Optically driven frictional reversible conversion film and method for manufacturing the same

Abstract

The application belongs to the technical field of nanometer materials, and discloses a light-driven friction-reversible conversion film and a preparation method thereof.The friction-reversible conversion film provided by the application comprises an azobenzene-functionalized silane monolayer fiber film, the azobenzene-functionalized silane monolayer fiber film comprises an azobenzene sulfonyl chloride compound and a substrate, and the azobenzene sulfonyl chloride compound comprises an azobenzene group and a sulfonyl chloride group connected to each other.The film changes the conformation of the azobenzene-functionalized silane monolayer fiber film by irradiating different light and applying mechanical force, and the isomerization also changes the friction of the film, so that the light-driven friction-reversible conversion is realized, and the film can be widely applied to nanometer-level electromechanical and optoelectronic devices requiring friction regulation, and has a good application prospect.

Description

Technical Field

[0001] This invention belongs to the field of nanomaterials technology and relates to a light-driven triboelectric reversible conversion film and its preparation method. Background Technology

[0002] With the rapid development of nanotechnology and optics, nanoscale electromechanical and optoelectronic devices are emerging in large numbers. Friction has a crucial impact on the performance, lifespan, and reliability of these devices. While friction can provide necessary stability and control under certain conditions, it can also lead to energy loss, wear, and functional failure in others. Therefore, rationally controlling the magnitude of friction is one of the key technologies for optimizing high-performance nanoscale electromechanical and optoelectronic devices. Current technologies often employ methods such as using lubricants, surface texturing, and replacing materials with different friction coefficients. However, challenges remain, including the difficulty in precisely controlling the friction of materials at the nanoscale and the challenge of achieving simple and rapid regulation of friction in complex environments. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a light-driven triboelectric reversible conversion film and its preparation method.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A light-driven triboelectric reversible conversion membrane, the membrane comprising an azobenzene-functionalized silane monolayer fiber membrane, the azobenzene-functionalized silane monolayer fiber membrane comprising an azobenzene sulfonyl chloride compound and a substrate;

[0006] The azobenzenesulfonyl chloride compound comprises an azophenyl group and a sulfonyl chloride group.

[0007] Azobenzene is a class of aromatic compounds containing -N=N- groups. Its molecular structure consists of two benzene rings linked by an azo group (-N=N-), thus azobenzene compounds contain a conjugated π system and exhibit strong absorption peaks in the ultraviolet to visible red light range, allowing them to interconvert between cis and trans isomers. Azobenzene sulfonyl chloride compounds containing azobenzene therefore also possess photoisomerization properties. The conformational change mechanism of the azobenzene molecule is shown below:

[0008]

[0009] Spinning technology can be used to spin solutions containing azobenzenesulfonyl chloride compounds into nanofibers, forming nanofiber membranes with high specific surface area and porous structure. The high specific surface area of ​​nanofibers is conducive to the uniform distribution of photoresponsive molecules, improving the photoresponse efficiency of the membrane; the porous structure can increase the flexibility and mechanical properties of the membrane, making it less susceptible to damage during light-driven triboelectric transformation.

[0010] Preferably, the substrate is a silicon substrate. Functionalized silicon (Si) substrates possess high mechanical strength and stability, providing a robust support platform for azobenzenesulfonyl chloride compound films and ensuring the structural integrity of the film during preparation and use. Silicon substrates typically have very flat surfaces, which facilitates the formation of uniform nanofiber films and improves the surface quality of the film.

[0011] Preferably, the substrate is a functionalized silicon substrate; the functionalized silicon substrate is a silicon substrate treated with a silane coupling agent, wherein the silane coupling agent is 3-aminopropyltriethoxysilane. 3-Aminopropyltriethoxysilane (APTES) introduces amino (-NH2) groups onto the surface of the silicon substrate through a chemical reaction. These amino groups provide chemically active sites for subsequent grafting of azobenzenesulfonyl chloride compounds. The azobenzenesulfonyl chloride compounds form covalent bonds with the APTES-functionalized Si substrate layer through the amino groups, thereby firmly adhering to the Si substrate surface and preventing the film from detaching or being damaged during photo-driven triboelectric conversion.

