Super-hydrophobic molybdenum disulfide as well as preparation method and application thereof

Abstract

The invention relates to the technical field of functional material preparation, in particular to super-hydrophobic molybdenum disulfide and a preparation method and application thereof. The preparation method comprises the following steps: dissolving a cationic surfactant in an organic solvent to obtain a modification solution; molybdenum disulfide is soaked in the modification liquid, an external electric field is applied, passivation treatment is conducted, and the super-hydrophobic molybdenum disulfide is obtained. By introducing an external electric field induction strategy, cations in the cationic surfactant are driven to be directionally adsorbed on the surface of molybdenum disulfide at room temperature to form a compact and ordered super-hydrophobic layer, high-temperature and high-pressure or vacuum equipment is not needed, and the limitation that a hydrothermal method and a plasma method are complex in process, high in energy consumption and difficult to apply in a large area is broken through; the defects of weak coating adhesive force, complex process and poor environmental stability in the prior art are overcome.

Description

Technical Field

[0001] This invention relates to the field of functional materials preparation technology, specifically to a superhydrophobic molybdenum disulfide, its preparation method, and its applications. Background Technology

[0002] Molybdenum disulfide is a typical two-dimensional transition metal sulfide with a unique layered structure, good chemical stability, and a wide range of physicochemical properties. However, unoptimized molybdenum disulfide surfaces exhibit hydrophilic or neutral characteristics, which significantly limits its applications in interfacial wetting regulation, self-cleaning, and liquid protection.

[0003] Currently, methods for achieving superhydrophobicity on molybdenum disulfide surfaces mainly include surface roughening structure construction, low surface energy molecular physical coating, and plasma modification. Surface roughening structure construction typically requires complex processes such as nano-etching, template-assisted deposition, or laser drilling to create multi-level micro / nano-rough morphologies, thereby enhancing the hydrophobic effect; however, this method is costly, has limited repeatability, and is difficult to apply to flexible substrates or irregularly structured material surfaces. Low surface energy molecular physical coating—such as the deposition of fluorides or silane molecules on the surface—can improve hydrophobic properties, but because the coating and substrate are bound only by van der Waals forces or weak polar interactions, they are easily peeled off or fail under mechanical disturbances, chemical corrosion, or electrochemical operations, resulting in a significantly shortened lifespan. Plasma modification introduces micro / nano-rough structures and low surface energy functional groups onto the surface through ion bombardment or plasma deposition, thereby endowing the material with superhydrophobic properties. However, this method typically requires high-energy-consuming and vacuum plasma equipment, has demanding process conditions, and is limited in large-area fabrication and non-planar substrate applications.

[0004] In addition, the hydrothermal method, as an important method for material synthesis and surface modification using a high-temperature, high-pressure aqueous solution environment in a closed container, is now widely used in the synthesis and functionalization of molybdenum disulfide. Although the hydrothermal method has unique advantages such as one-step phase formation, controllable morphology, and high purity, it still has some obvious disadvantages, such as high-pressure operation risks, high equipment costs, process invisibility, long reaction time, and high energy consumption. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a superhydrophobic molybdenum disulfide, its preparation method, and its applications. This invention offers a novel solution for achieving superhydrophobic functionality on molybdenum disulfide surfaces by introducing an external electric field modulation strategy. The electric field can drive charged or polar molecules to adsorb in an orderly manner in a specific direction, significantly improving the orientation consistency and arrangement density of the modified molecules. Furthermore, electrostatic adsorption and dipole-dipole interactions enhance the interfacial forces between the modified molecules and the molybdenum disulfide substrate, thereby improving the stability and adhesion strength of the modified layer. In addition, the electric field-induced adsorption process is highly controllable and versatile, enabling rapid and selective functional modification on flexible substrates, irregular structures, and even liquid-solid interfaces, greatly expanding the applicability and engineering operability of molybdenum disulfide surface modification.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first objective of this invention is to provide a method for preparing superhydrophobic molybdenum disulfide, comprising the following steps: S1. Dissolve the cationic surfactant in anhydrous ethanol to obtain the modified solution.

