Method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in polar solvents

Abstract

The present application provides a method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in polar solvents. The method disperses molybdenum disulfide nanosheets in polar solvents with different surface tensions, calculates the surface tension of the molybdenum disulfide nanosheets using the OWRK theory, and establishes a linear relationship model between the maximum dispersion concentration and the surface tension difference by comparing the difference between the surface tension of the polar solvent and the molybdenum disulfide nanosheets. The method can accurately predict the maximum dispersion concentration of molybdenum disulfide nanosheets under polar solvent conditions, and optimize the dispersibility of the nanosheets by adjusting the solvent surface tension by compounding the solvent, thereby improving the photoelectric, catalytic and other properties of the material. The method has high industrial application value, can provide a theoretical basis for the controllable dispersion and large-scale production of nanomaterials, and significantly improve material research and development and production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of nanomaterial dispersion, and in particular to a method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent. Background Art

[0002] Molybdenum disulfide (MoS2) nanosheets, a typical two-dimensional transition metal dichalcogenides (TMDCs), are widely used in fields such as photoelectric conversion, catalysis, energy storage, sensing technology, and high-performance nanocomposites due to their excellent electronic and optical properties and lubricity. Monolayer MoS2 nanosheets, in particular, have an ultra-high specific surface area and significant size effect, which can significantly improve the overall performance of materials when incorporated in small amounts into matrices such as polymers, making them an important choice for high-efficiency performance enhancers.

[0003] However, the ultra-high specific surface area of ​​MoS2 nanosheets also makes them prone to strong inter-particle attraction in the dispersion medium, which leads to agglomeration. This agglomeration not only affects the properties of the MoS2 nanosheets themselves, but also has a negative impact on the overall performance of the final material, especially in application scenarios where high dispersibility and stability need to be ensured. In order to give full play to the excellent photoelectric, catalytic and other properties of MoS2 nanosheets in composite materials, it is necessary to ensure that they remain a single layer or uniformly dispersed in the solvent or matrix. However, when the content of nanosheets is too high, the dispersibility is often seriously affected and leads to agglomeration, which in turn makes it impossible to maximize the performance of the nanosheets. Therefore, the maximum dispersible concentration of MoS2 nanosheets in the solvent becomes a key technical issue.

[0004] Chinese patent document CN117025054A, “An anti-corrosion coating of molybdenum disulfide-epoxy hydrophobic coating and its preparation method,” aims to enhance the hydrophobic properties of epoxy resin coatings by adding molybdenum disulfide nanosheets. However, due to the agglomeration and stacking of nanosheets, the coating surface is uneven, and pores and cracks of varying sizes appear after drying, affecting the overall quality of the coating. Similarly, Chinese patent document CN114836097A, “A multifunctional nano-architectural exterior wall coating and its preparation method,” develops an exterior wall coating with mildew resistance and high mechanical strength. However, during the preparation process, the ratio of water, ethanol, and polyvinyl pyrrolidone must be continuously controlled to ensure uniform dispersion of the molybdenum disulfide nanosheets in the solvent. This makes it difficult to control the dispersion concentration of the nanosheets, affecting the material’s performance stability. Therefore, there is currently a lack of an effective method to accurately determine the maximum dispersion concentration of the nanomaterial in the solvent, which is crucial for the controlled dispersion of the nanomaterial. Solving this problem can not only ensure the uniform dispersion of the nanosheets in the composite material and maximize its performance, but also promote the widespread promotion of MoS2 nanosheets in industrial applications.

[0005] In summary, predicting the highest stable dispersion concentration of MoS2 nanosheets in solvents and effectively regulating their dispersibility are crucial to ensuring their full performance and application, and have become key technical challenges in achieving large-scale application of MoS2 nanosheets. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in polar solvents. The method can predict the maximum dispersion concentration of molybdenum disulfide nanosheets in different polar solvents based on surface tension, which is of great significance for achieving controllable dispersion of molybdenum disulfide nanosheets in composite materials and their industrial application.

[0007] To achieve the above objectives, the present technical solution provides a method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent, comprising the following steps:

[0008] (1) obtaining the highest dispersion concentration of molybdenum disulfide nanosheets in at least two polar solvents with different surface tensions;

[0009] (2) Calculate the surface tension of MoS2 nanosheets;

[0010] (3) A linear relationship model was constructed based on the surface tension of the polar solvent, the surface tension of the MoS2 nanosheets, and the maximum dispersion concentration of the MoS2 nanosheets in the corresponding polar solvent;

[0011] (4) Predict the maximum dispersion concentration of MoS2 nanosheets in the target polar solvent based on the linear relationship model.

