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Method of preparing graphene through chemical reduction method

A graphene, reduction technology, applied in graphene, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of high toxicity of reagents, harsh reaction conditions, difficult to remove oxidation products, etc. Simple, low reaction temperature, low toxicity effect

Inactive Publication Date: 2013-06-05
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practice, this method is not too mature, such as the reagents used are highly toxic, the oxidation products are difficult to remove, and the reaction conditions are harsh (Shin, et. al, Adv Funct Mater, 2009, 19, 1987; Song Peng et al. , CN 102219210 A; Wu Lizhu et al., CN 102126720 A)

Method used

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  • Method of preparing graphene through chemical reduction method
  • Method of preparing graphene through chemical reduction method
  • Method of preparing graphene through chemical reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of graphene oxide

[0023] Heat 16 mL of 98% concentrated sulfuric acid to 80 °C, add 3.5 g of potassium peroxodisulfate and 3.5 g of phosphorus pentoxide, and then slowly add 4 g of flake graphite, and the mixture reacts at 80 °C for 6 h, and the reaction ends Cool to room temperature, then add 600 mL of deionized water, filter and wash with deionized water to obtain expanded graphite.

[0024] Add expanded graphite to 160 mL of concentrated sulfuric acid, then add 20 g of potassium permanganate under mechanical stirring, react at 40 °C for 6 h after the addition, and then react for another 2 h at room temperature. After the reaction is completed, add 160 mL of deionized water; react at room temperature for 2 h after adding water, then add 500 mL of water and 10 mL ~20 mL of 30 wt% hydrogen peroxide solution until the solution turns bright yellow. The solution was allowed to stand, the supernatant was poured off, and the remaining suspension was centri...

Embodiment 2

[0030] (1) The preparation of graphene oxide is the same as in Example 1.

[0031] (2) Reduction of graphene oxide

[0032] Take 10 mL of the graphene oxide solution obtained in step (1), add it to a 50 mL round bottom flask, then add 100 mg sodium hydroxide, 150 mg thiourea dioxide, dilute to 25 mL with deionized water, stir at room temperature, the color of the solution Gradually from brown to black, after 1 h the reaction was completed, washed with deionized water three times, and dried at room temperature to obtain graphene.

Embodiment 3

[0034] (1) The preparation of graphene oxide is the same as in Example 1.

[0035] (2) Reduction of graphene oxide

[0036] Take 10 mL of the graphene oxide solution obtained in step (1), put it into a 50 mL round bottom flask, then add 600 mg of sodium carbonate, 160 mg of thiourea dioxide, dilute to 25 mL with deionized water, stir at room temperature, the color of the solution gradually From brownish yellow to black, the reaction was completed after 2 h, washed with deionized water three times, and dried at room temperature to obtain graphene.

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Abstract

The invention relates to a method of preparing graphene through a chemical reduction method, belongs to the field of preparation of nano carbon materials and aims to provide a chemical method of preparing the graphene, wherein the method is simple and efficient and free from pollution to environment. A raw material is oxidized graphene synthesized through a Hummers oxidation method. Under catalysis of alkali, reducing agent thiourea dioxide is added and is stirred for 0.5-4 hours, and then the graphene is obtained. After a reaction is completed, graphene products are obtained through suction filtration, washing and drying. The thiourea dioxide and the alkali used in the method of preparing the graphene through the chemical reduction method is low in cost and low in toxicity, organic solvent is not used, the reaction condition is moderate, simple and easy to operate, and the method of preparing the graphene through the chemical reduction method is prone to industrialized application.

Description

Technical field: [0001] The invention relates to a method for preparing graphene through a chemical reduction method, belonging to the field of nano-carbon material preparation. Background technique: [0002] As the newest member of the family of carbon materials—graphene is a 2 The two-dimensional carbon atom crystal with hybrid orbitals was discovered by Geim et al. of the University of Manchester in 2004 and can exist stably. This is currently the thinnest material in the world—a material with a single-atom thickness. Graphene not only has excellent electrical properties, light weight, good thermal conductivity, and large specific surface area, its Young's modulus and fracture strength are comparable to carbon nanotubes, but also has some unique properties, such as quantum Hall effect, quantum tunneling effect, etc. Due to these unique nanostructures and excellent properties, graphene can be applied to many advanced materials and devices, such as thin film materials, en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00C01B32/19
Inventor 邢瑞光张邦文布林朝克
Owner INNER MONGOLIA UNIV OF SCI & TECH
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