Method for efficiently preparing two-dimensional black phosphorus crystal by taking SnP3 as catalyst

Abstract

The invention discloses a method for efficiently preparing a two-dimensional black phosphorus crystal by taking SnP3 as a catalyst. The method comprises the following steps: firstly, weighing a red phosphorus raw material and elemental metal tin, carrying out high-energy ball milling in an inert atmosphere to obtain SnP3 powder, and taking out the SnP3 powder for later use; and under an inert atmosphere, weighing the red phosphorus raw material, SnP3 powder and a transport agent, and carrying out heating treatment in a vacuum tube sealing system to finally prepare the high-purity and high-quality two-dimensional black phosphorus crystal. Compared with the traditional method for preparing the two-dimensional black phosphorus crystal by taking metal simple substance Sn as a catalyst, the intermediate product SnP3 of the reaction system is used as a catalyst so that the nucleation barrier required in the red phosphorus-black phosphorus conversion process can be remarkably reduced, the nucleation and growth processes of the reaction are accelerated, the reaction temperature and reaction time in the synthesis process can be reduced, the energy consumption is reduced, the pressure intensity in the pipe can be reduced and the pipe explosion is prevented. The black phosphorus crystal synthesized by the method has the advantages of few impurities, high purity and good quality and is more beneficial to realization of industrial large-scale preparation of the black phosphorus crystal.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional materials, in particular to a tin phosphorus compound (SnP 3 ) is a method for efficiently preparing two-dimensional black phosphorus crystals as a catalyst. Background technique [0002] Since 2014, due to its excellent performance, black phosphorus has attracted widespread attention, and is even considered as a new two-dimensional atomic material comparable to graphene. The most special value of two-dimensional black phosphorus is reflected in three aspects that are different from other two-dimensional materials. (1) Optical properties. The bandgap of thin-layer black phosphorus can be adjusted by the thickness (0.3-1.5eV), and its bandgap is just between the zero bandgap connecting graphene and the wider bandgap (1.5-2.5eV) of transition metal sulfides. Gap-defective bridges. Studies have shown that thin-layer black phosphorus exhibits strong light transmission efficiency in the ran...

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Problems solved by technology

In addition, as in the patent CN109305661A, tin-iodine-phosphorus ternary compound is used as a catalyst. Although its catalytic efficiency is high, it needs to introduce extremely volatile iodine or iodide in the synthesis process, so the purity of the product and the controllability of the synthesis process Poor, far less stable than tin-phosphorus compounds

[0005] Current research status, tin phosphorus compounds (SnP 3 ) is only used in the field of batteries, and there are few reports on its catalytic growth of two-dimensional black phosphorus crystals.

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