Method of producing graphene

A production method and graphene technology, applied in the production field of graphene materials, can solve the problems of complicated process, complicated film transfer process, controlled, etc., and achieve the effects of excellent dispersibility and stability, low price and convenient application.

Inactive Publication Date: 2010-03-17
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of strong oxidants such as oleum, nitric acid, and potassium permanganate in the oxidation stage, and the use of hydrazine hydrate, dimethylhydrazine, metal sodium and potassium, hydroquinone, sodium borohydride, etc. Explosive strength reducing agent, this method will encounter serious problems such as waste water treatment, fire and explosion protection in the process of mass production, and the complex process and raw material prices will also make the production

Method used

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  • Method of producing graphene

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Embodiment 1

[0017] Take 100 mg of expandable graphite powder (200 mesh), add 30 mL of dimethylformamide and 20 g of grinding balls, take out the mixed solution after ball milling for 3 hours, perform ultrasonic treatment in an ultrasonic cleaner for 3 hours, and then centrifuge at 9000 rpm / min for 1 hour , the obtained upper layer solution is the graphene colloidal solution, and there is no stratification phenomenon after standing at room temperature at 30-38° C. for 2 hours, indicating that the colloidal solution has excellent dispersion stability.

Embodiment 2

[0019] Take 100 mg of expandable graphite powder (200 mesh), add 30 mL of dimethylformamide and 20 g of grinding balls, take out the mixed solution after ball milling for 3 hours, perform ultrasonic treatment in an ultrasonic cleaner for 3 hours, and then centrifuge at 9000 rpm / min for 1 hour , to obtain the upper colloidal solution. Use a rotary evaporator to dry to obtain a dark black powder, and carry out XRD analysis on the powder, as shown in figure 1 Shown in curve 1.

[0020] Example 2

[0021] Take 100 mg of graphite powder (200 mesh, purity 98.5%), add 30 mL of dimethylformamide and 20 g of grinding balls, take out the mixed solution after ball milling for 3 hours, perform ultrasonic treatment in an ultrasonic cleaner for 3 hours, and then centrifuge at 9000 rpm / min After 1 hour, a colloidal solution in the upper layer was obtained. Use a rotary evaporator to dry to obtain a dark black powder, and carry out XRD analysis on the powder, as shown in figure 1 Shown in...

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Abstract

The invention relates to a method of producing grapheme, which is characterized by comprising the following steps: (1) mixing the raw material of graphite powder with organic solvent according to theconcentration of 1-100 mg/ml to form suspension, and adding grinding balls to the suspension; (2) grinding and dispensing the suspension by a ball-grinding machine for 0.5-6.0h, and taking out slurry;(3) carrying out ultrasonic processing to the slurry for 0.5-6.0h; (4) separating the slurry centrifugally at high speed to obtain the upper solution which is the mixed colloid of monolayer graphemeand multilayer grapheme; and (5) concentrating, separating and replacing the solvent of the mixed colloid of the monolayer grapheme and the multilayer grapheme to obtain grapheme powder and stable grapheme colloid. The invention can consecutively produce the high-conductivity high-thermal conductivity grapheme which is dispersive and stable on a large scale with lost cost by using noncorrosive poisonous flammable and combustible raw materials without discharging waste water and waste gas.

Description

technical field [0001] The invention relates to a production method of a graphene material. Background technique [0002] Graphene is a single-atom-thick graphite crystal, which is an ideal two-dimensional material. Graphene crystal is a three-dimensional material superimposed by a large number of graphene. Since graphene is a zero-gap semiconductor, it not only has excellent mechanical properties, electrical and thermal conductivity (Graphene: Status and Prospects, Science, Vol.324 (June 2009) 1530-1534.), but also exhibits novel physical phenomena, such as Ballistic transmission characteristics, bipolar effect and room temperature quantum Hall effect, etc. (The Electronic Properties of Graphene, Reviews of Modern Physics, Vol.81(Jan-March 2009) 109-162.), in semiconductor devices, gas sensors, There are very broad application prospects in transparent conductive electrodes, supercapacitors, and high-performance polymer composites. [0003] The preparation methods of graph...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 卢金山
Owner NANCHANG HANGKONG UNIVERSITY
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