A kind of preparation method of flexible highly conductive graphene film

A graphene film, high conductivity technology, applied in the direction of graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of low material conductivity, complicated preparation process, low density, etc., achieve good flexibility, simple process, The effect of high production efficiency

Active Publication Date: 2019-04-09
哈尔滨赫兹新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems of complex preparation process, poor uniformity, low material conductivity, low compactness and poor flexibility in the existing graphene flexible film preparation method; it provides a new flexible, highly conductive and dense film based on graphene sponge Preparation method of graphene film
In the present invention, graphene oxide is assembled into a three-dimensional porous structure—graphene oxide sponge, which is subjected to heat treatment after chemical reduction, and finally a flexible, highly conductive and dense graphene film is prepared under pressure; thereby solving the problem that the graphene film is flexible and dense at the same time Sexuality, high conductivity

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  • A kind of preparation method of flexible highly conductive graphene film
  • A kind of preparation method of flexible highly conductive graphene film
  • A kind of preparation method of flexible highly conductive graphene film

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specific Embodiment approach 1

[0028] Specific embodiment 1: This embodiment provides a method for preparing a highly conductive flexible composite material by using graphene sponge and polydimethylsiloxane to compound the following steps:

[0029] 1. Preparation of Graphene Oxide: Add 40g of natural flake graphite to the mixed acid and stir under the conditions of 500r / min and 40min. After that, add potassium permanganate in 7 times at 20 min intervals (time interval is 20 min), adjust the stirring temperature and speed to 35℃, 500r / min, and place it in a water bath for constant temperature stirring for 5 hours, then add the stirring mixture To ice water, and add 30% hydrogen peroxide to the ice water to obtain a suspension, and finally filter, centrifuge and wash to obtain graphene oxide. Add 24mg graphene oxide per milliliter to the ratio and deionized water to obtain dispersion liquid.

[0030] The mass ratio of potassium permanganate to the volume of mixed acid is 6g:1L; the mass ratio of natural flake gra...

specific Embodiment approach 2

[0040] Embodiment 2: The method for preparing a flexible and highly conductive graphene film in this embodiment is carried out according to the following steps:

[0041] 1. Preparation of Graphene Oxide: Add 20g of natural flake graphite to sulfuric acid and phosphoric acid to prepare a mixture, stir under the conditions of 500r / min, 40min. Then add potassium permanganate in 7 times at 20 min intervals, adjust the stirring temperature and speed to 35℃, 500r / min, and place it in a water bath for 5h at constant temperature, then add the stirring mixture to ice water and add it to 30% hydrogen peroxide was added to the ice water to obtain a graphene suspension. Finally, the graphene oxide suspension was filtered, centrifuged and washed to obtain graphene oxide, which was diluted to 12 mg / ml with deionized water.

[0042] The mass ratio of potassium permanganate to the volume of mixed acid is 6g:1L; the mass ratio of natural flake graphite to the volume of hydrogen peroxide is 1g:2mL; ...

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Abstract

The invention discloses a method for preparing a flexible high-conductivity graphene film, belongs to the field of graphene films, and aims to solve the technical problems that the size of conventional graphene sponge is limited by equipment and the graphene sponge is poor in flexibility in practical application. The method disclosed by the invention comprises the following steps: I, freezing an oxidized graphene dispersing solution for 10-24 hours at minus 50 DEG C to minus 20 DEG C, and performing freeze-drying for 72-100 hours so as to obtain oxidized graphene sponge; II, reducing the oxidized graphene sponge by using hydrazine hydrate steam; III, in the presence of an inert gas as a protection gas, performing thermal treatment; IV, performing pressurization treatment, thereby obtaining the graphene film. The method disclosed by the invention is simple in process, low in cost, high in production efficiency and good in controllability, a large-size sample can be prepared, different engineering requirements can be met, and the situation that conventional large-size graphene sponge is limited by experiment equipment is solved; in addition, the graphene film which is good in flexibility, high in conductivity and high in density is prepared by using the method.

Description

Technical field [0001] The invention belongs to the field of graphene films; in particular, it relates to a method for preparing flexible and highly conductive graphene films. Background technique [0002] Graphene has only one layer of carbon atoms and is closely packed into a two-dimensional honeycomb lattice structure. Each carbon atom forms a covalent bond with three adjacent carbon atoms. Each carbon atom in graphene has an s orbital and three p orbitals, of which the s orbital and two p orbitals form chemical bonds with the three adjacent carbon atoms, which do not contribute to the conductivity of graphene, and the remaining A p orbital hybridizes with each other to form a valence band and a conduction band, which affect the electrical properties of graphene. This unique two-dimensional structure gives graphene excellent mechanical, electrical and thermal properties. The transmission of free electrons on graphene is not easy to scatter, and the electron mobility can reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19
CPCC01B2204/22C01B2204/32C01P2004/03
Inventor 李宜彬陈若凡赫晓东徐帆林在山彭庆宇
Owner 哈尔滨赫兹新材料科技有限公司
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