A method for preparing two-dimensional materials

Abstract

The embodiment of the invention discloses a method for preparing a two-dimensional material. The two-dimensional material is prepared by stripping through a cutting force generated by secondary flow. The method comprises the following steps of selecting a raw material and a dispersing liquid, and preparing a mixed solution in a mixer; selecting a reactor and a power system, and connecting the reactor, the power system and the mixer; and pushing the mixed solution to the reactor, controlling the flow rate and the circulation time in the reactor, and stripping the raw material to prepare the two-dimensional material by rapid flowing of the mixed solution in the reactor and the cutting force generated by the continuous secondary flow formed at a bent plate. The preparation method has the advantages of simplicity in operation process, low cost, high adjustability and high universality and practicability, and is suitably used for various dispersing liquids and raw material systems; and infinite amplification in longitudinal dimension can be achieved during the preparation process, thus, an amplification effect does not exist, industrial production is promoted, and the method can be used for preparation of the two-dimensional material at a large scale.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing two-dimensional materials. Background technique [0002] Since Professor Geim and Professor Novoselov of the University of Manchester in the United Kingdom obtained few-layer and single-layer graphene for the first time by micromechanical exfoliation in 2004, two-dimensional materials include transition metal chalcogenides, transition metal oxides, and other two-dimensional compounds (such as nitrogen Boron chloride, etc.) has aroused extensive research interest of scientists from all over the world. Their novel physical and chemical properties have potential application prospects in many fields such as field effect transistors, optoelectronic devices, topological insulators, and energy storage. [0003] At present, there are two main methods for the preparation of two-dimensional materials: (1) "top-down" micromechanical force exfoliation method, lithi...

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Problems solved by technology

Chemical vapor deposition method is expected to realize the controllable synthesis of large-area two-dimensional materials, but this method is difficult to scale production, which limits its application

The liquid phase ultrasonic method uses ultrasonic action to insert organic solvents (surface energy is similar to that of layered materials) or surfactant molecules into the interlayer to overcome the cohesive energy density between adjacent layers and achieve peeling, but the preparation During the process, the high-energy ultrasonic effect will cause the size of graphene nanosheets to become smaller, and defects will be introduced on the surface and ends, which limits the application of two-dimensional materials in molecular electronic devices, etc.

The shear-assisted liquid phase exfoliation method uses shear to overcome the van der Waals force between layers to obtain a single-layer or few-layer structure. The main method is mechanical stirring. Large-scale mechanical stirring equipment not only consumes a lot of energy, but also it is difficult to achieve high speed of large-scale mixers. At the same time, there is a dead angle in the reactor.

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