[0012] According to the present invention, in step (1), the molybdenum disulfide nanosheets are microscopically sized with a size of 1 to 10 6 nm, and nanosheets with a thickness of 0.5 to 100 nm.

[0013] According to the present invention, preferably, in step (1), the molybdenum disulfide nanosheets are single-layer or few-layer molybdenum disulfide nanosheets of 2H phase, 1T phase and 3R phase.

[0014] According to the present invention, preferably, in step (1), the molybdenum disulfide nanosheets are uniformly dispersed in a polar solvent to obtain the highest dispersion concentration. Preferably, the molybdenum disulfide nanosheets are uniformly dispersed in the polar solvent using ultrasound or stirring.

[0015] According to the present invention, preferably, in step (1), the polar solvent is selected from one or more compound solvents of water, isopropyl alcohol (IPA), ethanol (EtOH), N-methylpyrrolidone (NMP), 1,4-butanediol (BDO), and ethylene glycol (EG).

[0016] According to the present invention, preferably, in step (1), the surface tension of the polar solvent is 10 to 80 mJ / m 2 .

[0017] Preferably, according to the present invention, in step (1), molybdenum disulfide nanosheets are uniformly dispersed in a polar solvent to obtain a dispersion, the dispersion having an initial concentration of 0 to 100 g / L is centrifuged and the concentration of the supernatant after centrifugation is tested, and the maximum dispersion concentration at which the molybdenum disulfide nanosheets are stably dispersed in the corresponding polar solvent is determined based on the changing relationship between the initial concentration of the dispersion and the concentration of the supernatant after centrifugation.

[0018] According to the present invention, preferably, in step (1), the dispersion having an initial concentration of 0 to 100 g / L is centrifuged under the following centrifugal conditions: a centrifugal force range of 10 to 1200 g, and a centrifugal time of 5 to 30 minutes.

[0019] Preferably, according to the present invention, in step (1), a concentration change relationship graph is drawn with the initial concentration of the dispersion as the horizontal coordinate and the concentration of the supernatant after centrifugation as the vertical coordinate, and the slope change of the concentration change relationship graph is observed. Based on the slope change, the maximum dispersion concentration of molybdenum disulfide nanosheets stably dispersed in the corresponding polar solvent is determined.

[0020] According to the present invention, preferably, in step (1), the concentration of the centrifuged supernatant corresponding to when the initial concentration of the dispersion and the concentration of the centrifuged supernatant become negatively correlated is taken as the maximum dispersion concentration of the molybdenum disulfide nanosheets stably dispersed in the corresponding polar solvent. In other words, the concentration of the centrifuged supernatant corresponding to when the slope of the concentration change relationship graph becomes negative is taken as the maximum dispersion concentration of the molybdenum disulfide nanosheets stably dispersed in the corresponding polar solvent.

[0021] Preferably, according to the present invention, in step (2), the molybdenum disulfide nanosheets are made into a thin film, and the polar solvent same as that in step (1) is dropped on the film to measure and obtain the contact angle, and the surface tension of the molybdenum disulfide nanosheets is calculated based on the intrinsic properties of the polar solvent and the contact angle.

[0022] Preferably, according to the present invention, the OWRK theory is combined with Young's equation to obtain the following related equations:

[0023] 0.5(1+cosθ)γ L / (γ d，L ) 1 / 2 =(γ p，S ) 1 / 2 ·(γ p，L / γ d，L ) 1 / 2 +(γ d，S ) 1 / 2 ;

[0024] Where θ is the contact angle, γ L ,γ d,L ,γ p,L It is an intrinsic property of polar solvents;

[0025] The surface tension component γ of MoS2 nanosheets was obtained based on the slope and intercept of the fitting graph. d,s ,γ p,s , the sum of the surface tension components is taken as the surface tension of MoS2 nanosheets.

