Cobalt-based moF material ethanol dispersion and its preparation and application in third-order nonlinear optics

Abstract

The application discloses a kind of cobalt-based MOF material ethanol dispersion and its preparation method and application in third-order nonlinear optics.The preparation method comprises: making cobalt source and organic ligand react, and prepare cobalt-based MOF material;Wherein, the organic ligand includes 1,3,5-tri (4-carboxyl phenyl acetylene group) benzene;And, the cobalt-based MOF material is mixed with ethanol and is broken by cell crushing device, and prepare cobalt-based MOF material ethanol dispersion;Wherein, the power of the breaking treatment is 30%-50%, and the temperature of condensate water in cell crushing device is controlled to be 1-5 ℃.The cobalt-based MOF material ethanol dispersion prepared by the application has excellent performance and reliability in optical third-order nonlinear characteristics, lays a solid practical foundation for the wide application of future all-optical devices, and is expected to promote the further development of optical technology in communication, sensing, information processing and other fields.

Description

TECHNICAL FIELD

[0001] The present application relates to a cobalt-based MOF material ethanol dispersion and its preparation method and application in third-order nonlinear optics, and belongs to the technical field of optical materials. BACKGROUND

[0002] The application of large-pore metal-organic framework (MOF) materials in third-order nonlinear optics has important significance. MOF materials have attracted much attention due to their unique porous structure, high specific surface area, and adjustable structure. The high porosity and adjustable chemical composition of large-pore MOF enable it to accommodate guest molecules, thereby enhancing optical performance. In addition, the coordination between metal ions and organic ligands in MOF and the weakening of non-radiative transitions caused by the restricted conformation of organic units induce the enhancement of photophysical behavior. Through structural design, composite material preparation, and external stimulus response, large-pore MOF can effectively regulate its third-order nonlinear optical properties to meet the needs of optical devices such as optical limiting and optical switching. However, the stability, processing performance, and cost of the material are still challenges currently faced, and in the future, its structure and performance need to be further optimized to promote its wide application in the field of optics. SUMMARY

[0003] The main purpose of the present application is to provide a cobalt-based MOF material ethanol dispersion and its preparation method and application in third-order nonlinear optics to overcome the shortcomings in the prior art.

[0004] To achieve the foregoing application purposes, the technical solutions adopted by the present application include:

[0005] The present application provides a preparation method of a cobalt-based MOF material ethanol dispersion, which comprises:

[0006] reacting a cobalt source with an organic ligand to obtain a cobalt-based MOF material; wherein the organic ligand comprises 1,3,5-tris(4-carboxyphenyl ethynyl) benzene;

[0007] and mixing the cobalt-based MOF material with ethanol and performing a crushing treatment using a cell crushing device to obtain a cobalt-based MOF material ethanol dispersion; wherein the crushing treatment is performed at a power of 30% to 50%, and the temperature of the condensate water in the cell crushing device is controlled at 1-5 ℃.

[0008] The present application also provides a cobalt-based MOF material ethanol dispersion prepared by the foregoing preparation method.

[0009] The present application also provides an application of the foregoing cobalt-based MOF material ethanol dispersion in third-order nonlinear optics.

[0010] This invention also provides a third-order nonlinear optical material, which includes at least the aforementioned cobalt-based MOF material ethanol dispersion.

[0011] This invention also provides an optical switch comprising the aforementioned cobalt-based MOF material ethanol dispersion; wherein the threshold optical power of the optical switch is 50 mW.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] (1) The present invention uses a simple solution method to synthesize Co-BTE macroporous MOF materials; compared with traditional methods for preparing MOF materials such as hot solvent method and liquid phase epitaxy, this simple synthesis method has significant advantages;

[0014] (2) This invention utilizes a cell crusher in conjunction with low-temperature control technology to achieve MOF particle nano-sizing and avoid structural collapse through power regulation and low-temperature crushing;

[0015] (3) This invention utilizes the MOF pore confinement effect to enhance the local electric field and achieves third-order nonlinear controllable activation under a low threshold power of 50 mW. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the process for preparing Co-BTE precipitate in Example 1 of the present invention;

[0018] Figure 2 This is a scanning electron microscope image of the Co-BTE precipitate in step 1 of embodiment 1 of the present invention;

[0019] Figure 3 This is a scanning electron microscope image of Co-BTE in the Co-BTE ethanol dispersion in step 2 of Example 1 of the present invention;

[0020] Figure 4 This is an image of the outgoing light spot with different ring numbers produced by the Co-BTE ethanol dispersion under different incident light powers under 532 nm laser excitation in Example 1 of the present invention.

