Method of preparing high-concentration graphene based on extraction technology

Abstract

The invention discloses a method of preparing high-concentration graphene based on an extraction technology and relates to the technical field of graphene preparation. The method comprises the following steps of: adding graphite powder into a stripping agent, performing stirring and stripping, dispersion and centrifugation through ultrasonic and / or mechanical shearing, taking a supernate to form alow-concentration graphene solution, and adding an extraction agent into the low-concentration graphene solution for vibration and separation to form high-concentration graphene dispersing liquid. Aconcentration of liquid phase stripping graphene is increased in a solvent conversion process by the solvent extraction technology; the aggregation of graphene sheets in a concentration process is avoided; the prepared graphene is higher in purity and have few defects; a surfactant is added to a liquid phase stripping graphene solution to facilitate the dispersion of the graphene in the extractionagent, so that the extraction time can be effectively shortened; and the method is simple in technology and low in cost and is expected to achieve the industrial preparation of the liquid phase stripping graphene.

Description

Technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a method for preparing high-concentration graphene based on extraction technology. Background technique [0002] The development trend of modern electronic devices is to maintain the same high performance as traditional rigid electronic devices while having large deformation capabilities, and to achieve the goals of meeting humanized market needs, accurately responding to commercial applications, low cost investment, and short payback periods. In order to achieve this goal, it is necessary for the solution of material ink, fast and low-cost preparation process, targeted market investment, and high-performance electronic devices as the research direction. Therefore, the primary goal is to achieve solutionized material inks to match the selected manufacturing process and meet the goals of uniformity of film morphology and high-resolution patterns of flexible electronic devi...

AI Technical Summary

Problems solved by technology

However, the concentration of liquid-phase exfoliated graphene is low and easy to agglomerate, which seriously affects its subsequent use. At present, there are three main methods to increase the concentration of liquid-phase exfoliated graphene.

One is as Li et al. (Jiantong Li.Adv.Mater.2013) adopt the mode of vacuum distillation to carry out solvent exchange, finally the graphene concentration of liquid phase exfoliation is increased by 60 times, and finally the graphene ink of 1.2mg / mL is obtained, but This method requires a vacuum distillation device, which is difficult to operate; secondly, (D.J.Finn.J.Mater.Chem.C.2014) such as Finn (D.J.Finn.J.Mater.Chem.C.2014) adopts the method of high-speed centrifugation to improve the concentration, which requires expensive equipment and a single treatment capacity Less; three such as Secor et al. (E.B.Secor.J.Phys.Chem.Lett.2013) use drying solvent to obtain powder and then reconfigure and disperse the method. The baking process of this method will cause the graphene sheets to stack again and redisperse will destroy the lamellar structure and morphology

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