Novel method for preparing high quality graphene material

Abstract

The invention relate to a novel method for preparing a high quality graphene material, and aims to satisfy the massive needs of high quality and low cost graphene. According to the preparation method, physical parameters such as mixed solution surface tension, viscosity, and the like should be maintained in a certain range; in realtime measurement, the surface tension and viscosity can be adjusted at the same time, or various raw materials can be added at random. Shearing and stirring equipment such as shearing emulsifying machine is adopted to shear and stir the raw materials, and then an ultrasonic wave treatment is adopted to obtain graphene dispersion liquid. The obtained graphene has a very large transverse dimension and extremely high concentration, the thickness is within four layers; due to the adopted non-oxidation method, the conductivity of graphene is high; the method is simple, no complicated technology or procedure is used, and the method is suitable for massive industrial production.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a new method for preparing high-quality graphene materials. Background technique [0002] Graphene is a special two-dimensional material composed of carbon atoms. Because of its excellent comprehensive physical properties such as high electrical conductivity, high mechanical strength, large specific surface area, and high thermal conductivity, it is widely used in electronics, aerospace military, new energy, etc. This field has important application value. [0003] In order to achieve and meet the needs of large-scale industrial production and practical application of graphene, the production and preparation methods of graphene must meet at least three important factors: high quality, large batches, and low cost. Although there are many methods for graphene preparation at home and abroad However, from the perspective of practical requirements such as high quality an...

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Problems solved by technology

For example, although vapor phase deposition (CVD) and SiC thermal decomposition can meet the requirements of producing high-quality graphene, they have the defects of high cost and complicated process; Coleman et al. J.Am.Chem.Soc. 2009, 131 , 3611–3620) prepared graphene with better properties by ultrasonically treating graphite in a solution of sodium dodecylbenzenesulfonate and water, but the concentration of the obtained graphene dispersion was extremely low (0.002–0.05 g / L), it is difficult to mass-produce on a large scale, so it does not meet the requirements of mass production; oxidation method is currently the most commonly used method for preparing graphene, which is relatively easy to mass-produce and the process is relatively simple, but the physical properties of the obtained graphene However, the performance is greatly damaged by the action of substances such as strong oxidants. Although in recent years people have further proposed the redox method to reduce the graphene oxide, so that the performance of the obtained graphene products has been greatly improved, but the used in this method Substances such as strong oxidants and strong reducing agents have disadvantages and problems such as strong corrosion, high toxicity, and high environmental costs; in addition, there are many other new graphene preparation methods, but they usually involve complex preparation processes, difficulty in large-scale production, etc. There are a series of problems such as high production, high cost, and great environmental hazards. There are currently relatively few graphene preparation methods that can simultaneously meet the three important factors of high quality, large batches, and low cost.

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