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Microwave-assisted method for preparing graphene through reduction of sodium citrate

A sodium citrate, microwave-assisted technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., to achieve uniform heating, increase reaction rate, and uniform size distribution

Inactive Publication Date: 2013-03-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the traditional preparation methods, it is difficult to quickly obtain graphene with uniform size distribution and excellent electrical properties under the premise of environmental protection.

Method used

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  • Microwave-assisted method for preparing graphene through reduction of sodium citrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Disperse 0.05g of graphite oxide prepared by the improved Hummers method in 200ml of deionized water, ultrasonically disperse at a power of 210~300W for 40~80min, add 1g of sodium citrate, stir evenly, and place in a microwave oven with a rated output power of 1000W In the reactor, set the reaction temperature at 70-95°C, react at a stirring rate of 600rpm / min for 60s-150s, cool to room temperature, and then centrifuge at a centrifugation rate higher than 13000rpm / min for more than three times, and freeze the black solid in the lower layer Just dry.

Embodiment 2

[0027] Disperse 0.1g of graphite oxide prepared by the improved Hummers method in 200ml of deionized water, ultrasonically disperse at a power of 210~300W for 40~80min, add 5g of sodium citrate, stir evenly, and place in a microwave oven with a rated output power of 1000W In the reactor, set the reaction temperature at 70-95°C, react at a stirring rate of 600rpm / min for 60s-150s, cool to room temperature, and then centrifuge at a centrifugation rate higher than 13000rpm / min for more than three times, and freeze the black solid in the lower layer Just dry.

Embodiment 3

[0029] Disperse 0.2g of graphite oxide prepared by the improved Hummers method in 200ml of deionized water, ultrasonically disperse at a power of 210~300W for 40~80min, add 10g of sodium citrate, stir evenly, and place in a microwave oven with a rated output power of 1000W In the reactor, set the reaction temperature at 70-95°C, react at a stirring rate of 600rpm / min for 60s-150s, cool to room temperature, and then centrifuge at a centrifugation rate higher than 13000rpm / min for more than three times, and freeze the black solid in the lower layer Just dry.

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Abstract

The invention relates to a microwave-assisted method for preparing graphene through reduction of sodium citrate. The microwave-assisted method comprises the following steps in sequence: dispersing 0.05 to 0.3g of graphite oxide prepared by an improved Hummers method into 200ml of deionized water; ultrasonically dispersing for 40 to 80 minutes at the power of 210 to 300W; adding 1 to 30g of sodium citrate; uniformly stirring; transferring the mixture into a microwave reactor with rated output power of 1000W; setting the reaction temperature to 70 to 95 DEG C to react for 60 to 300 seconds at the stirring speed of 600rpm / min; cooling to reach room temperature; centrifugally cleaning more than three times under centrifugal speed more than 13000rpm / min; and refreezing and drying the black solid at the lower layer, thus obtaining the graphene. The microwave-assisted method has the fast, environment-friendly and energy-saving characteristics, can be carried out to prepare the graphene which is uniform in size distribution and excellent in electrical properties, and can provide technical guarantee to the application of the graphene.

Description

technical field [0001] The invention belongs to the field of chemical engineering and technology, and in particular relates to a method for preparing graphene through microwave-assisted reduction of sodium citrate. Background technique [0002] Graphene is a two-dimensional honeycomb lattice material formed by the close combination of planar single-layer carbon atoms. This special structure makes it more important than graphite with high specific surface area, high mechanical strength and chemical stability. The carbon atoms in alkenes are sp 2 Hybridization, the electrons contributing to the remaining one p orbital form a large π bond, and the π electrons can move freely, making graphene have good electrical conductivity, a new type of quantum Hall effect, and unique superconducting properties. Its excellent electrical properties have attracted the attention of researchers at home and abroad in the application of conductive materials, which requires a simple, reliable, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184C01B32/192
Inventor 颜红侠刘超冯逸晨李松毛珂
Owner NORTHWESTERN POLYTECHNICAL UNIV
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