Method for effectively preparing high-orientation and high-compactness two-dimensional material thin film

Abstract

The invention relates to the field of preparation and application of two-dimensional materials, in particular to a method for effectively preparing a high-orientation and high-compactness two-dimensional material thin film. The method comprises the following steps: taking a circular tube with a smooth inner surface as a casting die; pouring a solution which contains a two-dimensional material intothe die when the die rotates in the peripheral direction at high speed; uniformly coating the inner surface of the die with the solution by using centrifugal force; forming shear force which drives the two-dimensional material to be regularly arranged layer by layer in an oriented manner in the peripheral direction in the solution in a centrifugal rotating process; and meanwhile, driving the two-dimensional material to be accumulated at high compactness by the centrifugal force so as to obtain the two-dimensional material thin film with high orientation and high compactness. The method is suitable for preparing various two-dimensional materials such as graphene, and composite thin films and laminated heterostructure thin films of the two-dimensional materials; electric property, heat property, mechanical property and the like of the thin film are greatly improved; and the method is used in the field of high-performance electric conduction / heat-conduction thin films, heat management materials, high-strength thin films, electronic / optoelectronic devices, compact energy storage, gas / ion separating films, proton transmitting films and the like.

Description

Technical field: [0001] The invention relates to the field of preparation and application of two-dimensional materials, and specifically relates to a new method for efficiently preparing highly oriented and dense two-dimensional material films by using a centrifugal casting process. Background technique: [0002] Due to the unique two-dimensional structural characteristics, two-dimensional materials such as graphene have a variety of excellent physical and chemical properties different from their bulk materials, and are widely used in electronics, optoelectronics, flexible display, sensing, energy storage, catalysis, separation membrane, thermal management , functional coatings, composite materials and other fields have broad application prospects. However, 2D materials prepared by chemical exfoliation are often only a few microns in size, so their assembly into macroscopically controllable macroscopic bulk materials is a prerequisite for their application. It is well known...

AI Technical Summary

Problems solved by technology

The two-dimensional materials in the film obtained by vacuum filtration and layer-by-layer self-assembly process have better orientation, but these two methods have low efficiency and are not suitable for the preparation of large-area thicker films

Although the other two processes have high film forming efficiency, the driving force to drive the directional self-assembly of two-dimensional materials is small and uncontrollable, and the arrangement of the two-dimensional materials inside the film is relatively chaotic.

Especially when these methods are used to prepare two-dimensional materials and polymer composite films, the self-assembly orientation of two-dimensional materials is more difficult due to the high viscosity of the solution.

In addition, the density of the film obtained by the above method still needs to be further improved to improve the contact between two-dimensional materials, so as to transfer the intrinsic properties of micron-sized two-dimensional materials to macroscopic bulk materials to the greatest extent.

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