Method for rapidly preparing high-quality two-dimensional black phosphorus crystals through seed crystal induction

Abstract

The invention discloses a method for rapidly preparing high-quality two-dimensional black phosphorus crystals through seed crystal induction. The method comprises the following steps: a red phosphorusraw material, a catalyst and a transport agent are weighed and are placed at the bottom (a raw material end and a hot end) of a single-head sealed quartz tube in an inert atmosphere, the internal ofthe single-head sealed quartz tube is separated by using a porous gasket, a black phosphorus seed crystal is weighed and is placed at the top (a nucleating end and a cold end) of the single-head sealed quartz tube, and the above reaction raw materials are sealed in the quartz tube by using a vacuum tube sealing system; and then the quartz tube is heated through optimized programmed heating and cooling, and the high-purity and high-quality two-dimensional black phosphorus crystal is finally prepared after the reaction is finished. Compared with a traditional preparation method without using crystal seeds, the method of the invention has the advantages of significant reduction of the reaction temperature and the reaction time in the synthesis process, reduction of the energy consumption, effective reduction of the introduction amounts of the catalyst and the transport agent required by the reaction, and cost saving. The black phosphorus crystals synthesized by the method have the advantages of few impurities, high purity, good quality, and facilitation of industrial large-scale preparation of the black phosphorus crystals.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional materials, and in particular relates to a method for rapidly preparing high-quality two-dimensional black phosphorus crystals through seed crystal induction. Background technique [0002] Two-dimensional black phosphorus is a new two-dimensional semiconductor material that stands out in recent years and has received extensive attention. With its excellent optoelectronic properties, it shows excellent potential in various photonic and optoelectronic device applications. First, black phosphorus has a flexible and tunable direct bandgap, which provides an optoelectronic device with a wide-spectrum and high-efficiency photoelectric response spanning from the visible to the mid-infrared. Secondly, considering the two key performances of the mobility and the switching ratio of transistor devices, black phosphorus fills the gap between graphene and transition metal dichalcogenides, providing ide...

AI Technical Summary

Problems solved by technology

However, due to the high temperature required for the reaction, it is difficult to achieve large-scale mass production

[0005] In short, the current seed crystal method to prepare black phosphorus crystals basically has a series of problems such as harsh reaction conditions, high reaction temperature, and inability to produce large-scale large-scale preparations.

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