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

A technology of black phosphorus and liquid nitrogen, applied in the field of nanomaterials, can solve the problems of expensive equipment, destruction of black phosphorus, and harsh preparation conditions, and achieve the effect of low cost and avoiding oxidation

Active Publication Date: 2018-08-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 electroch...

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of method that liquid nitrogen strips black phosphorus and prepares nanometer black phosphorus, concrete steps are as follows:

[0022] (1) In an inert gas (nitrogen) atmosphere, add 500mg of black phosphorus blocks to 1000mL of liquid nitrogen, where the solid-to-liquid ratio mg:mL of black phosphorus to liquid nitrogen is 0.5:1; at a temperature of -196°C Next, use a constant temperature oscillator to carry out constant temperature oscillation treatment for 1 hour to realize liquid nitrogen intercalation of black phosphorus to obtain black phosphorus / liquid nitrogen dispersion liquid; volatilize liquid nitrogen in black phosphorus / liquid nitrogen dispersion liquid to strip black phosphorus to obtain black phosphorus exfoliated material A ; Wherein liquid nitrogen volatilization adopts the heating method;

[0023] (2) Return the black phosphorus stripping material A to step (1) to replace the black phosphorus for liquid nitrogen stripping, and perf...

Embodiment 2

[0027] Embodiment 2: a kind of method that liquid nitrogen strips black phosphorus and prepares nanometer black phosphorus, concrete steps are as follows:

[0028] (1) In an inert gas (argon) atmosphere, add 10mg of black phosphorus blocks into 1000mL of liquid nitrogen, where the solid-to-liquid ratio mg:mL of black phosphorus to liquid nitrogen is 0.1:1; at a temperature of -150°C Under certain conditions, use a constant temperature oscillator to carry out constant temperature oscillation treatment for 2 hours to realize liquid nitrogen intercalation black phosphorus to obtain black phosphorus / liquid nitrogen dispersion; volatilize the liquid nitrogen in the black phosphorus / liquid nitrogen dispersion to strip black phosphorus to obtain black phosphorus exfoliation A; The liquid nitrogen volatilization adopts the method of decompression;

[0029] (2) Return the black phosphorus stripping material A to step (1) to replace the black phosphorus for liquid nitrogen stripping, an...

Embodiment 3

[0031] Embodiment 3: a kind of method that liquid nitrogen strips black phosphorus and prepares nanometer black phosphorus, concrete steps are as follows:

[0032] (1) In an inert gas (mixed gas of nitrogen and argon) atmosphere, add 1000mg of black phosphorus blocks into 200mL of liquid nitrogen, where the solid-to-liquid ratio mg:mL of black phosphorus to liquid nitrogen is 5:1; at temperature Under the condition of -100°C, use a constant temperature oscillator to carry out constant temperature shaking treatment for 5 hours to realize liquid nitrogen intercalation black phosphorus to obtain black phosphorus / liquid nitrogen dispersion liquid; volatilize liquid nitrogen in black phosphorus / liquid nitrogen dispersion liquid to strip black phosphorus. Black phosphorus stripping thing A; Wherein liquid nitrogen volatilization adopts the mode of decompression;

[0033] (2) Return the black phosphorus stripping material A to step (1) to replace the black phosphorus for liquid nitro...

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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...

Claims

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Application Information

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IPC IPC(8): C01B25/00B82Y40/00
CPCB82Y40/00C01B25/003
Inventor 廉培超刘红红梅毅姚一鸣汤永威
Owner KUNMING UNIV OF SCI & TECH
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