[0007] S2. Molybdenum disulfide is placed at the bottom of a multifunctional electrolytic cell with a modification solution, and then an external electric field is applied for passivation treatment. Under the action of the electric field, the cations in the modification solution are directionally adsorbed on the surface of molybdenum disulfide to form a superhydrophobic layer. After separation, superhydrophobic molybdenum disulfide is obtained.

[0008] The passivation conditions are as follows: passivation at room temperature and 0.5V~2.0V for 3h~36h; when the voltage is below 0.5V, effective passivation cannot be achieved, and the superhydrophobic performance is not significant; when the voltage exceeds 2.0V, the passivation effect reaches its limit threshold, and the superhydrophobic performance will not be further enhanced.

[0009] Preferably, the mass concentration of the modifying solution is 0.01 g / L to 0.02 g / L; wherein, if the mass concentration of the modifying solution is less than 0.1 g / L, the superhydrophobic effect is not obvious; if the mass concentration of the modifying solution is greater than 0.2 g / L, the performance improvement is not significant.

[0010] Preferably, the passivation conditions are: passivation at room temperature and 1.0V for 24 hours.

[0011] Preferably, the cationic surfactant is a long-chain quaternary ammonium salt; the quaternary ammonium salt ions themselves are positively charged, which allows the external electric field to promote their interaction with molybdenum disulfide.

[0012] More preferably, the long-chain quaternary ammonium salt is selected from hexadecyltrimethylammonium bromide, dodecyltrimethylammonium bromide or octadecyltrimethylammonium bromide. Preferably, in the preparation process of superhydrophobic molybdenum disulfide, after centrifugation, a drying treatment is performed. The drying conditions are: vacuum drying at 50℃~60℃ for 12h~15h.

[0013] Preferably, molybdenum disulfide is prepared according to the following steps: Ammonium molybdate and thiourea were dissolved together in deionized water and subjected to a hydrothermal reaction at 210°C for 18 hours. After drying, molybdenum disulfide powder was obtained. The mass ratio of ammonium molybdate to thiourea was 1:2.

[0014] A second objective of this invention is to provide a superhydrophobic molybdenum disulfide prepared by the above-described preparation method.

[0015] Preferably, the superhydrophobic molybdenum disulfide is in the form of nanoflowers.

[0016] A third objective of this invention is to provide the application of the aforementioned superhydrophobic molybdenum disulfide in the preparation of superhydrophobic materials.

[0017] Preferably, the superhydrophobic material is selected from superhydrophobic powder, superhydrophobic coating or superhydrophobic film.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a method for preparing superhydrophobic molybdenum disulfide. A cationic surfactant is dissolved in anhydrous ethanol to obtain a modification solution. Molybdenum disulfide is immersed in the modification solution, and an external electric field is applied for passivation treatment. Under the action of the electric field, the cations in the modification solution are directionally adsorbed onto the surface of molybdenum disulfide, forming a superhydrophobic layer. After separation, superhydrophobic molybdenum disulfide is obtained. This invention introduces an external electric field-induced strategy to drive the cations in the cationic surfactant to directionally adsorb onto the surface of molybdenum disulfide at room temperature, forming a dense and ordered superhydrophobic layer. It eliminates the need for high-temperature, high-pressure, or vacuum equipment, overcoming the limitations of hydrothermal and plasma methods, which are complex, energy-intensive, and difficult to apply on a large scale. It also overcomes the shortcomings of existing technologies, such as weak coating adhesion (lack of precise control over interfacial adsorption selectivity and spatial configuration), complex processes (high-temperature, high-pressure synthesis and product separation and purification), and poor environmental stability (strong thermal motion and solution polarity can damage the active groups of the target molecules).

