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Preparation method of graphene airgel, fe 3 o 4 /Graphene airgel and preparation method thereof

A graphene airgel and gel technology, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve problems such as poor structural integrity and low electrical conductivity

Active Publication Date: 2021-04-13
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene airgel produced by this method has more defects and poor structural integrity, so the electrical conductivity is lower

Method used

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  • Preparation method of graphene airgel, fe <sub>3</sub> o <sub>4</sub> /Graphene airgel and preparation method thereof
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  • Preparation method of graphene airgel, fe <sub>3</sub> o <sub>4</sub> /Graphene airgel and preparation method thereof

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Effect test

preparation example Construction

[0027] The preparation method of graphene airgel comprises the steps:

[0028] S10, preparing the silica porous framework:

[0029]S110, mixing the silicon source material and the phase separation inducer for acid hydrolysis to obtain a first hydrolyzate. In detail, silicon source material, acid, water (H 2 O) and the phase separation inducer are mixed sequentially according to the mass ratio of (6~10):(0.5~1.5):(8~12):(0.5~1), and the temperature is 0~15°C. Acid hydrolysis yields the first hydrolyzate.

[0030] Wherein, the silicon source material includes at least one of ethyl orthosilicate, methyl orthosilicate, methyltriethoxysilane and methyltrimethoxysilane, as long as it can be hydrolyzed to obtain silicon dioxide. The phase separation inducer includes polyethylene oxide, polyvinyl polypyrrolidone or polyacrylamide. Through the use of the phase separation inducer, the phase separation reaction of the homogeneous silicon-containing aqueous solution can occur under cer...

Embodiment 1

[0060] The preparation method of graphene airgel comprises the steps:

[0061] (1), tetraethyl orthosilicate (TEOS), nitric acid (HNO 3 ), water (H 2 O) and polyethylene oxide (PEO) are mixed sequentially according to the mass ratio of 8.5:1:10:0.8, and acid hydrolysis is carried out at a temperature of 0° C. to obtain the first hydrolyzate. Wherein, the molecular weight of polyethylene oxide (PEO) is 10,000.

[0062] (2) Pour the first hydrolyzate into a plastic mold and place it in an incubator at 60° C. to fully react for at least three days to obtain a silica skeleton.

[0063] (3) After washing the silica skeleton to neutrality, add ammonia solution with a concentration of 1mol / L for aging treatment for at least 24 hours, then wash the sample to neutrality, and control the temperature of the incubator at 40°C. After drying for 25 hours, a three-dimensional silica porous framework was obtained.

[0064] (4) Place the silica porous framework in an environment with a tem...

Embodiment 2

[0068] The preparation method of the graphene airgel provided in Example 2 is basically the same as the preparation method of the graphene airgel provided in Example 1, the difference being that the molecular weight of the polyethylene oxide (PEO) provided in Example 2 is 100,000.

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Abstract

The application provides a preparation method of graphene airgel, Fe 3 o 4 A graphene airgel and a preparation method thereof belong to the technical field of graphene airgel. The preparation method of the graphene airgel comprises: placing the annealed silicon dioxide porous framework at a temperature of 1100-1300° C. and growing graphene by a chemical vapor deposition method to obtain a pretreatment gel. The graphene airgel is obtained by removing the silica porous framework in the pretreated gel. Fe 3 o 4 A method for preparing the graphene airgel, comprising: mixing and reacting the graphene airgel and a dopamine solution under weak alkaline conditions to obtain the dopamine / graphene airgel. Fe was then obtained by alcohol thermal reaction and calcination 3 o 4 / Graphene airgel. The graphene airgel obtained by the above method has a special structure, fewer defects, and high electrical conductivity, so the obtained Fe 3 o 4 / Graphene airgel has better electromagnetic shielding performance.

Description

technical field [0001] The application relates to the technical field of graphene airgel, in particular, to a preparation method of graphene airgel, Fe 3 o 4 / Graphene airgel and preparation method thereof. Background technique [0002] At present, the preparation method of graphene airgel usually uses a metal three-dimensional framework (copper foam or nickel foam) as a catalyst, grows graphene in situ on the surface of the metal three-dimensional framework by chemical vapor deposition, and then removes the metal framework, and finally After drying, graphene airgel is obtained. However, due to the large pore size of the metal framework itself, and the relatively harsh preparation conditions of the framework itself, the graphene airgel obtained by this method has a large pore size and high preparation costs. Another method is to prepare graphene airgel by chemical reduction of graphene oxide dispersion. The graphene airgel prepared by this method has more defects and po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/186C01B32/194
CPCC01B32/186C01B32/194
Inventor 梅园赖垂林刘兆平
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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