Method of preparing nano black phosphorus by black phosphorus stripping through liquid nitrogen

Abstract

The invention relates to a method of preparing nano black phosphorus by black phosphorus stripping through liquid nitrogen and belongs to the technical field of nanomaterials. The method comprises thesteps of adding black phosphorus into the liquid nitrogen in an inert gas atmosphere, performing constant temperature vibration treatment for 0.5-6h at -196 to -100 DEG C to achieve intercalation ofthe liquid nitrogen into the black phosphorus, obtaining black phosphorus / liquid nitrogen dispersing liquid, volatilizing and stripping the black phosphorus from the black phosphorus / liquid nitrogen dispersing liquid to form a black phosphorus stripping substance A, replacing the black phosphorus with the black phosphorus stripping substance A for liquid nitrogen stripping, and performing cycle operation for more than once to form the nano black phosphorus. The method has the characteristics of simplicity in operation, time saving, no expensive and complicated equipment, greenness and environmental protection. The nano black phosphorus prepared by the method can be used for the fields of energy storage, catalysis, sensors, biological medicines and the like.

Description

technical field [0001] The invention relates to a method for preparing nanometer black phosphorus by stripping black phosphorus with liquid nitrogen, and belongs to the technical field of nanomaterials. Background technique [0002] Black phosphorus is a new type of two-dimensional material, because of its unique crystal structure and energy band structure, it exhibits high carrier mobility, good optical and optoelectronic properties, and excellent mechanical properties. Energy storage, field effect transistors, solar cells, gas sensors, biomedicine, catalysis and other fields have shown attractive application prospects. However, in practical applications, bulk black phosphorus has disadvantages such as poor conductivity and small reactive area. In order to further promote the application of black phosphorus, it needs to be nanometerized, that is, to prepare nano black phosphorus. At present, the preparation methods of nano black phosphorus mainly include: mechanical exfol...

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Problems solved by technology

However, these methods have corresponding shortcomings, such as low yield and time-consuming mechanical stripping, long-term liquid phase ultrasonic or shear stripping destroys the structure of black phosphorus, microwave or electrochemical assisted stripping equipment is relatively expensive, and supercritical CO 2 Due to the use of ultra-high pressure equipment, the preparation conditions are harsh, and the equipment used for vapor deposition is more complicated, etc.

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