Preparation method of ultrathin tungsten selenide nanometer slices

Abstract

The invention discloses a preparation method of ultrathin tungsten selenide nanometer slices, and particularly relates to an oil phase method for preparing tungsten selenide. The material has the property of catalyzing benzylamine to produce imine through coupling. The method provided by the invention belongs to the technical field of material preparation and application. A Schlenk line route is used; oleylamine, oleic acid, octadecene and N-dodecyl mercaptan are used as solvents; a selenium source and a tungsten source at a certain ratio are used as reactants for preparation at a certain reaction temperature to obtain the feather-shaped ultrathin nanometer slices with the thickness being smaller than 2nm; the nanometer slices have the effect of efficiently catalyzing the benzylamine to produce N-benzylamine through coupling; in cyclohexane and acetonitrile solvents, the yield of N-benzylamine through benzylamine coupling respectively reaches 95 percent and 96 percent. The catalyst hasthe advantages of great specific surface area and high catalysis efficiency; noble metal is not used; the cost is low. The preparation process is simple; the operation is easy; the use of an organictemplate and surfactant is not needed; the preparation method is suitable for industrial production; the prepared tungsten selenide phase is pure; the specific surface area is large; the repeated utilization performance is high.

Description

technical field [0001] The invention belongs to the technical field of material preparation and application, and specifically relates to the preparation of an ultra-thin tungsten selenide nanosheet by an oil phase method. The material has the property of catalyzing the coupling of benzylamine to generate imine. Background technique [0002] Recently, selenide semiconductor nanomaterials have become a current research hotspot due to their various physical and chemical properties, including thermoelectric properties, dielectric properties and their potential applications. Most of these materials have low energy band gap, high absorption coefficient, good light resistance, low toxicity, and high photoelectric conversion efficiency. As one of the important compounds of the selenide family, tungsten selenide material consists of a two-dimensional Se-W-Se layered structure, in which the W atomic plane is located in the middle of two hexagonal Se atomic planes. The tungsten seleni...

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Problems solved by technology

[0003] It can be seen from the above description and examples that there are many methods for making tungsten selenide nanosheets, but most of them require high reaction conditions and technical difficulties. There are few reports on the synthesis of tungsten selenide nanosheets in the solution phase.

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