[0021] Figure 5 This is the optical system diagram of optical power and number of emitted light spot rings fitted by a linear function in Embodiment 1 of the present invention. Detailed Implementation

[0022] In view of the deficiencies of the prior art, the inventors of this invention, through long-term research and extensive practice, have proposed the technical solution of this invention. This invention employs a simple solution synthesis method to prepare cobalt-based MOF materials (Co-BTE MOF materials) with large porous structures and high stability. The MOF materials are processed into an ethanol dispersion using a cell disruptor. The resulting ultrafine MOF particles significantly improve their stability in solution, and the highly dispersed MOF solution is more conducive to exciting third-order optical nonlinear phenomena.

[0023] To facilitate understanding of this application, it will be described in more detail below. However, it should be understood that the invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to provide a thorough and complete understanding of the disclosure of this invention.

[0024] Specifically, as one aspect of the technical solution of this invention, a method for preparing a cobalt-based MOF material ethanol dispersion includes:

[0025] Cobalt-based MOF materials (denoted as Co-BTE) are prepared by reacting a cobalt source with an organic ligand; wherein the organic ligand includes 1,3,5-tris(4-carboxyphenylethynyl)benzene (H3BTE).

[0026] Furthermore, the cobalt-based MOF material is mixed with ethanol and subjected to a cell disruption device to obtain a cobalt-based MOF material ethanol dispersion; wherein the power used in the disruption process is 30%~50%, and the temperature of the condensate in the cell disruption device is controlled at 1-5 ℃.

[0027] In some preferred embodiments, the cobalt source includes a divalent cobalt source.

[0028] Furthermore, the divalent cobalt source includes any one or more combinations of cobalt acetate tetrahydrate, cobalt chloride dihydrate, cobalt chloride hexahydrate, and cobalt nitrate hexahydrate, and is not limited thereto.

[0029] In some preferred embodiments, the molar ratio of the cobalt source to the organic ligand is 10~1:1~10.

[0030] In some preferred embodiments, the preparation method specifically includes:

[0031] The cobalt source and the organic ligand are dissolved in ethanol to form a cobalt source ethanol solution and an organic ligand ethanol solution, respectively.

[0032] The cobalt source ethanol solution and the organic ligand ethanol solution were thoroughly mixed and allowed to stand for 12-36 hours. After centrifugation and washing, cobalt-based MOF materials were obtained.

[0033] Further, the concentration of the cobalt source ethanol solution is 0.1~2 mmol / L, specifically 0.1 mM, 0.2 mM, 0.3 mM, 0.4 mM, 0.5 mM, 0.6 mM, 0.7 mM, 0.8 mM, 0.9 mM, 1.0 mM, 1.1 mM, 1.2 mM, 1.3 mM, 1.4 mM, 1.5 mM, 1.6 mM, 1.7 mM, 1.8 mM, 1.9 mM, or 2.0 mM.

[0034] Furthermore, the concentration of the organic ligand ethanol solution is 0.1~2 mmol / L.

[0035] In some preferred embodiments, the crushing process takes 5 to 10 minutes.

[0036] As another aspect of the technical solution of the present invention, it involves the cobalt-based MOF material ethanol dispersion prepared by the aforementioned preparation method.

[0037] This invention successfully prepared Co-BTE macroporous MOF material and further processed it into an ultrafine ethanol dispersion. In the preparation process, Co-BTE material synthesized by a simple solution method was used as the raw material. The Co-BTE precipitate immersed in ethanol was broken down using a cell disruptor, significantly reducing the particle size and enabling uniform dispersion in the ethanol solution, effectively preventing precipitation. Subsequently, the morphology, optical properties, crystal structure, and internal atomic composition of the sample were comprehensively characterized using various advanced instruments. Reducing the particle size of the MOF material not only improves its dispersibility in ethanol solution but also significantly enhances the high-temperature resistance and time stability of the dispersion. Under 532 nm laser irradiation, the Co-BTE ethanol dispersion remained stable, with no obvious precipitation at the bottom, indicating that its quality fully meets the requirements for studying third-order optical nonlinear properties. In the nonlinear property study, when the laser power gradually increased from 20 mW to 150 mW, obvious diffraction rings appeared in the emitted light spot, clearly demonstrating that the Co-BTE ethanol dispersion exhibits significant third-order optical nonlinearity. When the incident light intensity reaches 50 mW, diffraction rings begin to appear, indicating that the threshold power of the third-order nonlinearity of the Co-BTE ethanol dispersion is 50 mW. Therefore, the Co-BTE ethanol dispersion can serve as a novel optical switching material. When the optical power is below 50 mW, the third-order nonlinearity is turned off; while when the optical power is above 50 mW, the third-order nonlinearity is activated. This invention utilizes macroporous MOF materials to explore optical third-order nonlinearity and develops a novel optical switch, laying a solid scientific foundation for the widespread application of future all-optical devices.

