SnSe square nanosheets and preparation method thereof

Abstract

The invention discloses SnSe square nanosheets and a preparation method thereof, belonging to the technical field of preparation of nanometer materials. The preparation method comprises the following steps: uniformly mixing tin powder and selenium powder, and pressing into a pressing block; arranging the pressing block in a graphite pot, putting the graphite pot into a copper pan anode in a reaction chamber of a direct current arc discharge device, wherein a tungsten rod cathode is opposite to the copper pan anode; introducing circulating cooling water into the cooling wall; carrying out a discharge reaction in the mixed gas of argon and nitrogen, wherein the discharge voltage is 18V, the current is 80-85A, and reacting for 1-2 minutes; and passivating in an argon atmosphere, and collecting the ash black powder to serve as the SnSe square nanosheets on the inner side of the top cover of the condensation wall. The sample purity is high, the crystallinity is high, and the shape and size are uniform; any substrate, template and catalyst are not needed in the preparation process, and the method is environment-friendly; and the method is short in preparation time, low in energy consumption, low in cost and high in repeatability. The prepared product has potential application values in aspects such as solar cell conversion, holographic record and recycled lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a simple method for preparing square nanosheets of stannous selenide. Background technique [0002] With the extensive and in-depth research on nanomaterials, it is found that nanomaterials have a large specific surface area, and the number of surface atoms, surface energy, and surface tension increase sharply with the decrease of particle size, showing small size effects, surface effects, and quantum size effects. And macroscopic quantum tunneling effect and other characteristics, resulting in nanomaterials are different from traditional materials in terms of magnetism, electricity, optics, and mechanical properties. Among them, nanosheet-like structure materials are called two-dimensional nanomaterials because their size in only one dimension is much smaller than other dimensions. This material has broad application prospects in microelectronic dev...

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Problems solved by technology

However, the above-mentioned preparation methods generally have the characteristics of long reaction time, low output, need to add reaction catalysts, surfactants, and rely on substrate growth, etc., which lead to high costs and secondary pollution to the environment during the preparation process.

In addition, due to the cumbersome reaction steps, precursors, intermediate products, solvent residues, etc. are difficult to remove in the product and adsorbed on the surface of the product, which brings great difficulties to the further study of the essential properties of SnSe.

[0004] There is no report on the preparation of SnSe nanosheets by arc method

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