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A kind of preparation method of low-defect graphene film based on graphene foam

A technology of graphene film and graphene foam, which is applied in the field of material science to achieve the effect of improving dispersion, low cost and simple process

Active Publication Date: 2022-03-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the existing graphene film in terms of mechanical properties and electrical and thermal conductivity, the invention provides a method for preparing a low-defect graphene film based on graphene foam

Method used

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  • A kind of preparation method of low-defect graphene film based on graphene foam
  • A kind of preparation method of low-defect graphene film based on graphene foam
  • A kind of preparation method of low-defect graphene film based on graphene foam

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Embodiment 1

[0031] In this embodiment, as image 3 As shown, the preparation method of the low-defect graphene film based on graphene foam is specifically carried out according to the following steps:

[0032] Step 1, prepare graphene oxide aqueous solution:

[0033] Measure 20 mL of graphene oxide slurry with a concentration of 20 mg / mL, add deionized water; under the condition of a stirring speed of 700 r / min, stir for 60 min; then, under the condition of a frequency of 100 KHz, carry out ultrasonic treatment for 30 min to obtain oxidized A graphene oxide aqueous solution with a graphene concentration of 5 mg / mL.

[0034] Step 2, the preparation of anisotropic graphene oxide frozen foam:

[0035] Anisotropic graphene oxide frozen foams with different shapes were obtained by directional freezing of graphene oxide aqueous solution with liquid nitrogen.

[0036] Step 3, the preparation of anisotropic graphene oxide foam:

[0037] with CO2 Anisotropic graphene oxide frozen foam is obtai...

Embodiment 2

[0048] In the present embodiment, the preparation method of the low-defect graphene film based on graphene foam is specifically carried out according to the following steps:

[0049] Step 1, prepare graphene oxide aqueous solution:

[0050] Measure 20 mL of graphene oxide slurry with a concentration of 20 mg / mL, add deionized water; under the condition of a stirring speed of 700 r / min, stir for 60 min; then, under the condition of a frequency of 100 KHz, carry out ultrasonic treatment for 30 min to obtain A graphene oxide aqueous solution with a graphene oxide concentration of 5 mg / mL.

[0051] Step 2, the preparation of anisotropic graphene oxide frozen foam:

[0052] Anisotropic graphene oxide frozen foams with different shapes were obtained by directional freezing of graphene oxide aqueous solution with liquid nitrogen.

[0053] Step 3, the preparation of anisotropic graphene oxide foam:

[0054] with CO 2 Anisotropic graphene oxide frozen foam is obtained by supercriti...

Embodiment 3

[0063] In the present embodiment, the preparation method of the low-defect graphene film based on graphene foam is specifically carried out according to the following steps:

[0064] Step 1, prepare graphene oxide aqueous solution:

[0065] Measure 20 mL of graphene oxide slurry with a concentration of 20 mg / mL, add deionized water; under the condition of a stirring speed of 700 r / min, stir for 60 min; then, under the condition of a frequency of 100 KHz, carry out ultrasonic treatment for 30 min to obtain A graphene oxide aqueous solution with a graphene oxide concentration of 5 mg / mL.

[0066] Step 2, the preparation of anisotropic graphene oxide frozen foam:

[0067] Anisotropic graphene oxide frozen foams with different shapes were obtained by directional freezing of graphene oxide aqueous solution with liquid nitrogen.

[0068] Step 3, the preparation of anisotropic graphene oxide foam:

[0069] with CO 2 Anisotropic graphene oxide frozen foam is obtained by supercriti...

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Abstract

The invention discloses a method for preparing a low-defect graphene film based on graphene foam. The method comprises the following steps: step 1, preparation of anisotropic graphene oxide frozen foam; step 2, anisotropic graphene oxide Preparation of foam; step 3, reduction of graphene oxide film; step 4, preparation of graphene carbon film; step 5, preparation of low-defect graphene film based on graphene foam. The invention has simple process and low cost, adopts graphene oxide as a raw material, has a large and adjustable sheet area, and the continuous sheet structure reduces the grain boundary scattering of phonons in the transmission process, which is beneficial to the improvement of thermal conductivity. The invention can prepare a graphene foam-based low-defect graphene film with uniform graphene dispersion, high thermal conductivity and high mechanical strength with certain flexibility, and adapts to the development needs of current science and technology.

Description

technical field [0001] The invention belongs to the technical field of material science, and relates to a preparation method of a graphene foam-based low-defect graphene film. Background technique [0002] Graphene is another stable nano-carbon element after fullerene and carbon nanotube. It is an idealized two-dimensional planar material with excellent electrical, mechanical and thermal properties. The transport of free electrons on graphene is not prone to scattering, and the electron mobility can reach 2×10 5 cm / V s, more than 100 times the electron mobility in silicon; its conductivity is as high as 10 6 S / m, is an excellent conductive material at room temperature. The elastic modulus of graphene is as high as 1 TPa, the fracture strength is 125 GPa, and the room temperature thermal conductivity is 5.3 × 10 3 W / m·K, the specific surface area is 2630 m 2 / g. Graphene also has excellent optical properties. The visible light absorption rate of single-layer graphene i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184C01B32/198
CPCC01B32/184C01B32/198C01B2204/22C01B2204/24C01B2204/26
Inventor 祝越彭庆宇赫晓东
Owner HARBIN INST OF TECH