[0038] As another aspect of the technical solution of the present invention, it involves the application of the aforementioned cobalt-based MOF material ethanol dispersion in third-order nonlinear optics.

[0039] As another aspect of the technical solution of the present invention, it relates to a third-order nonlinear optical material, which includes at least the aforementioned cobalt-based MOF material ethanol dispersion.

[0040] As another aspect of the technical solution of the present invention, it relates to an optical switch, which includes the aforementioned cobalt-based MOF material ethanol dispersion; wherein the threshold optical power of the optical switch is 50 mW.

[0041] In some preferred embodiments, when the optical switch is irradiated with an optical power of less than 50 mW, the third-order nonlinearity of the optical switch is turned off; when the optical switch is irradiated with an optical power of greater than 50 mW, the third-order nonlinearity of the optical switch is activated.

[0042] This invention employs a simplified solution method to synthesize Co-BTE macroporous MOF materials. Compared with traditional methods for preparing MOF materials, such as hot solvent methods and liquid-phase epitaxy, this simplified synthesis method has significant advantages. By utilizing a ligand pre-dispersion strategy (ethanol dissolution of H3BTE) and dynamic coordination with metal ions, it overcomes the limitation of multi-step reactions required in traditional MOF synthesis. It eliminates the need for strict control of material growth temperature, the addition of large amounts of organic matter, and precise control of the actual concentrations of metal ions and ligand ions. During the synthesis process, only a certain concentration of metal ion ethanol solution and ligand ion ethanol solution need to be mixed, followed by vigorous shaking to ensure thorough homogenization. After standing, MOF precipitate is formed. This process not only significantly saves time and operating costs but also effectively avoids the increased difficulty in cleaning MOF precipitates caused by excessive organic matter participating in the reaction, thus significantly improving the efficiency and feasibility of material preparation.

[0043] This invention utilizes a cell disruptor combined with cryogenic control technology to achieve MOF particle nano-sizing while preventing structural collapse through power regulation and low-temperature fragmentation. Freshly cleaned MOF materials, due to their unique porous structure, may adsorb a small amount of foreign impurity ions within the pores, making it difficult to disperse uniformly in ethanol solution and resulting in a precipitated state. However, after fragmentation using a cell disruptor, the particle size of the MOF material is significantly reduced, allowing for better dispersion in the ethanol solution. Even under static conditions, the fragmented MOF ethanol dispersion is unlikely to precipitate. This characteristic is crucial for the application of the dispersion in space light irradiation, ensuring not only a uniform and stable state during light irradiation but also maintaining essentially unchanged solution properties after repeated laser irradiation. This provides an important foundation for subsequent optical property research and practical applications.

[0044] This invention utilizes the pore confinement effect of MOFs to enhance the local electric field, achieving controllable third-order nonlinear activation at a low threshold power of 50 mW. Compared to many organic materials, MOFs exhibit significantly higher temporal stability, maintaining their performance over extended periods. Furthermore, compared to the stringent synthesis conditions and high preparation costs of two-dimensional materials, the MOFs in this invention require no complex processes or expensive reagents, thus significantly reducing costs and improving the material's economics and scalability. With these numerous advantages, the MOFs in this invention not only effectively excite third-order optical nonlinear phenomena, but also maintain stable excitation effects in repeated experiments without showing a significant decay trend. This demonstrates the superior performance and reliability of this MOF material in terms of third-order optical nonlinearity. This discovery lays a solid foundation for the widespread application of future all-optical devices and is expected to further promote the development of optical technology in fields such as communication, sensing, and information processing.

[0045] The present invention is further illustrated by the following embodiments: The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the specific material ratios, process conditions, and results described in the embodiments are for illustrative purposes only and should not, and will not, limit the present invention as described in detail in the claims.

[0046] Unless otherwise specified, the various raw materials, reaction equipment, testing equipment and testing methods used in the following embodiments are all known in the art.