[0019] Among them, the surface of molybdenum disulfide contains abundant S. 2- Or partially oxidized groups, which usually exhibit negative charge characteristics in polar solutions, enable their surfaces to attract positively charged functional molecules through electrostatic interactions, laying the foundation for further enhancing the passivation effect with an external electric field, thereby achieving stable adsorption and surface modification.

[0020] 2. Compared with traditional physical adsorption or impregnation coating methods, the preparation method of the present invention can efficiently and stably orientedly assemble functional molecules on the surface of molybdenum disulfide while completely preserving its original structure and properties, thereby achieving superhydrophobic function. Furthermore, the hexadecyltrimethylammonium bromide layer on the surface after passivation by an external electric field has both high interfacial bonding strength and excellent environmental stability.

[0021] 3. The preparation method provided by the present invention has high controllability. By adjusting the voltage, the concentration of the modification solution and the passivation time, the adsorption rate of molybdenum disulfide surface and the thickness of the modification layer can be precisely controlled, which can be adapted to molybdenum disulfide with different morphologies and sizes, and has versatility and scalability.

[0022] 4. This invention also has good environmental adaptability and engineering compatibility. The raw material hexadecyltrimethylammonium bromide is widely available and inexpensive. The modification solution is an ethanol system, which avoids the use of highly corrosive organic solvents, making it green and safe. At the same time, the entire preparation process of this invention can be completed under normal temperature conditions, and the equipment used is simple and can be mass-produced. Attached Figure Description

[0023] Figure 1 The diagram shows unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1, where a is unmodified molybdenum disulfide, b is modified molybdenum disulfide of Comparative Example 1, and c is superhydrophobic molybdenum disulfide of Example 1.

[0024] Figure 2 Field emission scanning electron microscope (FESEM) images of unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1 are shown. In the images, a is the FESEM image of unmodified molybdenum disulfide, b is the FESEM image of modified molybdenum disulfide of Comparative Example 1, and c is the FESEM image of superhydrophobic molybdenum disulfide of Example 1. The figures for a1, b1, and c1 are all 1µm, and the figures for a2, b2, and c2 are all 2µm.

[0025] Figure 3 Field emission scanning electron microscopy (FESEM) spectra and elemental distribution maps of unmodified molybdenum disulfide and superhydrophobic molybdenum disulfide from Example 1 are shown. In the figure, a is the FESEM spectrum of unmodified molybdenum disulfide, a1 is the elemental distribution map of Mo, a2 is the elemental distribution map of S, b is the FESEM spectrum of superhydrophobic molybdenum disulfide from Example 1, b1 is the elemental distribution map of Mo, b2 is the elemental distribution map of S, and b3 is the elemental distribution map of N.

[0026] Figure 4 High-resolution XPS spectra of N in unmodified molybdenum disulfide and superhydrophobic molybdenum disulfide of Example 1 are shown, where a is the high-resolution XPS spectrum of N in unmodified molybdenum disulfide and b is the high-resolution XPS spectrum of N in superhydrophobic molybdenum disulfide of Example 1.

[0027] Figure 5 The data graph shows the zeta potential of N in unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1.

[0028] Figure 6 Fourier transform infrared spectra of N in unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1.

[0029] Figure 7 The graphs show the hydrophilicity test results of unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1. In Figure a, unmodified molybdenum disulfide has a contact time of 0 s, a1 is 0.12 s, and a3 is 0.29 s. In Figure b, modified molybdenum disulfide of Comparative Example 1 has a contact time of 0 s, b2 is 30 s, and b3 is 60 s. In Figure c, superhydrophobic molybdenum disulfide of Example 1 has a contact time of 0 s, c2 is 60 s, and c3 is 180 s.

[0030] Figure 8 Line graphs showing the contact angle of unmodified molybdenum disulfide, modified molybdenum disulfide of Comparative Example 1, and superhydrophobic molybdenum disulfide of Example 1 over time are shown. In these graphs, a is the contact angle of unmodified molybdenum disulfide over time, b is the contact angle of modified molybdenum disulfide of Comparative Example 1 over time, and c is the contact angle of superhydrophobic molybdenum disulfide of Example 1 over time. Detailed Implementation

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the data in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the technical terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased commercially or prepared by existing methods. Hexadecyltrimethylammonium bromide is denoted as CTAB.

