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Graphene film and preparation method thereof

A graphene film and graphene technology, applied in the field of graphene, can solve the problems of low efficiency of electrospraying cloth, poor thermal conductivity of graphene film, etc., and achieve less structural defects, easy operation and industrialization, and flexibility. Good results

Active Publication Date: 2016-04-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can realize the continuous preparation of graphene film, the efficiency of electrospray coating is low, and the chemical reduction method can only partially repair the structural defects on the surface of graphene oxide, and the thermal conductivity of the obtained graphene film is not good.

Method used

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  • Graphene film and preparation method thereof

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preparation example Construction

[0027] The invention provides a kind of preparation method of graphene thin film, and it comprises the following steps:

[0028] S1, dispersing graphene oxide in a solvent to obtain a mixture;

[0029] S2, pour the mixture into a film-scraping machine and continuously scrape the film at a speed V on a substrate, and send the film layer obtained after scraping the film together with the substrate to a blast oven for drying at a speed V to obtain a strip Graphene oxide film with substrate;

[0030] S3, the graphene oxide film with the substrate is continuously fed into the tube furnace at a speed V and subjected to graphitization treatment under an inert atmosphere to reduce the graphene oxide and repair the structural defects on its surface, and obtain the graphene oxide film with the substrate graphene films; and

[0031] S4, peeling off the substrate in the graphene film with substrate coming out of the tube furnace to obtain a graphene film.

[0032] In step S1, the graph...

Embodiment 1

[0048] Step 1: Add 1 part by weight of heat-expandable graphene oxide powder to 10 parts by weight of water, then stir at high speed and disperse ultrasonically to obtain a thick slurry of graphene oxide with a weight ratio of 1:10.

[0049] Step 2: Pour the thick slurry of graphene oxide prepared in step 1 into the trough of the automatic film scraping machine, adjust the width of the scraper to 10 cm, and the thickness to 100 microns, and then place it on the flexible graphite paper substrate at a rate of 5 m / hour. The film scraping operation is carried out continuously at the same speed, and then sent to the blast drying tunnel at a temperature of 90°C at the same speed for drying treatment to obtain a graphene oxide film with a substrate.

[0050] Step 3: The graphene oxide film with substrate coming out of the drying tunnel in step 2 is continuously sent into a tube furnace filled with inert gas and heated to 2800°C at a speed of 5 m / h for graphitization treatment to reduc...

Embodiment 2

[0054] Step 1: Add 1 part by weight of thermally expandable graphene oxide powder to 10 parts by weight of N,N-dimethylformamide, then stir at high speed and disperse ultrasonically to obtain a thick graphene oxide with a weight ratio of 1:10 slurry.

[0055] Step 2: Pour the thick slurry of graphene oxide prepared in step 1 into the trough of the automatic film scraping machine, adjust the width of the scraper to 10 cm, and the thickness to 200 microns, and then place it on the flexible graphite paper substrate at a rate of 5 m / hour. Continuous film scraping operation at the same speed, and then sent to the blast drying tunnel with a temperature of 140°C at the same speed for drying treatment to obtain a graphene oxide film with a substrate.

[0056] Step 3: The graphene oxide film with substrate coming out of the drying tunnel in step 2 is continuously sent into a tube furnace filled with inert gas and heated to 2000°C at a speed of 5 m / h for graphitization treatment to redu...

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Abstract

The invention relates to a preparation method of a graphene film, which comprises the following steps: (1) dispersing graphene oxide in a solvent to obtain a mixture; (2) pouring the mixture into a knifing machine, carrying out continuous knifing on a substrate at a speed V, and sending the film and substrate into a blast drying tunnel at the speed V to perform drying, thereby obtaining a substrate-bearing graphene oxide film; (3) continuously sending the substrate-bearing graphene oxide film into a pipe furnace at the speed V, and carrying out graphitizing in an inert atmosphere to reduce the graphene oxide and repair the structure defects on the surface, thereby obtaining a substrate-bearing graphene film; and (4) rolling the substrate-bearing graphene film from the pipe furnace, and peeling the substrate to obtain the graphene film. The invention also relates to a graphene film.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a graphene film with excellent thermal conductivity and a preparation method thereof. Background technique [0002] In the current increasing number of electronic devices, such as smartphones, due to their small size, high density of electronic components, and large heat generation, it is necessary to use high thermal conductivity, lightweight, and stable materials to achieve heat dissipation. In practical applications, graphene thermal conductive film with high thermal conductivity, heat resistance and corrosion resistance is an excellent solution. [0003] The currently disclosed graphene heat-conducting film preparation method is mainly prepared by using graphene oxide film as a raw material, and then undergoing chemical or thermal reduction to repair the surface structural defects of graphene oxide. However, most of these methods are batch or semi-continuous, that is, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/22C01B2204/24C01P2004/03
Inventor 沈斌郑文革翟文涛李洋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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