[0047] Example 1

[0048] Step 1: Preparation of Co-BTE MOF precipitate: First, the ligand H3BTE and cobalt acetate tetrahydrate powder were dissolved in anhydrous ethanol to form a 0.5 mM solution. Then, 25 mL of each solution was mixed in equal volumes into a 50 mL centrifuge tube. The centrifuge tube was sealed and shaken up and down for 2 min to ensure thorough mixing. The mixture was then allowed to stand for 24 h to promote complete reaction between the ligand ions and the metal ions, ultimately forming a Co-BTE precipitate in the solution. Figure 1 This diagram illustrates the preparation of the MOF precipitate in this embodiment. The Co-BTE solution was then centrifuged at 8000-12000 rpm for 5-10 minutes to separate the precipitate. The precipitate was then washed with clean ethanol to remove any impurities; this process was repeated twice to ensure the Co-BTE precipitate was thoroughly clean.

[0049] Step 2: Preparation of Co-BTE ethanol dispersion: The cleaned Co-BTE precipitate from Step 1 was placed in 25 mL of ethanol solution and then disrupted using a cell disruptor. The cell disruptor power was set to 40%, the disruption time was 7 minutes, and the temperature of the cooling water was controlled at 3 °C. After disruption, the ethanol solution turned into a pale yellow MOF dispersion. After standing for more than 5 hours, no obvious precipitation occurred, indicating successful dispersion treatment.

[0050] The prepared Co-BTE precipitate and the broken Co-BTE ethanol dispersion were taken out and transferred to a clean silicon wafer. After drying at room temperature (25°C) overnight, a scanning electron microscope was turned on at 20 kV and secondary electron emission was used to observe the optical fiber structure of the MOF before and after treatment under a high vacuum environment. Figures 2-3 As shown). The Co-BTE precipitate synthesized by a simple solution method exhibits a matchstick-shaped micron-like morphology, with an average length of approximately tens of micrometers (e.g., Figure 2 As shown). After being processed by a cell disruptor, the Co-BTE in the dispersion no longer remained in a micron-like shape, but instead transformed into particles (as shown). Figure 3 (As shown). Due to the significantly reduced particle size, Co-BTE materials can be more uniformly dispersed in ethanol solutions, and are less prone to precipitation. This improved dispersion effect results in the treated Co-BTE dispersion exhibiting superior performance in exciting optical nonlinear phenomena.

[0051] Step 3: Excitation of the third-order optical nonlinearity of the Co-BTE ethanol dispersion: Take 3 mL of the Co-BTE ethanol dispersion prepared in Step 2 and place it into a four-way quartz cuvette. Focus a 532 nm laser beam using a focusing lens, ensuring the focal point accurately falls within the cuvette containing the Co-BTE ethanol dispersion. Then adjust the power of the incident light and use a camera to record the number of diffraction rings in the outgoing light spot, such as... Figure 4 As shown, when the incident light power exceeds the threshold power of 50 mW, the optical third-order nonlinear phenomenon of the Co-BTE ethanol dispersion is effectively excited, and obvious diffraction rings appear in the emitted light spot. Furthermore, the number of diffraction rings gradually increases with further increases in power. During the excitation of the third-order nonlinear phenomenon in the MOF dispersion, the incident light power can be adjusted within the range of 20-150 mW.

[0052] To evaluate the time stability of the Co-BTE ethanol dispersion in evoking optical nonlinear phenomena, three repeated experiments were conducted. In the first experiment, the laser power was gradually increased from 20 mW to 150 mW, and the diffraction ring image of the outgoing light spot was recorded using a camera. Subsequently, the laser power was gradually decreased from 150 mW back to 20 mW, and the diffraction ring image of the outgoing light spot was recorded again. The third experiment repeated the process of gradually increasing the laser power from 20 mW to 150 mW, and the corresponding diffraction ring image was recorded. The data from the three experiments were analyzed and plotted. Figure 5 The images shown were fitted using a linear function. The fitting results show that the three straight lines almost completely overlap, strongly indicating that the Co-BTE ethanol dispersion exhibits good temporal stability under cyclic laser irradiation. Furthermore, the highly consistent number of diffraction rings observed in the three experiments further confirms that the Co-BTE ethanol dispersion can stably excite third-order optical nonlinear phenomena.

