Method of producing graphene

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...

AI Technical Summary

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 cost face challenges (CN101462719)

The CVD method can produce single-layer or low-layer graphene materials with a large area (centimeter scale), which has great application potential in device manufacturing, but the size of the graphene film is still limited by the transition metal substrate (Cu, Ni, Ru, etc. ) size, and the film transfer process is complex, how to maintain the stability of product performance will be the key to mass production of devices (CN101285175, CN101423209)

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