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Preparation method of high-dispersivity graphene

A high-dispersion, graphene technology, applied in the field of graphene preparation, can solve the unavoidable problems of chemical reagents, etc., and achieve the effects of good stability, simple process and low cost

Inactive Publication Date: 2011-01-12
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some new methods developed recently use substances such as vitamin C and organic sugars, the use of chemical reagents and the formation of some by-products cannot be avoided in the whole process.

Method used

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  • Preparation method of high-dispersivity graphene

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Experimental program
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Effect test

Embodiment 1

[0016] A kind of preparation method of highly dispersed graphene,

[0017] 1), the preparation of graphite oxide: take 1.5g of flake graphite powder, 1.5g of sodium nitrate, 70ml of concentrated sulfuric acid with a mass concentration of more than 70%, add them to the there-necked bottle successively, stir evenly under ice bath conditions, slowly add 9g of high manganese Then warm up to room temperature for 2 hours, then add 100ml of distilled water, then heat up to 90°C for 1 hour; then add 300ml of distilled water and 10ml of 30% H to the reaction system 2 o 2 ; Then centrifuge the above solution several times, wash it several times with dilute hydrochloric acid, distilled water and absolute ethanol successively, the pH value is close to neutral, and dry the product at 80°C to obtain graphite oxide;

[0018] 2), the preparation of highly dispersible graphene: get the graphite oxide of 10mg to disperse in the distilled water of 50ml, ultrasonic stripping obtains the aqueous ...

Embodiment 2

[0021] .1), the preparation of graphite oxide is identical with embodiment 1. .

[0022] 2), the preparation of highly dispersible graphene: get the graphite oxide of 10mg to disperse in the distilled water of 50ml, ultrasonic stripping obtains the aqueous solution of graphene oxide, adds the polyvinyl alcohol (PVA, molecular weight 30000) of 15mg, then in ultraviolet lamp ( 254nm, 125W) under light irradiation for 48 hours. A black stable graphene dispersion is obtained. Then the above dispersion liquid was filtered, washed several times with distilled water, and dried at 50° C. to obtain highly dispersed graphene.

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Abstract

The invention discloses a green preparation method of high-dispersivity graphene, which comprises the following steps: preparing graphite oxide, performing ultrasonic-stripping to obtain graphene oxide, adding water-soluble high polymer as a dispersant, and reducing under the irradiation of ultraviolet light to obtain high polymer surface-modified high-dispersivity graphene. The method has the advantages of simple technical process and low cost, and does not need any reducing chemical reagent; the prepared graphene has high dispersivity and stability; and the obtained high polymer surface-modified graphene is beneficial to further application.

Description

technical field [0001] The invention relates to a preparation method of graphene. Background technique [0002] In 2004, Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom first prepared graphene, and graphene caused a research boom all over the world as soon as it came out. Graphene has good electrical and mechanical properties and has potential applications in various fields. [0003] The existing graphene preparation methods mainly include mechanical exfoliation method, chemical vapor deposition method, orientation epitaxy method and chemical redox method. Due to the uncertainty of the mechanical exfoliation method, the chemical vapor deposition method and the epitaxial method cannot be prepared in large quantities, and the chemical redox method has become the key to the industrial application of graphene. The chemical redox method basically involves the reduction process of graphene oxide, which generally uses a strong reducing agent (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 张平丁燕怀卓琴任虎鸣姜勇杨忠美
Owner XIANGTAN UNIV
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