[0053] In summary, this invention successfully prepared Co-BTE material using a simple solution method, and further processed the cleaned MOF material into a highly stable and high-temperature resistant ethanol dispersion using a cell disruptor. In the experiment, the MOF ethanol dispersion was irradiated with a 532 nm wavelength laser to excite its third-order optical nonlinearity. With the gradual increase of the incident laser power, the appearance and enhancement of diffraction rings in the emitted laser spot became clearly visible, indicating that the Co-BTE ethanol dispersion possesses significant optical switching characteristics. During the excitation of the third-order optical nonlinearity, the incident laser power range was set to 20-150 mW, while the threshold optical power for observing the activation of the third-order nonlinearity was 50 mW. This discovery not only confirms the application potential of MOF ethanol dispersions in the field of optical switching but also provides important experimental evidence for its further development and application in all-optical devices.

[0054] Example 2

[0055] Step 1: Preparation of Co-BTE MOF precipitate: First, the ligand H3BTE and cobalt nitrate hexahydrate powder were dissolved in anhydrous ethanol to form a 0.1 mM solution. Then, 25 mL of each solution was mixed in equal volumes into a 50 mL centrifuge tube. The centrifuge tube was sealed and shaken up and down for 2 min to ensure thorough mixing. The mixture was then allowed to stand for 12 h to promote complete reaction between the ligand ions and the metal ions, ultimately forming a Co-BTE precipitate in the solution.

[0056] Step 2: Preparation of Co-BTE ethanol dispersion: The cleaned Co-BTE precipitate from Step 1 was placed in 25 mL of ethanol solution and then disrupted using a cell disruptor. The cell disruptor power was set to 30%, the disruption time was 10 minutes, and the temperature of the cooling water was controlled at 3 °C. After disruption, the ethanol solution turned into a pale yellow MOF dispersion. After standing for more than 5 hours, no obvious precipitation occurred, indicating successful dispersion treatment.

[0057] Example 3

[0058] Step 1: Preparation of Co-BTE MOF precipitate: First, the ligand H3BTE and cobalt chloride hexahydrate powder were dissolved in anhydrous ethanol to form a 2.0 mM solution. Then, 25 mL of each solution was mixed in equal volumes into a 50 mL centrifuge tube. The centrifuge tube was sealed and shaken up and down for 2 min to ensure thorough mixing. The mixture was then allowed to stand for 36 h to promote complete reaction between the ligand ions and the metal ions, ultimately forming a Co-BTE precipitate in the solution.

[0059] Step 2: Preparation of Co-BTE ethanol dispersion: The cleaned Co-BTE precipitate from Step 1 was placed in 25 mL of ethanol solution and then disrupted using a cell disruptor. The cell disruptor power was set to 50%, the disruption time was 5 minutes, and the temperature of the cooling water was controlled at 3 °C. After disruption, the ethanol solution turned into a pale yellow MOF dispersion. After standing this dispersion for more than 5 hours, no obvious precipitation occurred, indicating that the dispersion treatment was successful.

[0060] In addition, the inventors of this case also conducted experiments with other raw materials, process operations, and process conditions described in this specification, referring to the aforementioned embodiments, and obtained relatively ideal results in all cases.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. The application of cobalt-based MOF material ethanol dispersion in third-order nonlinear optics, characterized in that, The preparation method of the cobalt-based MOF material ethanol dispersion includes: Cobalt-based MOF materials are prepared by reacting a cobalt source with an organic ligand; wherein the organic ligand is selected from 1,3,5-tris(4-carboxyphenylethynyl)benzene. Furthermore, the cobalt-based MOF material is mixed with ethanol and subjected to a cell disruption device to obtain a cobalt-based MOF material ethanol dispersion; wherein the power used in the disruption process is 30%~50%, and the temperature of the condensate in the cell disruption device is controlled at 1-5 ℃.

2. The application according to claim 1, characterized in that: The cobalt source is selected from divalent cobalt sources; wherein the divalent cobalt source is selected from any one or a combination of cobalt acetate tetrahydrate, cobalt chloride dihydrate, cobalt chloride hexahydrate, and cobalt nitrate hexahydrate; And / or, the molar ratio of the cobalt source to the organic ligand is 10~1:1~10.

3. The application according to claim 1, characterized in that, The preparation method of the cobalt-based MOF material ethanol dispersion specifically includes: The cobalt source and the organic ligand are dissolved in ethanol to form a cobalt source ethanol solution and an organic ligand ethanol solution, respectively. The cobalt source ethanol solution and the organic ligand ethanol solution were thoroughly mixed and allowed to stand for 12-36 hours. After centrifugation and washing, cobalt-based MOF materials were obtained.

