repeated bending.

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Abstract

The invention provides a preparation method of a high-heat-conduction flexible graphene film. Oxidized graphene powder is frozen, dried and dispersed in a solvent, and an oxidized graphene dispersion liquid with the concentration being 0.1-10 mg/ml is obtained; the oxidized graphene dispersion liquid is added to a spraying device and sprayed on a substrate, the substrate is heated at the temperature of 50-150 DEG C for 0.5-5 h, and the oxidized graphene film is formed on the substrate after the dispersion liquid is evaporated; the oxidized graphene film is peeled off and rolled; hot-pressing carbonization and high-temperature graphitization are performed under the protection of a protective atmosphere, and the heat-conduction graphene film is obtained. With the adoption of the method, the high-heat-conduction flexible graphene film with the size and the thickness being controllable can be effectively prepared to meet requirements of different heat dissipation devices and can be applied to various wearable equipment, smart phones, smart televisions and LEDs on a large scale to improve the heat dissipation effect.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a film, in particular to a preparation method of a highly thermally conductive flexible graphene film. Background technique [0002] With the high integration and high power of electronic components, heat dissipation has become an important factor restricting the development of electronic components. Due to its unique two-dimensional honeycomb lattice structure, graphene has a very high lateral thermal conductivity due to its single-layer or multi-layer graphite structure. The thermal conductivity in a single-layer graphene sheet has been measured to be 5300 W m -1 K -1 . In addition to its high thermal conductivity, graphene thermally conductive film also has good stability at high temperatures and can be used as an efficient heat dissipation material. Most of the existing heat conduction films are graphite and polyimide, or graphene-graphite composite heat dissipation films....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C09K5/14
CPCC09K5/14C01B2204/24
Inventor 邱汉迅宋凌志闫廷龙李幸娟徐鹏杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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