Metal ditelluride nanosheet and preparation method thereof

Abstract

The invention provides a preparation method of a ditelluride nanosheet, which comprises the following steps: S1) mixing a metal ditelluride crystal, an alkali metal salt and an aprotic solvent for reaction under a high pressure condition to obtain an intermediate inserted with alkali metal ions; and S2) stripping the intermediate inserted with the alkali metal ions in a protic solvent to obtain the ditelluride nanosheet. Compared with the prior art, alkali metal ions are inserted between metal ditelluride layers under the condition of high pressure, so that the crystallinity and integrity of the plane are ensured while the interlayer spacing is enlarged. Rapid expansion dissociation is carried out in protic solvent, solvent molecules are fully utilized to enter interlayer of intermediate, interlayer spacing is further enlarged, interlayer van der Waals force of metal ditelluride material is overcome, meanwhile, intralayer chemical bonds are effectively protected, and the large-size and high-quality ditelluride nanosheet is obtained. According to the method, solution reaction is utilized, the method is simple, the yield is high, the process is controllable, and macro quantization can be achieved.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a metal ditelluride nanosheet and a preparation method thereof. Background technique [0002] Since Novoselov, Geim and their collaborators at the University of Manchester successfully used Scotch tape to exfoliate graphene from layered graphite micromechanics in 2004, two-dimensional materials have officially entered people's field of vision, and after more than ten years of development, they have achieved great progress. Explosive progress and promising application prospects. Graphene with a single atomic layer thickness has a different electronic structure from graphite and brings many excellent electrical, optical and mechanical properties. Similarly, with the research on other materials with layered structure, more and more materials with atomic thickness have been developed, including hexagonal boron nitride with insulating properties, molybdenum di...

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Problems solved by technology

At present, the traditional top-down method in the solution phase exfoliation method, especially the ultrasonic exfoliation, due to the high power density, the energy when the center of the bubble bursts is large. In addition to breaking the interlayer van der Waals force of the layered material, it can also destroy the in-plane chemical bonds, so the obtained nanosheets have the problems of low yield and small size, which are not suitable for large-scale production of ultra-thin two-dimensional materials, especially two-dimensional structures with large size and high quality; chemical exfoliation can be used in transition metal sulfides and selenides obtained higher yields

However, for tellurides, the conventional chemical intercalation stripping method, due to the strong reactivity between metal ditelluride and intercalation molecules, is easy to destroy the crystallinity and stoichiometric ratio of the material. The corresponding two-dimensional structure

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