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Preparation method of graphene

A graphene and graphite technology, applied in the field of graphene, can solve the problems of low yield, limited commercial application, small specific surface area of ​​graphene, etc., and achieve the effects of high specific surface area, good reduction performance, and high environmental protection performance

Inactive Publication Date: 2015-04-08
郴州博太超细石墨股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the yield is very low, which limits its commercial application; (5) oxidation-reduction method
This method is the simplest and common method to obtain graphene in large quantities. The more commonly used reduction methods are chemical reduction (hydrazine hydrate, ethylenediamine, sodium borohydride, etc. as reducing agents) and rapid thermal reduction, but various methods of reduction Finally, there will be a process of agglomeration of graphene, resulting in a small specific surface area of ​​graphene, generally less than 900m 2 / g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) disperse graphite oxide in water under the condition of ultrasonic vibration to obtain a suspension of 2g / L graphene oxide;

[0018] 2) Add 8 g of aluminum and 40 g of hydrochloric acid solution with a concentration of 0.5 mol / L to 1 L of the suspension in sequence, and react for 6 hours to obtain a mixed solution;

[0019] 3) adding sodium citrate to the mixed solution, filtering, then washing with water, drying to obtain graphene;

[0020] The specific surface area obtained by the obtained graphene through the BET test is 1215m 2 / g.

Embodiment 2

[0022] 1) disperse graphite oxide in water under the condition of ultrasonic vibration to obtain a suspension of 4g / L graphene oxide;

[0023] 2) Add 10 g of aluminum and 60 g of hydrochloric acid solution with a concentration of 0.8 mol / L to 0.5 L of the suspension in sequence, and react for 6 hours to obtain a mixed solution;

[0024] 3) adding sodium citrate to the mixed solution, filtering, then washing with water, drying to obtain graphene;

[0025] The specific surface area obtained by the obtained graphene through the BET test is 1423m 2 / g.

Embodiment 3

[0027] 1) disperse graphite oxide in water under the condition of ultrasonic vibration to obtain a suspension of 8g / L graphene oxide;

[0028] 2) Add 10 g of aluminum and 70 g of sulfuric acid solution with a concentration of 0.8 mol / L to 0.25 L of the suspension in sequence, and react for 7 hours to obtain a mixed solution;

[0029] 3) adding sodium citrate to the mixed solution, filtering, then washing with water, drying to obtain graphene;

[0030] The specific surface area obtained by the obtained graphene through the BET test is 1578m 2 / g.

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Abstract

The invention provides a preparation method of graphene. The preparation method is characterized by comprising the following steps of (1) dispersing graphite oxide into water under the condition of ultrasonic oscillation to obtain a graphene oxide suspension solution; (2) sequentially adding aluminum and an acid solution with the concentration of 0.5-2mol / L into the suspension solution, and reacting to obtain a mixed solution; and (3) adding sodium citrate into the mixed solution, filtering, then, washing with water, and drying to obtain graphene, wherein the acid solution in the step (2) is a hydrochloric acid solution or a sulfuric acid solution. No toxic raw materials are used in the method, so that the environment friendliness is relatively high; in addition, the condition that other functional groups are introduced to influence the electrical properties of graphene can be avoided; and the specific surface area of prepared graphene is relatively high.

Description

technical field [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene. Background technique [0002] Graphene is a new type of carbon material in which a single layer of carbon atoms is tightly packed into a two-dimensional honeycomb structure. It is the basic unit of other dimensional carbon materials, such as zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite. . Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Such as: 1, high strength, Young's molar weight, (1,100GPa), breaking strength: (125GPa); 2, high thermal conductivity, (5,000W / mK); 3, high electrical conductivity, carrier transport rate, ( 200,000cm 2 / V*s); 4, high specific surface area, (theoretical calculation value: 2,630m 2 / g). In particular, its high conductivity, large sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 林前锋
Owner 郴州博太超细石墨股份有限公司