Preparation method of tungsten diselenide nanosheet

Abstract

The invention discloses a preparation method of a tungsten diselenide nanosheet, and belongs to the technical field of nanometer material preparation. The preparation method comprises the following steps of dissolving sodium borohydride into an organic solvent, and successively adding selenium powder and sodium tungstate to prepare a mixed solution; transferring the mixed solution to a reaction kettle, and performing reaction for 6 to 48 hours at 200 DEG C to 240 DEG C; after the temperature of the reaction kettle is naturally cooled to the room temperature, collecting black products through suction filtration; washing the product by deionized water and ethyl alcohol; freezing and drying the washed product to obtain the tungsten diselenide nanosheet. The invention provides the method for synthesizing the tungsten diselenide nanosheet in one step by a solvothermal method for the first time. The preparation method has the advantages that the raw materials are green and environment-friendly; the cost is low; the yield is high; the reaction condition is mild; the scale production can be realized. The high-crystallization tungsten diselenide nanosheet prepared by the method has the advantages that the size is great; the layer number is small; the distribution is uniform; the specific surface area is high; high application prospects are realized in the fields of catalysis, energy storage and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a tungsten diselenide (WSe 2 ) Preparation method of nanosheets. Background technique [0002] In recent years, people have mostly studied transition metal sulfides and achieved great results. Judging from the current public literature, the main reason is that sulfur sources are wide and most of them have low toxicity, while water-soluble selenides are toxic. Therefore for transition metal sulfide MS 2 (M=Mo, W, Nb, Ta, Zr, Hf, Re, Pt) There are also many reports on the preparation method and performance research, while involving transition metal selenide MSe 2 (M=Mo, W, Nb, Ta, Zr, Hf, Re, Pt) There are few related studies, especially its morphology control and application research. Therefore, many scholars have turned their attention to transition metal selenides. [0003] Tungsten diselenide (WSe 2 ), as the main transition metal selenide, is a kind of en...

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Problems solved by technology

This method adopts two-step method, and preparation steps are loaded down with trivial details, and in WO 2 The selenization process also needs to be carried out under the protection of high-purity argon, and the reaction temperature is high, ranging from 600°C to 900°C

[0007] Because with graphite, M O S 2 Unlike natural minerals, WSe 2 It can only be prepared by artificial synthesis. Because the soluble selenium salt used in the synthesis of tungsten diselenide is toxic, the green synthesis method is single, and it is limited to the solid-phase synthesis of W-Se. The existing processes generally require CVD tube furnace However, the equipment is expensive, the preparation temperature is high, and the requirements for the reaction atmosphere are high, which is not conducive to large-scale industrial production

Therefore, WSe 2 The application of the

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