[0026] About the drawing of the fitting graph: (γ p，L / γ d，L ) 1 / 2 As the horizontal coordinate, 0.5(1+cosθ)γ L / (γ d，L ) 1 / 2 As the vertical coordinate, draw a fitting graph and take the square value of the slope a on the fitting graph as the first surface tension component γ d,s , take the square value of the intercept b on the fitting graph as the second surface tension component γ p,s , the surface tension of MoS2 nanosheets is calculated based on the first surface tension component and the second surface tension component:

[0027] γ S =γ p，S +γ d，S =a 2 +b 2 ;

[0028] where γ p,L is the polar component of the surface tension of the polar solvent, γ d,L is the dispersion component of the surface tension of the polar solvent, γ L is the surface tension of the polar solvent, γ p,s is the polar component of the surface tension of MoS2 nanosheets, γ d,s is the dispersion component of the surface tension of MoS2 nanosheets, γ s is the surface tension of MoS2 nanosheets, and θ is the contact angle of polar solvents with different surface tensions on the surface of MoS2 nanosheets.

[0029] Preferably, according to the present invention, in step (2), the molybdenum disulfide nanosheets are pressed or filtered to prepare a film, and the polar solvent same as that in step (1) is dropped on the film to measure and obtain the contact angle.

[0030] According to the present invention, preferably, in step (2), the volume of the droplet of the polar solvent used to test the contact angle is 0.5 to 10 μL.

[0031] Preferably, according to the present invention, in step (3), the tension difference between the surface tension of the polar solvent and the surface tension of the molybdenum disulfide nanosheets is calculated, and a fitting graph is drawn with the absolute value of the tension difference as the horizontal coordinate and the highest dispersion concentration of the molybdenum disulfide nanosheets in the corresponding polar solvent as the vertical coordinate, and a linear relationship model is constructed based on the fitting graph.

[0032] According to the present invention, the linear relationship model preferably represents the surface tension difference-maximum dispersion concentration relationship between the tension difference and the maximum dispersion concentration, wherein the intercept value represents the maximum dispersion concentration that the molybdenum disulfide nanosheets can reach in the polar solvent.

[0033] According to the present invention, the surface tension difference between the polar solvent and the surface tension of the molybdenum disulfide nanosheets is controlled to be 0 to 50 mJ / m 2 .

[0034] Preferably, according to the present invention, in step (4), the tension difference between the target polar solvent and the surface tension of the molybdenum disulfide nanosheets is calculated, and the maximum dispersion concentration of the molybdenum disulfide nanosheets in the current target polar solvent is calculated based on the tension difference and the linear relationship model.

[0035] Compared with the existing technology, this technical solution has the following characteristics and beneficial effects:

[0036] (1) The present invention provides a method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in polar solvents to predict the maximum stable dispersion concentration of molybdenum disulfide nanosheets in the preparation process of composite materials. The present invention uses the absolute value of the tension difference between the surface tension of polar solvents with different surface tensions and the surface tension of molybdenum disulfide nanosheets as the horizontal coordinate, and the maximum dispersion concentration of molybdenum disulfide nanosheets in polar solvents with different surface tensions as the vertical coordinate, and draws a graph to fit to obtain a linear relationship, that is, the absolute value of the surface tension difference-maximum dispersion concentration relationship. In the actual industrial production process, the required solvent surface tension value can be substituted into the relationship to obtain the maximum concentration of molybdenum disulfide nanosheets dispersed therein, thereby improving R&D and production efficiency and laying a foundation for the controllable dispersion and large-scale application of molybdenum disulfide nanosheets.

[0037] (2) The method of the present invention can not only be used to determine the maximum dispersion concentration of molybdenum disulfide nanosheets in a solvent, but also can be used to more quickly obtain a suitable and stable nanofiller dispersion concentration when other nanofillers are used in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Photos showing the 2H-phase molybdenum disulfide nanosheets of Example 1 of the present invention dispersed in a series of polar solvents with different surface tensions.

[0039] Figure 2The test results of the highest stable dispersion concentration of 2H-phase molybdenum disulfide nanosheets in water are shown.

[0040] Figure 3 Shown are contact angle test photos of different polar solvents on the surface of 2H phase molybdenum disulfide nanosheets in Example 1 of the present invention.

[0041] Figure 4 The surface tension calculation fitting diagram of the 2H phase molybdenum disulfide nanosheets of Example 1 of the present invention is shown.

[0042] Figure 5 The figure shows the relationship between the maximum dispersion concentration of 2H-phase molybdenum disulfide nanosheets and the surface tension difference of Example 1 of the present invention.

[0043] Figure 6 A graph showing the highest dispersion concentration of 2H-phase molybdenum disulfide nanosheets in the target solvent according to Verification Example 1 of the present invention is shown.

[0044] Figure 7 The photographs show that the 1T phase molybdenum disulfide nanosheets of Example 2 of the present invention are dispersed in a series of polar solvents with different surface tensions.

