阅读说明：本技术 一种二硫化钼纳米片的制备方法 (Preparation method of molybdenum disulfide nanosheet ) 是由 许并社 欧阳辉灿 尚林 于 2021-11-02 设计创作，主要内容包括：本发明属于二维层状材料制备技术领域,具体涉及一种二硫化钼纳米片的制备方法,包括以下步骤：S1、将二硫化钼粉末置于分散剂中,制备均一分散液；S2、将S1制备的均一分散液进行超声处理；S3、将S2超声处理后的分散液进行梯度离心处理,取上清液即可获得二硫化钼纳米片分散液；本发明方法所用原料简单,制备方法简单,制备周期较短而且可得到较为均匀的二硫化钼纳米片。(The invention belongs to the technical field of preparation of two-dimensional layered materials, and particularly relates to a preparation method of a molybdenum disulfide nanosheet, which comprises the following steps: s1, putting the molybdenum disulfide powder into a dispersing agent to prepare uniform dispersion liquid; s2, carrying out ultrasonic treatment on the uniform dispersion liquid prepared in the S1; s3, carrying out gradient centrifugation on the dispersion liquid subjected to the ultrasonic treatment in the S2, and taking supernatant to obtain molybdenum disulfide nanosheet dispersion liquid; the method has the advantages of simple raw materials, simple preparation method, short preparation period and uniform molybdenum disulfide nanosheet.)

1. A preparation method of molybdenum disulfide nanosheets is characterized by comprising the following steps:

s1, putting the molybdenum disulfide powder into a dispersing agent to prepare uniform dispersion liquid;

s2, carrying out ultrasonic treatment on the uniform dispersion liquid prepared in the S1;

and S3, carrying out gradient centrifugation treatment on the dispersion liquid subjected to the ultrasonic treatment in the S2, and taking supernatant to obtain the molybdenum disulfide nanosheet dispersion liquid.

2. The method for producing molybdenum disulfide nanosheets as claimed in claim 1, wherein in S1, the dispersant is a mixed solvent of N, N-dimethylformamide and water, a mixed solvent of N-methylpyrrolidone and water, or a mixed solvent of isopropanol and water.

3. A method for producing molybdenum disulfide nanosheets according to claim 2, wherein in S1 the ratio of molybdenum disulfide: n, N-dimethylformamide or N-methylpyrrolidone or isopropanol: h₂The dosage ratio of O is 0.1 g-0.35 g: 60-80 mL: 20 mL.

4. The preparation method of molybdenum disulfide nanosheets according to claim 1, wherein in S1, the dispersing agent is prepared by magnetic stirring for 20-30 min, then the molybdenum disulfide powder is added into the dispersing agent, and the magnetic stirring is continued for 10-20 min to prepare a uniform dispersion liquid.

5. The preparation method of molybdenum disulfide nanosheets according to claim 1, wherein in S2, the power of ultrasonic treatment is 100-300W, and the ultrasonic time is 7-10 h.

6. The preparation method of molybdenum disulfide nanosheets according to claim 1, wherein in S3, the gradient centrifugation treatment is specifically performed for 20-30 min at a rotation speed of 2000-3000 r/min, and then is performed for 10-20 min at a rotation speed of 5000-6000 r/min.

Technical Field

The invention belongs to the technical field of preparation of two-dimensional layered materials, and particularly relates to a preparation method of a molybdenum disulfide nanosheet.

Background

In recent years, with the continuous research on two-dimensional layered materials, the two-dimensional layered materials have been developed as one of the research objects of great interest in the field of material science. By definition, two-dimensional layered materials are limited to single atomic layer nanomaterials, but at present, single or few layer nanomaterials are also classified as two-dimensional layered materials. The two-dimensional layered material has the advantages of low density, high mechanical strength, low friction coefficient, good thermal conductivity and the like, and is widely applied to the aspects of energy, environment, electronics, biology and the like. The two-dimensional layered material comprises graphene, black phosphorus, hexagonal boron nitride, a transition metal chalcogenide, a transition metal oxide and the like, the layered material similar to the graphene is generally called a graphene-like layered material, and the research on the optical, electrical, catalytic and other properties of different graphene-like two-dimensional materials shows that the graphene-like two-dimensional materials have excellent performances in the aspects of electronic devices, transistors, energy storage, catalysis and the like.