4. The application according to claim 3, characterized in that: The concentration of the cobalt source ethanol solution is 0.1~2 mmol / L; and / or, the concentration of the organic ligand ethanol solution is 0.1~2 mmol / L.

5. The application according to claim 1, characterized in that: The crushing process takes 5 to 10 minutes.

6. A third-order nonlinear optical material, characterized in that, It includes at least an ethanol dispersion of cobalt-based MOF materials; The method for preparing the cobalt-based MOF material ethanol dispersion includes: Cobalt-based MOF materials are prepared by reacting a cobalt source with an organic ligand; wherein the organic ligand is selected from 1,3,5-tris(4-carboxyphenylethynyl)benzene. Furthermore, the cobalt-based MOF material is mixed with ethanol and subjected to a cell disruption device to obtain a cobalt-based MOF material ethanol dispersion; wherein the power used in the disruption process is 30%~50%, and the temperature of the condensate in the cell disruption device is controlled at 1-5 ℃.

7. The third-order nonlinear optical material according to claim 6, characterized in that: The cobalt source is selected from divalent cobalt sources; wherein the divalent cobalt source is selected from any one or a combination of cobalt acetate tetrahydrate, cobalt chloride dihydrate, cobalt chloride hexahydrate, and cobalt nitrate hexahydrate; And / or, the molar ratio of the cobalt source to the organic ligand is 10~1:1~10.

8. The third-order nonlinear optical material according to claim 6, characterized in that, The preparation method of the cobalt-based MOF material ethanol dispersion specifically includes: The cobalt source and the organic ligand are dissolved in ethanol to form a cobalt source ethanol solution and an organic ligand ethanol solution, respectively. The cobalt source ethanol solution and the organic ligand ethanol solution were thoroughly mixed and allowed to stand for 12-36 hours. After centrifugation and washing, cobalt-based MOF materials were obtained.

9. The third-order nonlinear optical material according to claim 8, characterized in that: The concentration of the cobalt source ethanol solution is 0.1~2 mmol / L; and / or, the concentration of the organic ligand ethanol solution is 0.1~2 mmol / L.

10. The third-order nonlinear optical material according to claim 6, characterized in that: The crushing process takes 5 to 10 minutes.

11. An optical switch, characterized in that, The invention includes an ethanol dispersion of cobalt-based MOF materials; wherein the threshold optical power of the optical switch is 50 mW. The preparation method of the cobalt-based MOF material ethanol dispersion includes: Cobalt-based MOF materials are prepared by reacting a cobalt source with an organic ligand; wherein the organic ligand is selected from 1,3,5-tris(4-carboxyphenylethynyl)benzene. Furthermore, the cobalt-based MOF material is mixed with ethanol and subjected to a cell disruption device to obtain a cobalt-based MOF material ethanol dispersion; wherein the power used in the disruption process is 30%~50%, and the temperature of the condensate in the cell disruption device is controlled at 1-5 ℃.

12. The optical switch according to claim 11, characterized in that: When the optical switch is irradiated with an optical power of less than 50 mW, the third-order nonlinearity of the optical switch is turned off; when the optical switch is irradiated with an optical power of greater than 50 mW, the third-order nonlinearity of the optical switch is activated.

13. The optical switch according to claim 11, characterized in that: The cobalt source is selected from divalent cobalt sources; wherein the divalent cobalt source is selected from any one or a combination of cobalt acetate tetrahydrate, cobalt chloride dihydrate, cobalt chloride hexahydrate, and cobalt nitrate hexahydrate; And / or, the molar ratio of the cobalt source to the organic ligand is 10~1:1~10.

14. The optical switch according to claim 11, characterized in that, The preparation method of the cobalt-based MOF material ethanol dispersion specifically includes: The cobalt source and the organic ligand are dissolved in ethanol to form a cobalt source ethanol solution and an organic ligand ethanol solution, respectively. The cobalt source ethanol solution and the organic ligand ethanol solution were thoroughly mixed and allowed to stand for 12-36 hours. After centrifugation and washing, cobalt-based MOF materials were obtained.

15. The optical switch according to claim 14, characterized in that: The concentration of the cobalt source ethanol solution is 0.1~2 mmol / L; and / or, the concentration of the organic ligand ethanol solution is 0.1~2 mmol / L.

16. The optical switch according to claim 11, characterized in that: The crushing process takes 5 to 10 minutes.

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