[0045] Figure 8 The test photographs of the contact angles of different solvents on the surface of 2H phase molybdenum disulfide nanosheets according to Example 2 of the present invention are shown.

[0046] Figure 9 A surface tension calculation fitting diagram of 1T phase molybdenum disulfide nanosheets according to Example 2 of the present invention is shown.

[0047] Figure 10 The figure shows the relationship between the maximum dispersion concentration and the surface tension difference of 1T phase molybdenum disulfide nanosheets in Example 2 of the present invention.

[0048] Figure 11 A graph showing the maximum concentration of 1T phase molybdenum disulfide nanosheets dispersed in a target solvent according to Verification Example 2 of the present invention is shown. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0050] Example 1

[0051] (1) 0.01 g of 2H-phase MoS2 nanosheets (thickness 1 nm) were dispersed uniformly in 10 mL of water by ultrasound to obtain a 2H-MoS2 aqueous dispersion, wherein the concentration of 2H-MoS2 was 1 g / L. The initial concentration of c was prepared in the same way. in The aqueous dispersion is 0.10-4.00 g / L. The aqueous dispersion is centrifuged (RCF is 1000 g) for 10 min and the supernatant is taken to test the concentration c of 2H-MoS2. re . With c in is the horizontal axis, corresponding to c re Plotting the vertical axis gives Figure 2 , observe the slope change, at c in When the slope is 3.0 g / L, it becomes negative. re The maximum dispersion concentration of 2H phase MoS2 nanosheets in water is 1.6 g / L. The dispersion state is shown in the following figure. Figure 1 shown.

[0052] Using the same method as above, the highest dispersion concentrations of 2H-MoS2 in IPA, EtOH, NMP, BDO, and EG were 0.4 g / L, 0.4 g / L, 7.6 g / L, 9.8 g / L, and 10.6 g / L, respectively. The dispersion state photos are shown in Figure 2. Figure 1 shown.

[0053] (2) The 2H-MoS2 nanosheets were pressed into sheets and the contact angles of water, IPA, EtOH, NMP, and EG on their surfaces were tested. The drop volume was 1 μL. The contact angle data were as follows: Figure 3 shown.

[0054] According to the Owen, Wendt, Rabel, and Kaelbl (OWRK) theory, combined with Young's equation, the intrinsic properties of the solvent (γ L ,γ d,L ,γ p,L ) and contact angle (θ):

[0055] 0.5(1+cosθ)γ L / (γ d，L ) 1 / 2 =(γ p，S ) 1 / 2 ·(γ p，L / γ d，L ) 1 / 2 +(γ d，S ) 1 / 2 ;

[0056] (γ p，L / γ d，L ) 1 / 2is the horizontal coordinate, 0.5(1+cosθ)γ L / (γ d，L ) 1 / 2 The slope a and intercept b are obtained by fitting the graph as the ordinate; the surface tension value γ of 2H-MoS2 nanosheets is obtained according to the following formula s ;

[0057] γ S =γ p，S +γ d，S =a 2 +b 2 ;

[0058] Among them, γ p,L is the polar component of the surface tension of the polar solvent, γ d,L is the dispersion component of the surface tension of the polar solvent, γ L is the total surface tension of the polar solvent, γ p,s is the polar component of the surface tension of 2H-MoS2, γ d,s is the dispersion component of the surface tension of 2H-MoS2, γ s is the total surface tension of 2H-MoS2, and θ is the contact angle of solvents with different surface tensions on the 2H-MoS2 surface.

[0059] The γ corresponding to the five polar solvents was calculated using the same method. p,L , γ d,L , γ L The contact angle data are shown in Table 1 below:

[0060] Table 1 Contact angle data in solvents of different polarities

[0061] Polar solvents <![CDATA[γ L (mJ / m 2 )]]> <![CDATA[γ p,L (mJ / m 2 )]]> <![CDATA[γ d,L (mJ / m 2 )]]> θ(°) water 72.8 50.7 22.1 55.6±8 EG 47.7 21.4 26.3 45.0±5 NMP 40.8 11.6 29.2 34.9±1 EtOH 23.7 4.4 19.3 13.1±3 IPA 23 3.5 19.5 6.6±1

[0062] Calculate γ d,s 5.7mJ / m 2 ,γ p,s 43.0mJ / m 2 , according to γ s =γ p，s +γ d，s The surface tension of 2H-MoS2 was 48.7 mJ / m 2 .

