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Preparation method for modified graphene

A graphene and modification technology, applied in the preparation of modified graphene, graphene materials and preparation fields, can solve the problems of unsatisfactory effect, difficult control and operation, complicated preparation process, etc., and achieves low cost, easy operation and low cost. The effect of simple control and preparation method

Active Publication Date: 2016-09-07
芽米科技(广州)有限公司
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Problems solved by technology

Although there have been many researches and reports on non-covalent bond modified graphene, its preparation process is generally complicated, not easy to control and operate, and the effect is not ideal.

Method used

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  • Preparation method for modified graphene
  • Preparation method for modified graphene

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preparation example Construction

[0022] The preparation method of modified graphene of the present invention, preparation steps are as follows, please also refer to figure 1 ,

[0023] S10, dispersing graphene oxide in deionized water, stirring ultrasonically at room temperature for 0.5-16 hours, to obtain a graphene oxide / water dispersion with a concentration of 0.01-3.0 mg / mL;

[0024] S20, adding the modifier sodium fluorescein to the above graphene oxide / water dispersion, and stirring at 20-60 degrees Celsius for 0.1-10 hours;

[0025] S30, add alkali solution to the system obtained in S20, stir for 0.1-10 hours, and adjust the pH value of the system to 9-10; the alkali solution is a sodium hydroxide solution with a concentration of 0.1-2.0mol / L or a mass concentration of 25%- 28% ammonia solution.

[0026] S40, add a chemical reducing agent, such as hydrazine hydrate, vitamin C or glucose, to the system obtained in S30, react at 60-95 degrees Celsius for 10-100 hours, and cool to room temperature;

[...

Embodiment 1

[0034] First, disperse graphene oxide in deionized water, and stir ultrasonically at room temperature for 1 hour to obtain a graphene oxide / water dispersion with a concentration of 0.05 mg / mL; then add a modifier, namely sodium fluorescein, and stir at 25 degrees Celsius for 2 hour; then add an aqueous sodium hydroxide solution with a concentration of 1.0 mol / L, stir for 0.5 hours, and adjust the pH value to 9-10; then add the chemical reducing agent hydrazine hydrate, and react at 80 degrees Celsius for 48 hours. Finally, the above sample was suction-filtered, washed with a large amount of ethanol and deionized water until it was nearly neutral or neutral, and dried at 50 degrees Celsius to a constant weight in an atmospheric environment to obtain modified graphene.

[0035] According to the mass ratio, graphene oxide: sodium fluorescein: chemical reducing agent is 1:5:10.

Embodiment 2

[0037] First, disperse graphene oxide in deionized water, and stir ultrasonically at room temperature for 3 hours to obtain a graphene oxide / water dispersion with a concentration of 0.1 mg / mL; then add a modifier, namely sodium fluorescein, and stir at 30 degrees Celsius for 2 hours; then add an aqueous sodium hydroxide solution with a concentration of 2.0 mol / L, stir for 3 hours, and adjust the pH value to 9-10; then add a chemical reducing agent vitamin C, and react at 90 degrees Celsius for 32 hours. Finally, the above sample was suction-filtered, washed with a large amount of ethanol and deionized water until it was nearly neutral or neutral, and dried at 60 degrees Celsius to a constant weight in an atmospheric environment to obtain modified graphene.

[0038] According to the mass ratio, graphene oxide: sodium fluorescein: chemical reducing agent is 1:10:20.

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Abstract

The invention discloses a preparation method for modified graphene. The preparation method comprises the following steps: preparing a graphene oxide / aqueous dispersion with a concentration of 0.01 to 3.0 mg / mL; adding sodium fluorescein into the graphene oxide / aqueous dispersion, and carrying out stirring; then adding an alkali solution and adjusting a pH value of a system to be 9 to 10; adding a chemical reducing agent, carrying out a reaction at 60 to 95 DEG C for 10 to 100 hours, and carrying out cooling to a room temperature; and subjecting the system to vacuum filtering or centrifuging, then carrying out washing with ethanol and deionized water to nearly neutral or neutral, and carrying out drying at 40 to 80 DEG C until a weight is constant so as to obtain the modified graphene. The preparation method provided by the invention is favorable for increasing and improving dispersibility of graphene in water and an organic solvent; meanwhile, the preparation method is simple, has mile condition, and is easy to operate and control.

Description

technical field [0001] The invention relates to graphene materials and preparation, in particular to a method for preparing modified graphene, which belongs to the field of graphene materials. Background technique [0002] Graphene is a new type of two-dimensional nano-carbon material with excellent electrical, mechanical and thermal properties. Therefore, it has become a research hotspot and focus in the field of nanomaterials. However, the surface of graphene is in an inert state, and the interaction with other media is weak, and there is a strong van der Waals force between graphene sheets, resulting in poor hydrophilicity and lipophilicity, making its dispersion poor. It is easy to agglomerate, which reduces the efficient utilization of the interface, thus greatly limiting its further research and application scope in the fields of energy storage, composite materials, catalysis, and electronic devices. [0003] The dispersion of graphene can be improved and increased by...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 黄杰王华高聂宏光周超陈万元
Owner 芽米科技(广州)有限公司
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