[0033] In existing technologies, achieving superhydrophobic surfaces of molybdenum disulfide mainly relies on three methods: constructing micro / nano rough structures, low surface energy molecular physical coating, and plasma modification. Constructing rough structures often requires complex processes, such as nano-etching, laser drilling, or template methods, which are not only costly and have poor repeatability but also difficult to apply to flexible or irregular substrates. Physical coating methods, such as fluoride or silane deposition, can improve hydrophobicity, but the coating and substrate are only bonded by van der Waals forces, resulting in weak interfacial adhesion and easy peeling failure under mechanical friction, chemical corrosion, or electrochemical environments. Plasma modification can simultaneously introduce rough structures and low surface energy groups, but the equipment is expensive, energy-intensive, and poorly adaptable to large-area or non-planar substrates. Furthermore, while hydrothermal methods are widely used in the synthesis and modification of molybdenum disulfide, they suffer from drawbacks such as high pressure risks, long reaction times, high energy consumption, and uncontrollable processes.

[0034] To address the problems existing in the prior art, this invention provides a method for preparing superhydrophobic molybdenum disulfide, comprising the following steps: dissolving a cationic surfactant in anhydrous ethanol to obtain a modification solution; immersing molybdenum disulfide in the modification solution, applying an external electric field for passivation treatment, under the action of the electric field, the cations in the modification solution are directionally adsorbed onto the surface of molybdenum disulfide to form a superhydrophobic layer, and after separation, superhydrophobic molybdenum disulfide is obtained; wherein, the passivation treatment conditions are: passivation at room temperature and 0.5V~2.0V for 3h~36h.

[0035] This invention introduces an external electric field-induced strategy to drive the directional adsorption of cationic surfactants onto the surface of molybdenum disulfide at room temperature, overcoming the problems of disordered molecular stacking and weak adhesion in traditional physical coatings. By enhancing electrostatic and dipole interactions through an electric field, a dense and orderly growth of the modified layer is achieved, solving the problems of easy peeling and poor environmental stability of the coating. Through liquid-phase passivation treatment at room temperature and pressure, no high-temperature, high-pressure, or vacuum equipment is required, overcoming the limitations of hydrothermal and plasma methods, which are complex, energy-intensive, and difficult to apply on a large scale.

[0036] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the following will provide a detailed description in conjunction with specific embodiments: The method for preparing the molybdenum disulfide material used in this embodiment of the invention includes the following steps: 1.4484 g of ammonium molybdate and 2.8418 g of thiourea were dissolved in 45 mL of deionized water and then placed in a 100 mL stainless steel hydrothermal reactor. The mixture was hydrothermally reacted at 210 °C for 18 h. After the hydrothermal reaction was completed, the mixture was dried under vacuum to obtain layered molybdenum disulfide, which was designated as unmodified molybdenum disulfide.

[0037] Example 1 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 1.0 g of CTAB in 50 mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0038] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 24h at a voltage of 1V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12h to obtain superhydrophobic molybdenum disulfide.

[0039] Example 2 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 1.0 g of CTAB in 50 mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0040] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 36h at a voltage of 2V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12h to obtain superhydrophobic molybdenum disulfide.

[0041] Example 3 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 1.0 g of CTAB in 50 mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0042] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 3 hours at a voltage of 1V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12 hours to obtain superhydrophobic molybdenum disulfide.

[0043] Example 4 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 1.0 g of CTAB in 50 mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0044] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 4 hours at a voltage of 1V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12 hours to obtain superhydrophobic molybdenum disulfide.

[0045] Example 5 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 0.5g of CTAB in 50mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0046] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 36h at a voltage of 0.5V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12h to obtain superhydrophobic molybdenum disulfide.