[0063] (3) Calculate the absolute value of the difference between the surface tension of water, IPA, EtOH, NMP, BDO, and EG and the surface tension of 2H-MoS2 nanosheets, and use this as the horizontal axis and the highest stable dispersion concentration in different solvents as the vertical axis for linear fitting, as shown in the following example: Figure 5 As shown, it basically conforms to the linear relationship, and the linear relationship formula C is obtained max =-0.4|Δγ|+11.0;

[0064] (4) In actual industrial production, this relationship can be substituted into the desired target solvent surface tension value to obtain the highest concentration of 2H-MoS2 nanosheets dispersed therein, laying the foundation for the controllable dispersion and large-scale application of 2H-MoS2 nanosheets.

[0065] Verification Example 1

[0066] The target solvent was prepared by mixing water and ethanol, wherein the volume fraction of ethanol was 75%. The maximum dispersion concentration of 2H-MoS2 nanosheets (thickness of 1 nm) in the target solvent was determined to be 3.6 g / L according to the method of step (1) of Example 1.

[0067] The surface tension of the target solvent is 29.8 mJ / m 2 The difference between the surface tension of 2H-MoS2 nanosheets and that of 2H-MoS2 nanosheets is 18.9 mJ / m 2 Then substitute the above difference into the relationship determined in Example 1, as Figure 6 As shown, the calculated maximum stable dispersion concentration is 3.7 g / L.

[0068] From the above comparison, it can be seen that the method of the present invention can accurately determine the maximum dispersion concentration of 2H phase molybdenum disulfide nanosheets in the target solvent.

[0069] Example 2

[0070] (1) The difference from Example 1 is that 1T phase MoS2 nanosheets are used to obtain the highest dispersion concentrations of 1T-MoS2 in IPA, EtOH, NMP, BDO, and EG, respectively, of 0.04 g / L, 0.06 g / L, 1.8 g / L, 2.0 g / L, and 2.5 g / L. The dispersion state photos are shown in FIG. Figure 7 shown.

[0071] (2) 1T-MoS2 nanosheets were pressed into sheets and the contact angles of water, IPA, EtOH, NMP, and EG on their surfaces were tested. The drop volume was 1 μL. The contact angle data were as follows: Figure 8 shown.

[0072] According to Owen, Wendt, Rabel, and Kaelble theory OWRK theory, combined with Young's equation, the intrinsic properties of the solvent (γ L ,γ d,L ,γ p,L ) and contact angle (θ):

[0073] 0.5(1+cosθ)γ L / (γ d,L ) 1 / 2 =(γ p,S) 1 / 2 ·(γ p,L / γ d,L ) 1 / 2 +(γ d,S ) 1 / 2 ;

[0074] (γ p，L / γ d，L ) 1 / 2 is the horizontal coordinate, 0.5(1+cosθ)γ L / (γ d，L ) 1 / 2 As the vertical coordinate, the slope a and intercept b are obtained by graph fitting; the surface tension value γ of 1T-MoS2 nanosheets is obtained according to the following formula s ;

[0075] γ S =γ p，S +γ d，S =a 2 +b 2

[0076] Among them, γ p,L is the polar component of the surface tension of the polar solvent, γ d,L is the dispersion component of the surface tension of the polar solvent, γ L is the total surface tension of the polar solvent, γ p,s is the polar component of the surface tension of 1T-MoS2, γ d,s is the dispersion component of the surface tension of 1T-MoS2, γ s is the total surface tension of 1T-MoS2 nanosheets, and θ is the contact angle of polar solvents with different surface tensions on the 1T-MoS2 surface.

[0077] The γ corresponding to the five polar solvents was calculated using the same method. p,L , γ d,L , γ L The contact angle data are shown in Table 2 below:

[0078] Table 2 Contact angle data in solvents of different polarities

[0079]

[0080]

[0081] Calculate γ d,s 4.9mJ / m 2 ,γ p,s 50.4mJ / m 2 , according to γ s =γ p，s +γ d，sThe surface tension of 1T-MoS2 is 55.3mJ / m 2 .

[0082] (3) Calculate the absolute value of the difference between the surface tension of water, IPA, EtOH, NMP, BDO, and EG and the surface tension of 1T-MoS2 nanosheets, and use this as the horizontal axis and the highest stable dispersion concentration in different solvents as the vertical axis for linear fitting, as shown in the following example: Figure 10 As shown, it basically conforms to the linear relationship, and the relationship C is obtained max =-0.1|Δγ|+3.1.

