阅读说明：本技术 一种黑磷纳米带的制备方法 (Preparation method of black phosphorus nanobelt ) 是由 梅毅 卢秋菊 廉培超 侯冉冉 张倩 于 2019-08-29 设计创作，主要内容包括：本发明公开一种黑磷纳米带的制备方法,在惰性气氛下,将过筛后的黑磷粉末负载到集流体上,作为可充电电池负极材料组装电池,进行恒流放电,恒流放电的电流密度为150~500mA/g,放电至比容量为100~500mAh/g时停止放电；放电结束后,在惰性气氛下,取出负极材料,用有机溶剂和水进行洗涤,然后离心,收集上清液,得到黑磷纳米带分散液；本发明方法具有可控性强、操作简单、成本低、耗时短的特点,本方法制备的黑磷纳米带在储能、自旋电子器件等领域具有很好的应用前景。(The invention discloses a preparation method of a black phosphorus nanobelt, which comprises the steps of loading sieved black phosphorus powder on a current collector in an inert atmosphere, using the current collector as a rechargeable battery cathode material to assemble a battery, carrying out constant current discharge, wherein the current density of the constant current discharge is 150 ~ 500mA/g, stopping the discharge when the discharge reaches the specific capacity of 100 ~ 500mAh/g, taking out the cathode material in the inert atmosphere after the discharge is finished, washing the cathode material with an organic solvent and water, centrifuging, and collecting supernatant to obtain a black phosphorus nanobelt dispersion liquid.)

1. A preparation method of a black phosphorus nanobelt is characterized by comprising the following specific steps:

(1) under inert atmosphere, loading the black phosphorus powder which is sieved by a 200-mesh sieve on a current collector, using the current collector as a rechargeable battery cathode material to assemble a battery, performing constant current discharge, wherein the current density of the constant current discharge is 150 ~ 500mA/g, and stopping the discharge until the specific capacity is 100 ~ 500 mAh/g;

(2) and (2) after the discharge in the step (1) is finished, taking out the negative electrode material in an inert atmosphere, washing the negative electrode material by using an organic solvent and water, centrifuging the negative electrode material, and collecting supernatant to obtain the black phosphorus nanobelt dispersion liquid.

2. The method for preparing black phosphorus nanobelts according to claim 1, wherein the current collector of the step (1) is foamed nickel, copper foil or aluminum foil.

3. The method for preparing the black phosphorus nanobelt according to claim 1, wherein the loading manner of the step (1) comprises ultrasound, coating or spraying.

4. The method for preparing black phosphorus nanobelts according to claim 1, wherein the rechargeable battery of the step (1) is a sodium ion battery, a lithium ion battery or a potassium ion battery.

5. The method for preparing black phosphorus nanobelts according to claim 1, wherein the organic solvent in the step (2) is acetone or ethanol, and the water is deionized water or ultrapure water.

6. The method for preparing black phosphorus nanobelts according to claim 1, wherein the washing manner in the step (2) is ultrasonic, shaking, stirring or shaking.

7. The method for preparing black phosphorus nanobelts according to claim 1, wherein the centrifugation speed in step (2) is 2000 ~ 8000r/min for 5 ~ 30 min.

8. The method for preparing black phosphorus nanobelts according to claim 1, wherein the inert gas in step (1) and step (2) is one or more of nitrogen, argon and helium mixed in any proportion.

Technical Field

The invention relates to a preparation method of a black phosphorus nanobelt, belonging to the technical field of nano materials.

Background

The nano black phosphorus has high carrier mobility, in-plane anisotropy, high on-off ratio and other properties, so that the nano black phosphorus has good application in many fields, such as field effect transistors, energy storage, gas sensors, biological medicines and the like. The application field and performance of the nano black phosphorus are determined to a great extent by the structure and the appearance of the nano black phosphorus. At present, the reported nano black phosphorus mainly comprises two-dimensional black phosphorus alkene and zero-dimensional black phosphorus quantum dots. The nanobelt combines the flexibility and unidirectional characteristics of the one-dimensional nanomaterial, the high specific surface area of the two-dimensional nanomaterial, and the electron confinement and edge effects of the two. Therefore, the structure of the nano-belt can specially control the structure of the electronic energy belt, and a new phenomenon and a unique structure appear. The anisotropic structure of the black phosphorus nanobelt stimulates a large amount of theoretical calculation of the black phosphorus nanobelt, and the excellent performance of the black phosphorus nanobelt is predicted. Recently, the black phosphorus nanobelt is reported to be prepared by a low-temperature ammoniation method, but the preparation process has the defects of high energy consumption, long time consumption, complex operation and the like. Therefore, it is necessary to develop a simple and easy-to-operate method for preparing black phosphorus nanobelt.

Disclosure of Invention

Aiming at the problems of the existing preparation method of the black phosphorus nanobelt, the invention aims to provide the preparation method of the black phosphorus nanobelt, which is simple to operate and strong in controllability.

The object of the present invention can be achieved by the following steps:

a preparation method of a black phosphorus nanobelt comprises the following specific steps:

(1) under inert atmosphere, loading the black phosphorus powder which is sieved by a 200-mesh sieve on a current collector, then using the current collector as a rechargeable battery cathode material to assemble a battery, performing constant current discharge, wherein the current density of the constant current discharge is 150 ~ 500mA/g, and stopping the discharge until the specific capacity is 100 ~ 500 mAh/g;

(2) and (2) after the discharge in the step (1) is finished, taking out the cathode material in an inert atmosphere, sequentially washing with an organic solvent and water, centrifuging, collecting supernatant to obtain black phosphorus nanobelt dispersion, and preventing black phosphorus from being oxidized in the whole process in the inert atmosphere.

Preferably, the current collector in the step (1) is foamed nickel, copper foil or aluminum foil.

Preferably, the loading mode in step (1) includes ultrasonic, coating or spraying, and when the loading mode is coating, the black phosphorus powder is mixed with the conductive agent and the binder and then coated.

Preferably, the rechargeable battery in the step (1) is a sodium ion battery, a lithium ion battery or a potassium ion battery.

Preferably, the organic solvent in the step (2) is a volatile solvent such as acetone, ethanol and the like, and the water is deionized water or ultrapure water.

Preferably, the washing mode in step (2) may be ultrasonic, shaking, stirring, shaking, etc.

Preferably, the centrifugal speed in the step (2) is 2000 ~ 8000r/min, and the time is 5 ~ 30 min.

Preferably, the inert gas in the step (1) and the inert gas in the step (2) are one or more of nitrogen, argon and helium mixed gas in any proportion.

The invention has the beneficial effects that:

(1) compared with the prior art for preparing the black phosphorus nanobelt, the preparation method provided by the invention is simple and rapid, has low requirements on equipment and is low in cost.

(2) The organic solvent can be directly volatilized, and complex secondary treatment is not involved.

Drawings

FIG. 1 is a photograph of a black phosphorus nanobelt dispersion prepared in example 1 of the present invention;

FIG. 2 is a low power Transmission Electron Micrograph (TEM) of the black phosphorus nanobelt prepared in example 1 of the present invention;

fig. 3 is a raman spectrum of black phosphorus and black phosphorus nanobelts prepared in example 1 of the present invention.

Detailed Description

The method of the present invention will be described in detail with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following examples.