[0047] Example 6 A method for preparing superhydrophobic molybdenum disulfide includes the following steps: S1. Dissolve 1.0 g of CTAB in 50 mL of anhydrous ethanol and stir until homogeneous to obtain the modified solution.

[0048] S2. Add 0.1g of molybdenum disulfide to an electrolytic cell containing a modification solution. Apply an external electric field through an electrochemical workstation and passivate for 36h at a voltage of 0.5V. After passivation, centrifuge, wash with ethanol, and vacuum dry at 60℃ for 12h to obtain superhydrophobic molybdenum disulfide.

[0049] Comparative Example 1 A method for preparing modified molybdenum disulfide, using a mechanical mixing modification method, includes the following steps: 0.1 g of molybdenum disulfide was dispersed in 50 mL of a mixed solution consisting of hexadecyltrimethylammonium bromide and anhydrous ethanol. The mixture was then stirred on a magnetic stirrer for 24 h. After centrifugation and washing, the mixture was vacuum dried at 60 °C for 12 h to obtain modified molybdenum disulfide.

[0050] observe Figure 1 It was found that after being induced by an electric field, the surface of molybdenum disulfide adsorbed more surfactant, namely hexadecyltrimethylammonium ions, and the resulting dense low surface energy layer endowed molybdenum disulfide with excellent superhydrophobic properties.

[0051] observe Figure 2 It was found that neither the mechanically modified molybdenum disulfide nor the superhydrophobic molybdenum disulfide prepared by the electric field-induced technique of this invention exhibited significant changes in morphology and structure. This indicates that the modification process is mild and stable, without damaging the intrinsic morphological characteristics of molybdenum disulfide. Therefore, the preparation method of this invention operates under mild conditions, and while maintaining the original morphology of the material, it can impart superhydrophobic properties simply through surface passivation treatment.

[0052] observe Figure 3 It was found that the uniform distribution of nitrogen element could be observed in the scanning electron microscope energy dispersive spectroscopy image of the superhydrophobic molybdenum disulfide of the present invention, and the nitrogen element came from hexadecyltrimethylammonium bromide, which indicates that hexadecyltrimethylammonium ions modify the surface of molybdenum disulfide.

[0053] Depend on Figure 4It was found that, compared with unmodified molybdenum disulfide, the surface of the superhydrophobic molybdenum disulfide of the present invention can detect the signal of N element, which further proves the modification of the molybdenum disulfide surface by hexadecyltrimethylammonium ions.

[0054] Depend on Figure 5 The zeta potential of unmodified molybdenum disulfide was -47 mV, indicating that the surface of molybdenum disulfide carries a negative charge, which provides a basis for the subsequent interaction between hexadecyltrimethylammonium ions and its surface. The mechanically mixed molybdenum disulfide sample was obtained by simultaneously adding molybdenum disulfide and hexadecyltrimethylammonium bromide to anhydrous ethanol and stirring. It was used to modify molybdenum disulfide by electrostatic interaction without voltage. Therefore, the zeta potential of mechanically mixed molybdenum disulfide reached -10 mV. Further research showed that the introduction of an electric field caused the zeta potential of molybdenum disulfide to change further to 7 mV, indicating that the interaction between hexadecyltrimethylammonium ions and the surface of molybdenum disulfide was stronger and the adsorption density was higher under the action of voltage.

[0055] Depend on Figure 6 The results showed that, compared with unmodified molybdenum disulfide and mechanically mixed molybdenum disulfide, superhydrophobic molybdenum disulfide exhibited better performance at 2800 cm⁻¹. -1 ~3000cm -1 The appearance of characteristic peaks within the range indicates that hexadecyltrimethylammonium ions and the molybdenum disulfide surface form an interaction, further illustrating that the interaction between hexadecyltrimethylammonium ions and the molybdenum disulfide surface is stronger and the adsorption density is higher under the action of voltage.

