Method for preparing high-quality large-size two-dimensional material

Abstract

The invention discloses a method for preparing a high-quality large-size two-dimensional material. The method includes: extruding and grinding the mixture of a layered material and grinding particles to strip the layered material so to obtain evenly-stripped solid powder, wherein the particle size of the grinding particles is 10-10000 meshes, and the solid powder mainly comprises large-size two-dimensional materials with the size being 0.1-20 micrometers; placing the stripped solid powder into a solvent, shaking up, settling, and taking supernate to obtain the dispersion liquid of the high-quality large-size two-dimensional material. The method has the advantages that the method is high in stripping efficiency, factors such as solubility limit need not to be considered during the grinding, the prepared two-dimensional material is large in size and good in crystal structure, and a solution with the concentration reaching up to 50mg / mL, which is the highest currently, can be prepared by selecting an appropriate solvent; the high-concentration ink is of great significance to the application of the two-dimensional material to printing devices and flexible electronics.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a method for preparing high-quality large-size two-dimensional materials based on solid-phase shearing and exfoliation of layered materials through liquid phase separation. Background technique [0002] Graphene is a hexagonal honeycomb single-layer structure composed of carbon atomic layers. Due to its unique structural features, it has unique physical and chemical properties, such as room temperature quantum effects, ultra-high carrier mobility, etc. At the same time, this two-dimensional material with a nanometer thickness also has excellent properties such as transparency, high conductivity, and flexibility. According to the difference in composition and structure, there are various types of two-dimensional materials. They inherently show various properties different from graphene, so they have different application prospects. When the intrinsic propertie...

AI Technical Summary

Problems solved by technology

However, the yield of two-dimensional materials prepared by liquid phase exfoliation is very low and requires the use of organic solvents

In addition, the preparation methods of two-dimensional materials are (1) prepared by oxidation intercalation, but it will bring functional groups to two-dimensional materials, thereby losing or deteriorating their intrinsic properties, such as graphene oxide; (2) by Intercalation of reducing alkali metals, etc., to achieve intercalation of organic molecules, such as the stripping of molybdenum disulfide; the two-dimensional materials prepared in this way will also have many defects, which are very different from the original two-dimensional materials.

At the same time, the two-dimensional materials obtained by this method are not suitable for large-scale preparation.

(3) It is prepared by ball milling, because the layered material is shredded and thinned by the impact between steel balls, so although the yield is high, the size is small and there are many structural defects

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