[0083] (4) In actual industrial production, this relationship can be substituted into the desired target solvent surface tension value to obtain the highest concentration of 1T-MoS2 nanosheets dispersed therein, laying the foundation for the controllable dispersion and large-scale application of 1T-MoS2 nanosheets.

[0084] Verification Example 2

[0085] The target solvent was prepared by mixing water and ethanol, wherein the volume fraction of ethanol was 75%. The maximum dispersion concentration of 1T-MoS2 nanosheets (thickness of 1 nm) in the target solvent was determined to be 0.7 g / L according to the method of step (1) of Example 1.

[0086] The surface tension of the target solvent is 29.8 mJ / m 2 The difference between the surface tension of the molybdenum disulfide nanosheets and that of the molybdenum disulfide nanosheets is 25.5 mJ / m 2 Then substitute the above difference into the relationship determined in Example 2, as Figure 11 As shown, the calculated maximum stable dispersion concentration is 0.6 g / L.

[0087] From the above comparison, it can be seen that the method of the present invention can accurately determine the maximum dispersion concentration of 1T phase molybdenum disulfide nanosheets in the target solvent.

[0088] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent, characterized in that: The following steps are involved: (1) Obtaining the highest dispersion concentration of MoS2 nanosheets in at least two polar solvents with different surface tensions; (2) Calculate the surface tension of MoS2 nanosheets; (3) Calculate the tension difference between the surface tension of the polar solvent and the surface tension of the MoS2 nanosheets, draw a fitting graph with the absolute value of the tension difference as the horizontal axis and the highest dispersion concentration of the MoS2 nanosheets in the corresponding polar solvent as the vertical axis, and construct a linear relationship model based on the fitting graph; (4) The maximum dispersion concentration of MoS2 nanosheets in the target polar solvent was predicted based on the linear relationship model.

2. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (1), the polar solvent is selected from one or more compound solvents of water, isopropyl alcohol (IPA), ethanol (EtOH), N-methylpyrrolidone (NMP), 1,4-butanediol (BDO), and ethylene glycol (EG).

3. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (1), the surface tension of the polar solvent is 10~80 mJ / m 2 .

4. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (1), the MoS2 nanosheets are microscopically sized at 1 to 10 6 The nanosheets are of a diameter of nm and a thickness of 0.5 to 100 nm, and the MoS2 nanosheets are single-layer or few-layer MoS2 nanosheets of 2H phase, 1T phase and 3R phase.

5. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (1), molybdenum disulfide nanosheets are uniformly dispersed in a polar solvent to obtain a dispersion, the dispersion having an initial concentration of 0 to 100 g / L is centrifuged and the concentration of the supernatant after centrifugation is tested, and the maximum dispersion concentration at which the molybdenum disulfide nanosheets are stably dispersed in the corresponding polar solvent is determined based on the relationship between the initial concentration of the dispersion and the concentration of the supernatant after centrifugation.

6. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (1), the concentration of the supernatant after centrifugation corresponding to the time when the initial concentration of the dispersion and the concentration of the supernatant after centrifugation become negatively correlated is taken as the maximum dispersion concentration of molybdenum disulfide nanosheets stably dispersed in the corresponding polar solvent.

7. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (2), the molybdenum disulfide nanosheets are made into a film, and the polar solvent used in step (1) is dropped on the film to measure and obtain the contact angle. The surface tension of the molybdenum disulfide nanosheets is calculated based on the intrinsic properties of the polar solvent and the contact angle.

8. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: Combining the OWRK theory with Young's equations yields the following related equations: ； in is the polar component of the surface tension of the polar solvent, is the dispersion component of the surface tension of the polar solvent, is the surface tension of the polar solvent, is the polar component of the surface tension of MoS2 nanosheets, Molybdenum disulfide The dispersion component of the surface tension of the nanosheet, θ is the contact of polar solvents with different surface tensions on the surface of MoS2 nanosheets horn ; The fitting graph is obtained by graph fitting based on the relevant equation, and the slope and intercept on the fitting graph are obtained. 、 ,Pick 、 and as the surface tension of MoS2 nanosheets.

9. The method for predicting the maximum dispersion concentration of molybdenum disulfide nanosheets in a polar solvent according to claim 1, wherein: In step (4), the tension difference between the target polar solvent and the surface tension of the molybdenum disulfide nanosheets is calculated, and the maximum dispersion concentration of the molybdenum disulfide nanosheets in the current target polar solvent is calculated based on the tension difference and the linear relationship model.

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