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Preparation method of graphene

A technology of graphene and graphite powder, which is applied in the field of materials, can solve the problems of many layers of graphene, serious environmental pollution, and low yield, and achieve the effects of simple preparation method, low production cost, and low equipment requirements

Inactive Publication Date: 2013-07-31
湖南元素密码石墨烯高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods all have certain deficiencies, such as cumbersome preparation process, serious environmental pollution, low yield, many layers of graphene, etc., which seriously limit the development of graphene and its related industries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 200g of deionized water and 20g of N-vinyl-2-pyrrolidone (the mass ratio of N-vinyl-2-pyrrolidone and water is 1:10) into the reactor, and stir at room temperature for 0.5h, Mix the solution thoroughly. Add 20 g of sodium hydroxide (the mass ratio of sodium hydroxide and water is 1:10), and continue stirring for 0.5 h to obtain a mixed solution. Then add 2g of graphite powder, ultrasonic treatment (500W, 50Hz) for 1h to obtain a suspension containing graphite powder, centrifuge at 600rpm to remove impurities, and then centrifuge at a speed of 20000rpm to collect the centrifuged product.

[0030] (2) The above-mentioned product was frozen at -30°C for 8 hours, then placed in a closed reactor, puffed at 200°C, the puffed powder was collected, and treated with a high-speed jet crushing device for 1 hour.

[0031] (3) Add the above product into a mixed solution of ethanol and water (mass ratio 1:10), ultrasonically disperse (500W, 50Hz) for 0.5h, wash with water, a...

Embodiment 2

[0039] (1) Add 200g of deionized water and 20g of N-vinyl-2-pyrrolidone (the mass ratio of N-vinyl-2-pyrrolidone and water is 1:10) into the reactor, and stir at room temperature for 0.5h, Mix the solution thoroughly. Add 25 g of potassium hydroxide (the mass ratio of potassium hydroxide to water is 1:8), and continue stirring for 0.5 h to obtain a mixed solution. Then add 3g of graphite powder, ultrasonic treatment (1000W, 50Hz) for 1h to obtain a suspension containing graphite powder, centrifuge at 600rpm to remove impurities, and then centrifuge at a speed of 20000rpm to collect the centrifuged product.

[0040] (2) The above-mentioned product was frozen at -30°C for 8 hours, then placed in a closed reactor, puffed at 150°C, the puffed powder was collected, and treated with a high-speed jet mill for 1 hour.

[0041] (3) Add the above product into a mixed solution of ethanol and water (mass ratio 1:10), ultrasonically disperse (500W, 50Hz) for 1h, wash with water, and spray...

Embodiment 3

[0044](1) Add 200g of deionized water and 10g of N-methyl-2-pyrrolidone (the mass ratio of N-methyl-2-pyrrolidone and water is 1:20) into the reactor, and stir at room temperature for 0.5h, Mix the solution thoroughly. Add 20 g of potassium hydroxide (the mass ratio of potassium hydroxide to water is 1:10), and continue stirring for 0.5 h to obtain a mixed solution. Then add 2g of graphite powder, ultrasonic treatment (500W, 50Hz) for 0.5h to obtain a suspension containing graphite powder, centrifuge at 600rpm to remove impurities, then centrifuge at a speed of 20000rpm to collect the centrifuged product.

[0045] (2) Freeze the above product at -50°C for 10 hours, then place it in a closed reactor, puff it at 200°C, collect the puffed powder, and process it with a high-speed airflow mill for 2 hours.

[0046] (3) Add the above product into a mixed solution of ethanol and water (mass ratio 1:10), ultrasonically disperse (500W, 50Hz) for 0.5h, wash with water, and spray dry. ...

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Abstract

The invention provides a preparation method of graphene. A few-layer graphene is prepared by the steps of mixed solvent preparation, crude product preparation, product primary treatment, product fine treatment and product acquiring. The few-layer graphene has 1-8 layers, a specific surface area of 450-800m<2> / g, a conductivity of 20-60S.m<-1>, and a weight loss of 1-2wt%within 900DEG C. Compared with the prior art, the preparation method disclosed in the invention has the advantages of simplicity, high yield, low production cost, low equipment requirement, and green and environment-friendly preparation process, thus being worthy of promotion.

Description

technical field [0001] The invention relates to the field of materials, in particular to graphene and a preparation method thereof. Background technique [0002] In 2004, researchers such as Geim of the University of Manchester in the United Kingdom peeled off a small amount of graphite monoliths from graphite, and discovered a new two-dimensional atomic crystal-graphene composed of carbon atoms connected by sp2 hybridization (Novoselov K.S., Geim A.K., Morozov S.V., et al.Electric field effect in atomically thin carbon films[J].Science, 2004, 306(5696):666-669.), its basic structural unit is the most stable benzene six-membered ring in organic materials , is the thinnest two-dimensional material in the world, with a thickness of only 0.35nm; the strength is the highest among the tested materials (Lee C.G., Wei X.D., Kysar J.W., et al.Measurement of the elastic properties and intrinsic strength of monolayer graphene[ J].Science, 2008, 321(5887): 385-388.), up to 130GPa, mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/19
Inventor 谭彬
Owner 湖南元素密码石墨烯高科技有限公司
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