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Preparation method of graphene aerogel

A graphene airgel and graphene technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve potential safety hazards, unfavorable scale production of graphene airgel, unfavorable large size and scale Solve problems such as the preparation of graphene airgel, and achieve the effects of simple steps, mild process conditions, good adsorption characteristics and piezoresistive properties

Active Publication Date: 2017-03-22
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

For example, Zhang Xuetong proposed in "A Graphene Airgel and Its Preparation Method" (201010263656.4) to add a reducing agent to the graphene oxide dispersion to obtain graphene hydrogel, and then freeze-dry to prepare graphene airgel method, but the reduction process needs to introduce toxic reducing agents such as hydrazine hydrate, which has potential safety hazards and is not conducive to the large-scale production of graphene airgel
In the patent "A Preparation Method for Three-dimensional Self-assembled Graphene with High Adsorption" (201310110754.8), Gao Hui et al. proposed a hydrothermal method to self-assemble and simultaneously reduce graphene oxide sheets to obtain graphene hydrogel, and then freeze The method of drying graphene hydrogel to prepare graphene airgel, hydrothermal reduction avoids the use of toxic reducing agents, but hydrothermal needs to be carried out in a closed container, which is not conducive to large-scale and large-scale preparation of graphene airgel

Method used

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[0023] The invention provides a kind of preparation method of graphene airgel, comprises the following steps:

[0024] S1: adding graphene and amine-based polymers into the solvent and dispersing them to obtain a graphene dispersion;

[0025] S2: Freeze-drying the graphene dispersion to obtain graphene airgel.

[0026] Specifically, in the step S1, the graphene is selected from one or more of the oxidation-reduction method, the liquid phase exfoliation method, the arc method, the high temperature pyrolysis method and the chemical vapor deposition method. Graphene powder. The graphene includes single-layer or multi-layer graphene.

[0027] Oxidation-re-reduction method to prepare graphene is based on natural graphite as raw material, using oxidation reaction (introducing carboxyl and hydroxyl groups on carbon atoms on the edge of graphite layers, oxygen-containing groups such as epoxy and carbonyl groups between layers) to weaken the interaction between graphite layers. func...

Embodiment 1

[0041] 100 mg of graphene powder obtained by the oxidation-re-reduction method and 25 mg of chitosan were added to 100 mL of deionized water, and the graphene powder was completely dispersed in water by ultrasound to form a stable dispersion. Take the above-mentioned dispersion liquid and put it into a container, and freeze-dry it at -30°C and 1.5Pa for 24 hours to obtain a graphene airgel block. figure 2 , 3 , 4 are the SEM picture of the obtained graphene airgel, the piezoresistive characteristic curve and the statistical chart of the adsorption capacity of different solvents, respectively. It can be seen that the graphene airgel obtained is a porous bulk material, has good pressure-sensitive properties, and has a large adsorption capacity (about 30-60 times its own weight) to water and some organic solvents. It is expected to be used as pressure sensitive sensor and water pollution treatment material.

Embodiment 2

[0043] 500 mg of graphene powder obtained by liquid phase exfoliation and 80 mg of polyaniline were added into 100 mL of deionized water, and the graphene powder was completely dispersed in water by ultrasonic waves to form a stable dispersion. Take the above-mentioned dispersion liquid and put it into a container, and freeze-dry it at -30°C and 1.5Pa for 36 hours to obtain a graphene airgel block.

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Abstract

The invention provides a preparation method of a graphene aerogel. The preparation method comprises the following steps that S1, graphene and amido polymers are added into solvents and dispersed, so that graphene dispersion liquid is obtained; and S2, the graphene dispersion liquid is frozen and dried, so that the graphene aerogel is obtained. According to the preparation method of the graphene aerogel, the polymers containing amido serve as graphene dispersing agents and structural cross-linking agents, firstly strong interaction between the amido in the polymers and the graphene is utilized for dispersing graphene sheet layers in the solvents, and then the graphene dispersion liquid is directly frozen and dried, wherein the amido in the polymers is dried and cross-linked with the graphene sheet layers to form a structural framework, and accordingly the elastic graphene aerogel of a porous structure is prepared. According to the preparation method of the graphene aerogel, the graphene aerogel is directly prepared from graphene powder, process conditions are mild, the steps are simple, large-size graphene aerogel blocks can be produced in a large scale, and the obtained aerogel is good in adsorption characteristic and pressure resistance.

Description

technical field [0001] The invention belongs to the technical field of nano-carbon material preparation, and relates to a preparation method of graphene airgel. Background technique [0002] Graphene airgel is a porous bulk material formed by interconnecting graphene nanosheets in three-dimensional space. Graphene airgel has a low density (1-50mg / cm 3 ), high porosity (>50%), large specific surface area (100-1200m 2 / g), good mechanical properties, elasticity, good conductivity, stable chemical properties, etc., can be used as dielectric materials for clean energy storage (such as hydrogen, natural gas) and electrode materials for electric energy storage (such as supercapacitors). There are also important application prospects in the fields of phase catalysis, sewage treatment and sensors. [0003] In order to obtain a bulk material with a porous structure, graphene aerogels are generally prepared by freeze-drying graphene hydrogels. However, graphene cannot be unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194
Inventor 何朋周超丁古巧谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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