[0056] Depend on Figure 7 The results showed that the initial contact angle of untreated molybdenum disulfide was only 32°, and it rapidly decreased to 15° within 0.29 s, indicating significant hydrophilicity and rapid spread of water droplets on its surface. In contrast, the initial contact angle of molybdenum disulfide treated with mechanical mixing modification significantly increased to 129°, exhibiting superhydrophobicity. However, its contact angle rapidly decreased to 58.1° within 60 s, indicating that its superhydrophobic structure was unstable and could not maintain a long-term superhydrophobic state. Most notably, the molybdenum disulfide sample prepared under electric field-induced modulation exhibited an initial contact angle as high as 151°, which remained at 132° after 180 s, demonstrating excellent and stable superhydrophobic properties. This result indicates that the electric field-induced method effectively modulates the microstructure and surface energy of molybdenum disulfide, forming a stable low-surface-energy rough structure, which is an effective strategy for improving the long-term superhydrophobicity of materials.

[0057] To further quantify the wetting behavior of molybdenum disulfide surfaces under different treatment methods, Figure 8The contact angle over time was compared. The unmodified sample showed a rapid decrease in contact angle from 32° to 15° within 0.3 s, exhibiting extremely strong hydrophilicity. Although the mechanically modified sample initially showed a contact angle of 129°, it rapidly decreased to 58.1° within 60 s, indicating a significant time-dependent decay in its superhydrophobic properties. In contrast, the electric field-induced treated sample exhibited exceptionally good superhydrophobic stability, with its contact angle consistently remaining above 132° without significant decrease over a long period. This further demonstrates that the electric field-induced strategy not only significantly enhances the initial superhydrophobicity of the surface but also endows it with excellent temporal stability, making it an effective means of controlling stable superhydrophobic surfaces.

[0058] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range, as well as any value between the two endpoints, can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

Claims

1. A method for preparing superhydrophobic molybdenum disulfide, characterized in that, Includes the following steps: The cationic surfactant was dissolved in anhydrous ethanol to obtain the modified solution; Molybdenum disulfide was immersed in a modification solution and then passivated by applying an external electric field. Under the action of the electric field, the cations in the modification solution were directionally adsorbed onto the surface of molybdenum disulfide to form a superhydrophobic layer. After separation, superhydrophobic molybdenum disulfide was obtained. The passivation conditions are as follows: passivation at room temperature and 0.5V~2.0V for 3h~36h.

2. The method for preparing superhydrophobic molybdenum disulfide according to claim 1, characterized in that, The mass concentration of the modification solution is 0.01 g / L to 0.02 g / L.

3. The method for preparing superhydrophobic molybdenum disulfide according to claim 1, characterized in that, The passivation conditions were: passivation at room temperature and 1.0V for 24 hours.

4. The method for preparing superhydrophobic molybdenum disulfide according to claim 1, characterized in that, The cationic surfactant is selected from long-chain quaternary ammonium salts.

5. The method for preparing superhydrophobic molybdenum disulfide according to claim 4, characterized in that, The long-chain quaternary ammonium salt is selected from hexadecyltrimethylammonium bromide, dodecyltrimethylammonium bromide or octadecyltrimethylammonium bromide.

6. The method for preparing superhydrophobic molybdenum disulfide according to claim 1, characterized in that, Molybdenum disulfide is prepared according to the following steps: Ammonium molybdate and thiourea were dissolved together in water and subjected to a hydrothermal reaction at 210℃~220℃ for 18h~20h. After drying, molybdenum disulfide was obtained. The mass ratio of ammonium molybdate to thiourea is 1:

2.

7. A superhydrophobic molybdenum disulfide, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 6.

8. The superhydrophobic molybdenum disulfide according to claim 7, characterized in that, The superhydrophobic molybdenum disulfide exhibits a nanoflower-like structure.

9. The application of the superhydrophobic molybdenum disulfide according to claim 7 in the preparation of superhydrophobic materials.

10. The application according to claim 9, characterized in that, Superhydrophobic materials are selected from superhydrophobic powders, superhydrophobic coatings, or superhydrophobic films.

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