Molybdenum disulfide is one of the materials, most of the existing preparation processes of molybdenum disulfide nanosheets are complex and tedious, and a lot of preparation work needs to be done, so that a method which is simple in preparation process, short in preparation period and easy in obtaining of preparation raw materials is needed to be provided for preparing the molybdenum disulfide nanosheets.

Disclosure of Invention

In order to solve the technical problem, the invention provides a preparation method of a molybdenum disulfide nanosheet.

The invention is realized by the following technical scheme.

A preparation method of molybdenum disulfide nanosheets comprises the following steps:

s1, putting the molybdenum disulfide powder into a dispersing agent to prepare uniform dispersion liquid;

s2, carrying out ultrasonic treatment on the uniform dispersion liquid prepared in the S1;

and S3, carrying out gradient centrifugation treatment on the dispersion liquid subjected to the ultrasonic treatment in the S2, and taking supernatant to obtain the molybdenum disulfide nanosheet dispersion liquid.

Preferably, in S1, the dispersant is a mixed solvent of N, N-Dimethylformamide (DMF) and water, a mixed solvent of N-methylpyrrolidone (NMP) and water, or a mixed solvent of isopropanol and water.

Preferably, in S1, the ratio of molybdenum disulfide: n, N-dimethylformamide or N-methylpyrrolidone or isopropanol: h₂The dosage ratio of O is 0.1 g-0.35 g: 60-80 mL: 20 mL.

Preferably, the dispersing agent is prepared by magnetic stirring for 20-30 min, the molybdenum disulfide powder is added into the dispersing agent, and the magnetic stirring is continued for 10-20 min to prepare uniform dispersion liquid.

Preferably, the power of ultrasonic treatment is 100-300W, and the ultrasonic time is 7-10 h.

Preferably, the gradient centrifugation treatment is specifically performed for 20-30 min at a rotating speed of 2000-3000 r/min, and then is performed for 10-20 min at a rotating speed of 5000-6000 r/min.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention provides a method for preparing molybdenum disulfide nanosheets, which comprises the steps of taking molybdenum disulfide powder as a preparation source, placing the molybdenum disulfide powder in a dispersing agent, and carrying out ultrasonic treatment and centrifugal treatment to successfully obtain molybdenum disulfide nanosheets, wherein the prepared molybdenum disulfide nanosheets are small in size and thin in thickness, and the mechanism is that a mechanical stripping means is adopted, specifically, when ultrasonic waves with the power of 100-300W are transmitted in an elastic medium, particles in the elastic medium are oscillated, so that the molybdenum disulfide powder is violently collided, and the nanosheets are formed;

(2) the preparation method is simple, does not need complicated experimental steps, can be carried out in a common laboratory, has low equipment requirement, does not need various expensive equipment and instruments, and saves a large amount of time and scientific research cost.

Drawings

Fig. 1 is a schematic flow chart of a preparation method of molybdenum disulfide nanosheets provided in an embodiment of the present invention;

FIG. 2 is a graph of the ultraviolet absorption spectrum of molybdenum disulfide nanosheets prepared in example 1;

fig. 3 a-3 d are TEM images of molybdenum disulfide nanosheets prepared in example 1 at different magnifications.

Detailed Description

In order to make the technical solutions of the present invention better understood and implemented by those skilled in the art, the present invention is further described below with reference to the following specific embodiments and the accompanying drawings, but the embodiments are not meant to limit the present invention.

The experimental methods and the detection methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.

Example 1

A preparation method of molybdenum disulfide nanosheets, as shown in fig. 1, comprising the following steps:

(1) firstly, 0.1g of molybdenum disulfide powder is weighed, and then 60mL of DMF and 20mL of H are respectively measured by using a measuring cylinder₂O and mixing the two;

(2) mixing DMF and H₂Stirring the O mixture in a magnetic stirrer for 30min, adding molybdenum disulfide powder, and continuously stirring for 10min to prepare uniform dispersion liquid;

(3) pouring the stirred uniform dispersion liquid into a beaker, covering the beaker with a preservative film bottle mouth, and then carrying out ultrasonic treatment with the ultrasonic power of 100W and the ultrasonic time of 7 h;

(4) and transferring the mixed solution after the ultrasonic treatment into a centrifugal tube by using a burette, centrifuging the mixed solution for 20min at 2000r/min by adopting a gradient centrifugation method, taking out the mixed solution, continuously centrifuging the mixed solution for 10min at 5000r/min, and taking out the supernatant to obtain the molybdenum disulfide nanosheet dispersion.

