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Preparation method of graphene powder material

A technology of graphene powder and bulk material, applied in the field of graphene, can solve the problems of low concentration of graphene dispersion, limited application of graphene, incomplete reduction, etc., and achieve the effects of short cycle, mild reaction conditions and simple process

Inactive Publication Date: 2014-02-12
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of graphene powder material, to solve the problem of limited application of graphene caused by low concentration of graphene dispersion liquid and incomplete reduction in the prior art

Method used

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  • Preparation method of graphene powder material

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Embodiment 1

[0037] The preparation method of the graphene powder material of the present embodiment comprises the following steps:

[0038] 1) Add 1g of graphite oxide into 50ml of tetramethylammonium hydroxide solution with a mass concentration of 10%, and disperse it by ultrasonic, with an ultrasonic power of 400W and an ultrasonic time of 60min, to obtain a graphene dispersion;

[0039] 2) Add 5ml of tetramethylammonium borohydride to the graphene dispersion obtained in step 1), stir for 3 hours at room temperature, filter through a 0.45 μm microporous membrane, and freeze-dry at -20°C. The drying time is 10 hours, and the graphene powder material is obtained.

Embodiment 2

[0041] The preparation method of the graphene powder material of the present embodiment comprises the following steps:

[0042] 1) Add 1g of graphite oxide into 50ml of tetraethylammonium hydroxide solution with a mass concentration of 20%, and disperse it by ultrasonic, with an ultrasonic power of 300W and an ultrasonic time of 60min, to obtain a graphene dispersion;

[0043] 2) Add 5ml of tetraethylammonium borohydride to the graphene dispersion obtained in step 1), stir for 3 hours at room temperature, filter through a 0.1 μm microporous membrane, and freeze-dry at -10°C. The drying time is 24 hours, and the graphene powder material is obtained.

Embodiment 3

[0045] The preparation method of the graphene powder material of the present embodiment comprises the following steps:

[0046] 1) Add 1g of graphite oxide into 50ml of tetrapropylammonium hydroxide solution with a mass concentration of 30%, and ultrasonically disperse it with an ultrasonic power of 200W and an ultrasonic time of 60min to obtain a graphene dispersion;

[0047] 2) Add 5ml of tetrapropylammonium borohydride to the graphene dispersion obtained in step 1), stir for 3 hours at room temperature, filter through a 0.22 μm microporous membrane, and freeze-dry at -5°C. The drying time is 48h, and the graphene powder material is obtained.

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Abstract

The invention discloses a preparation method of a graphene powder material. The preparation method comprises the following steps of (1) adding graphite oxide into an organic alkaline solution, and carrying out ultrasonic dispersion to obtain a graphene dispersing solution; (2) adding an organic borohydride into the graphene dispersing solution obtained in the step (1), carrying out solid-liquid separation after stirring, and drying to obtain the graphene powder material. The graphene powder material prepared by using the preparation method of the graphene powder material, disclosed by the invention, has favorable dispersibility and stability in polar solvents such as water, methanol, ethanol, dimethyl formamide and the like, the concentration of the dispersing solution can be up to 2-5mg / ml, and no sediments are generated after the graphene powder material is stored for 4-6 months; the graphene powder material contains few impurities and has potential application values in the fields such as materials, energy, biological sensing, electronics, electrochemistry, solar cells and the like; the preparation method disclosed by the invention has the advantages of mild reaction condition, simple process, short period, low graphene impurity content, high efficiency, economy, environment friendliness and the like, and is easy to realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of graphene, in particular to a method for preparing a graphene powder material. Background technique [0002] Graphene is a two-dimensional carbon material, each carbon atom is sp 2 The way of hybridization to form a covalent bond is connected with the other three carbon atoms, and then arranged into a honeycomb lattice. The basic structural unit of graphene is the most stable benzene six-membered ring in organic materials. Its theoretical thickness is only 0.35nm, which is the thinnest two-dimensional material found so far. Its special single atomic layer structure determines its rich The novel physical phenomenon makes graphene exhibit many excellent physical and chemical properties. The tensile strength of graphene can reach 50-200GPa, and the elastic modulus can reach 1TPa, which is more than 100 times that of steel. It is the material with the highest specific strength that can be prepared at present...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/184C01B32/192
Inventor 彭淑鸽刘军娜樊昕洁
Owner HENAN UNIV OF SCI & TECH
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