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Preparation method of reduced graphene oxide

A technology of graphene and graphite, which is applied in the field of graphene, can solve problems such as affecting the electrical properties of graphene, unfavorable health of operators, high toxicity of reducing agents, etc., and achieve good reduction performance, high environmental protection performance, and easy post-processing effects

Inactive Publication Date: 2012-06-13
BEIJING NORMAL UNIVERSITY +1
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  • Abstract
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Problems solved by technology

However, these reducing agents are highly toxic or flammable, which is not conducive to the health of operators, and the operation is also inconvenient, and will introduce other functional groups to affect the electrical properties of graphene.

Method used

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  • Preparation method of reduced graphene oxide

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preparation example Construction

[0026] The embodiment of the invention discloses a method for preparing graphene, comprising the following steps:

[0027] a), under the condition of ultrasonic vibration, graphite oxide is dispersed in water to obtain colloid;

[0028] b) Under acidic or alkaline conditions, using zinc as a reducing agent to reduce the graphite oxide to obtain graphene; the weight ratio of the graphite oxide to zinc is 1: (5.5-6.5).

[0029] The above method is to disperse graphite oxide in water by ultrasonic vibration to obtain colloid, and then use zinc as a reducing agent to reduce graphite oxide. Since zinc is an amphoteric metal, it can play a reducing role in acidic or alkaline conditions. The reduction reaction can be carried out under both acidic and basic conditions. The advantage of preparing graphene under acidic conditions is that the product has high purity, simple purification steps, and easy post-treatment; the advantage of preparing graphene under alkaline conditions is that...

Embodiment 1

[0050] Embodiment 1 prepares graphite oxide

[0051] 1. Rinse the graphite powder with distilled water, pour off the suspended matter in the upper layer, filter and dry;

[0052] 2. Take 5g of dried graphite and 230mL of 98% concentrated sulfuric acid, mix them in an ice bath, stir for 15min, and make them fully mixed. Weigh 30g of KMnO 4 After adding the above mixed solution and continuing to stir for 2 hours, move it into a medium temperature water bath at 35°C and continue stirring for 30 minutes, slowly add 460ml of distilled water into the reaction system, then place it in an oil bath at 98°C for 15 minutes, then add 1400ml of warm water, and then add 100ml of 30 %H 2 o 2 , the product was centrifuged, washed with 2L 5% HCl solution, washed with water until pH ≈ 5, and dried to obtain graphite oxide.

[0053] Use ultrasonic vibration to disperse 120mg graphite oxide in 150ml water, such as figure 1 Shown is the ultraviolet-visible spectrum of the graphite oxide soluti...

Embodiment 2

[0056] 1. Use ultrasonic vibration to disperse 120mg of graphite oxide in 120ml of water to obtain a colloid;

[0057] 2. Add 655 mg of zinc powder and 30 ml of 2.0 mol / L hydrochloric acid to the colloid obtained in step 1, and react at room temperature for 6 hours to end the reaction. The resulting mixture is filtered, washed with water, and dried to obtain graphene.

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Abstract

The invention provides a preparation method of reduced graphene oxide, which includes dispersing graphite oxide into water under the condition of ultrasonic oscillation to obtain colloid; restoring the graphite oxide with zinc as the reducing agent to obtain reduced graphene oxide under acid or alkaline condition with the weight ratio of the graphite oxide to the zinc as 1: (5.5-6.5). The preparation method utilizes the zinc as the reducing agent, and the zinc has good reducing performance to the graphite oxide, is low in cost and non-toxic, cannot damage health of operators and is high in environment-protection performance. No other functional groups need to be introduced if the zinc serves as the reducing agent, so that good electric performance of the reduced graphene oxide can be favorably maintained. More importantly, the zinc is metalloid, so that the preparation method can be used for preparing the reduced graphene oxide under both the acid condition and the alkaline condition. Therefore, preparation conditions can be flexibly selected according to requirements by means of the preparation method.

Description

technical field [0001] The invention relates to the field of graphene, in particular to a preparation method of 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. . [0003] In addition to its special structure, graphene also has many unique properties, most notably thermal conductivity and mechanical strength. Graphene is a good conductor that can dissipate heat quickly, and electrons pass through graphene with almost no resistance, and the heat generated is very small. Graphene is very strong and hard, its hardness is higher than that of diamond, and its strength is better than that of steel. The ideal strength can reach 110-130GPa. At the same time, graphene is a very excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/192
Inventor 杨晓晶杨胜黄大真林浩陈彩凤陈婷婷
Owner BEIJING NORMAL UNIVERSITY
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