Liquid phase synthesis method of ultra-thin molybdenum diselenide nanosheet

Abstract

The invention provides a liquid phase synthesis method of an ultra-thin molybdenum diselenide nanosheet, which comprises the following steps of: mixing a molybdenum source, a selenium source and organic amine, and removing impurities to obtain a mixed solution; reacting the mixed solution at 240-300 DEG C for 20-60min to obtain an ultra-thin molybdenum diselenide nanosheet; wherein the molybdenumsource is selected from one or more of ammonium molybdate, sodium molybdate, ammonium phosphomolybdate, molybdenum trioxide, oxymolybdenum acetylacetonate and molybdenum acetate; the selenium source is selected from one or more of selenium powder, selenium methionine and dibenzyl diselenium. According to the invention, a precursor source (a molybdenum source and a selenium source) of a specific kind and an organic amine solvent are selected to promote spreading to form an ultra-thin molybdenum diselenide nanosheet with a large area and an uniform and smooth appearance; the raw materials are common raw materials, the conditions are mild, and the method is simple; the method has short preparation period and high yield. The nanosheet has a single-layer or several-layer morphology. That the molybdenum diselenide is a coexistent phase of 1T phase and 2H phase, which can be seen from a photoelectron spectrogram and a high-angle annular dark field image and is beneficial to the improvement ofthe conductivity.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, in particular to a liquid-phase synthesis method of ultrathin molybdenum diselenide nanosheets. Background technique [0002] Molybdenum diselenide (MoSe 2 ) has a graphite-like crystal structure, and six-coordinated molybdenum atoms form a "sandwich" structure between two layers of selenium atoms. This structure is connected by van der Waals force in space, and different stacking methods form different structures. The quantum size effect and the exposure of catalytic active sites make it a good application prospect in photocatalysis, electrocatalysis, energy storage, etc. [0003] Most of the reports on the preparation of large-area single-layer and several-layer molybdenum diselenide are through mechanical exfoliation, liquid phase exfoliation or chemical vapor deposition, but there is no report on the wet synthesis of large-area single-layer and multi-layer. The synthes...

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Problems solved by technology

The synthesis conditions by stripping or vapor deposition are generally harsh, or the process is complicated, the preparation conditions are strict, or the equipment is expensive, which limits its practical application.

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