High-quality and large-size two-dimensional material and preparation method thereof

Abstract

The invention discloses a high-quality and large-size two-dimensional material and a preparation method thereof. The preparation method of the high-quality and large-size two-dimensional material comprises the following steps: S1, after pre-treating lamellar structure material powder, dispersing in chemical drug liquid, so as to obtain a dispersion solution; S2, putting the dispersion solution into emulsifying and dispersing equipment, and carrying out chemical and shearing peeling on the lamellar structure material powder under the action of the chemical drug liquid and emulsification and dispersion; S3, carrying out centrifugal separation and vacuum drying to obtain the high-quality and large-size two-dimensional material. The high-quality and large-size two-dimensional material and thepreparation method thereof, provided by the invention, have the advantages of simplicity and rapidness, high peeling efficiency and capability of realizing continuous scale production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a high-quality and large-size two-dimensional material and a preparation method thereof. Background technique [0002] Two-dimensional materials represented by graphene and graphene-like molybdenum sulfide (materials that maintain a nanoscale in one dimension and electrons can only move freely in the other two non-nanoscales) are due to their unique electronic structure and force, light , electrical, magnetic, thermal and other properties, and has great application potential in many fields such as energy storage / conversion, photoelectric detection, electronics, catalysis, and biology. The preparation technologies of two-dimensional materials can be summarized into two types: chemical vapor deposition, epitaxial growth, and hydrothermal synthesis technology based on bottom-up concepts, and micromechanical exfoliation and liquid phase exfoliation technologies based on top-dow...

AI Technical Summary

Problems solved by technology

[0006] In short, there are still some problems in the preparation of two-dimensional materials by the existing liquid phase exfoliation technology, such as the wide distribution of the thickness (up to 10 layers) and the plane size (tens of nanometers to several microns) of the two-dimensional materials prepared by liquid phase exfoliation; Low monolayer yield (≤10%, except for electrochemical stripping technology based on lithium ion intercalation); low total stripping rate (≤17%, Coleman JNetal. Advanced Materials, 2011, 23, 3944-3948.); Thin The size of nanosheets is often small; some reagents are toxic, flammable and explosive, etc.

These problems lead to the fact that the existing two-dimensional materials are far from meeting the basic requirements of industrial and commercial products (low cost, high quality, high yield, safe and green)

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