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Preparation method of micro/nano graphene sheet

A graphene sheet, micro-nano technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high cost, large amount of chemical waste liquid, large environmental pollution, etc., and achieve easy operation , The effect of simple process

Active Publication Date: 2015-08-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the former can obtain high-quality and complete graphene, the cost is high and it is limited to demanding semiconductor industry applications
The latter can be produced in large quantities due to its relatively simple process and low cost, but because a large amount of chemical raw materials are required for graphite oxidation and graphene reduction, a large amount of chemical waste liquid will be generated, which will cause great environmental pollution.

Method used

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  • Preparation method of micro/nano graphene sheet
  • Preparation method of micro/nano graphene sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The anode electrode plate adopts a graphite plate with a thickness of 80mm, a length of 700mm, and a width of 700mm. Titanium plates; the spacing between adjacent anode graphite plates and cathode inert metal plates is 3 mm. The electrolyte is ultrapure water with a resistivity above 18MΩ. The power supply is a rectified DC power supply.

[0019] After turning on the power, the voltage is controlled at 4V, and the current density is controlled at 0-200mA / cm 2 , after 96 hours, a sol of micro-nano carbon particles was obtained. After evaporating water at 80°C, the solid matter was heated in a nitrogen atmosphere at 400°C for 120min to obtain graphene sheets with a diameter of about 10-100nm and a thickness of 5-10nm.

Embodiment 2

[0021] The anode electrode plate adopts a graphite plate with a thickness of 80mm, a length of 700mm, and a width of 700mm. Titanium plates; the spacing between adjacent anode graphite plates and cathode inert metal plates is 3 mm. The electrolyte is 0.1mol / L mellitic acid solution. The power supply is a rectified DC power supply.

[0022] After turning on the power, the voltage is controlled at 4V, and the current density is controlled at 100-200mA / cm 2 , after 48 hours, a sol of micro-nano carbon particles was obtained. After evaporating the water at 80°C, the solid matter was heated at 400°C for 120min in a nitrogen atmosphere to obtain graphene sheets with a diameter of about 50-1000nm and a thickness of 5-10nm.

Embodiment 3

[0024] The anode electrode plate is a graphite plate with a thickness of 80mm, a length of 700mm, and a width of 700mm, the ash content is ≤50ppm, and the bulk density is ≥1.5g / cm 3 ,, particle size <500um; the cathode electrode plate is a titanium plate with a thickness of 10mm, a length of 700mm, and a width of 700mm; the distance between adjacent anode graphite plates and cathode inert metal plates is 3mm. The electrolyte is ultrapure water with a resistivity above 18MΩ. The power supply is a rectified DC power supply.

[0025] After turning on the power, the voltage is controlled at 50V, and the current density is controlled at 0-300mA / cm 2 , after 48 hours, a sol of micro-nano carbon particles was obtained. After evaporating water at 80°C, the solid matter was heated at 600°C in a nitrogen atmosphere for 30 minutes to obtain graphene sheets with a diameter of about 50-500nm and a thickness of 5-10nm.

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Abstract

The invention provides a preparation method of a micro / nano graphene sheet, which comprises the following steps: by using a graphite plate as a positive pole, an inert metal plate or graphite plate as a negative pole and ultrapure water or a benzene hexacarbonic acid solution as a electrolyte, carrying out electrolysis on graphite to obtain a micro / nano carbon material with the diameter of 10-500nm; and drying by distillation, and carrying out heat treatment at 400-600 DEG C in an argon or nitrogen atmosphere for 30-120 minutes to obtain the micro / nano graphene sheet with the thickness of 5-10nm. The method is simple in technique and convenient for operation, and is green and environment-friendly. The prepared graphene sheet has small diameter size.

Description

technical field [0001] The invention relates to a method for preparing a micro-nano graphene sheet, in particular to a method for preparing a graphene sheet that can be used in areas such as plastic reinforcement, sensing, catalysis, battery anode materials, and stealth, and belongs to the field of nanomaterial preparation. Background technique [0002] Graphene materials have excellent electrical conductivity, thermal conductivity, and ultra-high strength, and are expected to be widely used in plastic material reinforcement, sensing, optoelectronics, battery electrodes, catalysis, and stealth. At present, there are two main types of large-scale preparation of graphene materials: one is to grow high-quality large-scale graphene films on copper or nickel substrates by chemical vapor deposition; the other is to prepare graphene powders by oxidation-reduction methods. Although the former can obtain high-quality and complete graphene, its cost is high and it is limited to demand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00B82Y40/00B82Y30/00
CPCC25B1/00
Inventor 曾宇乔李晨骏朱建峰陈佳熠陈友明郭俊楠张旭海邵起跃谈荣生蒋建清
Owner SOUTHEAST UNIV
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