Example 2

A preparation method of molybdenum disulfide nanosheets, as shown in fig. 1, comprising the following steps:

(1) firstly, 0.15g of molybdenum disulfide powder is weighed, and then 80mL of NMP and 20mL of H are respectively measured by using a measuring cylinder₂O and mixing the two;

(2) mixing NMP and H₂Stirring the O mixture in a magnetic stirrer for 20min, adding molybdenum disulfide powder, and continuously stirring for 20min to prepare uniform dispersion liquid;

(3) pouring the stirred uniform dispersion liquid into a beaker, covering the beaker with a preservative film bottle mouth, and then carrying out ultrasonic treatment, wherein the ultrasonic power is 200W, and the ultrasonic time is 10 h;

(4) and transferring the mixed solution after the ultrasonic treatment into a centrifugal tube by using a burette, centrifuging the mixed solution for 30min at 2500r/min by adopting a gradient centrifugation method, taking out the mixed solution, continuously centrifuging the mixed solution for 20min at 5500r/min, and taking out supernatant to obtain the molybdenum disulfide nanosheet dispersion.

Example 3

A preparation method of molybdenum disulfide nanosheets, as shown in fig. 1, comprising the following steps:

(1) firstly, 0.35g of molybdenum disulfide powder is weighed, and then 60mL of isopropanol and 20mL of H are respectively measured by using a measuring cylinder₂O and mixing the two;

(2) mixing the isopropyl alcohol and H₂Stirring the O mixture in a magnetic stirrer for 30min, adding molybdenum disulfide powder, and continuously stirring for 10min to prepare uniform dispersion liquid;

(3) pouring the stirred uniform dispersion liquid into a beaker, covering the beaker with a preservative film bottle mouth, and then carrying out ultrasonic treatment, wherein the ultrasonic power is 300W, and the ultrasonic time is 8 h;

(4) and transferring the mixed solution after the ultrasonic treatment into a centrifugal tube by using a burette, centrifuging the mixed solution for 25min at 3000r/min by adopting a gradient centrifugation method, taking out the mixed solution, continuously centrifuging the mixed solution for 20min at 6000r/min, and taking out supernatant to obtain the molybdenum disulfide nanosheet dispersion.

The properties of the materials prepared in the embodiments 1 to 3 are similar, and the following description is only given by taking the embodiment 1 as an example to perform material characterization, specifically, the molybdenum disulfide nanosheet dispersion prepared in the embodiment 1 is put into a quartz cuvette, an absorbance test is performed on the obtained molybdenum disulfide nanosheet dispersion by using an ultraviolet spectrophotometer, then a transmission sample is prepared, the transmission sample is dried in an oven at 60 ℃ for 30min, and then a TEM is used for observation, and the results are shown in fig. 2 and fig. 3.

From fig. 2, it can be clearly seen that there are two characteristic absorption peaks at 610nm and 670nm in the graph, which are characteristic absorption peaks of molybdenum disulfide nanosheet. As can be seen from fig. 3, after ultrasonic stripping, the molybdenum disulfide powder has a single-layer or few-layer sheet structure, and the size of the nanosheet is several hundred nanometers. The mechanism is that a mechanical stripping means is adopted, specifically, when ultrasonic waves with power of 100-300W are transmitted in an elastic medium, particles in the elastic medium are oscillated, molybdenum disulfide powder is violently collided, and a nanosheet is formed; the preparation method is simple, does not need complicated experimental steps, can be carried out in a common laboratory, has low equipment requirement, does not need various expensive equipment and instruments, and saves a large amount of time and scientific research cost.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that such changes and modifications be included within the scope of the appended claims and their equivalents.