[0012] Preferably, the azophenyl group further includes an R group at position 4; the R group is any one of -N(CH3)2, -COOH, -OH, -CH3, and -CH2CH3. Among the R groups, -N(CH3)2 (dimethylamino), -COOH (carboxyl), and -OH (hydroxyl) are hydrophilic groups; while -CH3 (methyl) and -CH2CH3 (ethyl) are hydrophobic groups.

[0013] Preferably, the sulfonyl chloride group is located at the meta or para position of the azophenyl group. If the sulfonyl chloride group is located at the para position of the azophenyl group, the azobenzenesulfonyl chloride compound in the prepared azobenzene-functionalized silane monolayer fiber membrane is vertically distributed on the APTES-functionalized silicon-Si substrate; if the sulfonyl chloride group is located at the meta position of the azophenyl group, there is a certain tilt angle between the azobenzenesulfonyl chloride compound and the APTES-functionalized silicon-Si substrate.

[0014] The azobenzenesulfonyl chloride compounds described in this invention are selected from 4-dimethylaminophenylazobenzenesulfonyl chloride (DABS-Cl), and their molecular structural formula is as follows: 4-Carboxyazobenzenesulfonyl chloride, its molecular structural formula is 4-Hydroxyazobenzenesulfonyl chloride, its molecular structural formula is 4-Methylazobenzenesulfonyl chloride, its molecular structural formula is

[0015] for 4-Ethylazobenzenesulfonyl chloride, its molecular structural formula is 4-Azobenzene-4'-sulfonyl chloride, its molecular structural formula is 4-Dimethylaminophenylazobenzene-5'-sulfonyl chloride, its molecular structural formula is 4-Carboxyazobenzene 5'-sulfonyl chloride, its molecular structural formula is 4-Hydroxyazobenzene 5'-sulfonyl chloride, its molecular structural formula is 4-Methylazobenzene 5'-sulfonyl chloride, its molecular structural formula is 4-Ethylazobenzene 5'-sulfonyl chloride, its molecular structural formula is Or 4-azobenzene 5'-sulfonyl chloride, its molecular structural formula is

[0016] As a general technical concept, the present invention also provides a method of using a light-driven triboelectric reversible conversion film, wherein the film is in a first state, and the film is irradiated with ultraviolet light to obtain a film in a second state;

[0017] When the membrane is in the second state, it is irradiated with visible light or subjected to mechanical force to obtain the membrane in the first state; wherein the azophenyl group in the membrane in the first state is in the trans conformation, and the azophenyl group in the membrane in the second state is in the cis conformation.

[0018] Preferably, the mechanical force is applied via an atomic force microscope (AFM), and the visible light is blue light. In this invention, the mechanical force of an atomic force microscope (AFM) is used to induce direct cis-trans isomerization of an azobenzene-functionalized silane monolayer. An AFM is a high-resolution surface analysis tool used to observe and measure the morphology, mechanical properties, and electrical properties of sample surfaces. The working principle of AFM is based on the interaction forces between the probe and the sample surface; changes in these forces are detected to construct a three-dimensional image of the sample surface. Unlike conventional methods that stretch azo bonds, AFM introduces a mechanical force as a vector, effectively compressing rather than elongating the molecule. This force provides the energy required to release the metastable cis conformation and triggers a transition to the lower-energy trans conformation.

[0019] As a general technical concept, the present invention also provides a method for preparing a light-driven triboelectric reversible conversion film, comprising the following steps:

[0020] (1) The silicon substrate was ultrasonically cleaned and then hydroxylated. After being dried with a protective gas, it was immersed in a freshly prepared organic solution of 0.04M 3-aminopropyltriethoxysilane for mixing and reaction. After cleaning, it was dried with a protective gas to obtain a 3-aminopropyltriethoxysilane-functionalized silicon substrate.

[0021] (2) Dissolve the azobenzenesulfonyl chloride compound in an organic solvent and stir thoroughly until completely dissolved to prepare a spinning solution;

[0022] (3) Inject the spinning solution prepared in step (2) into the injection pump of the electrospinning machine, start electrospinning, spray out fine filaments, and deposit them onto the 3-aminopropyltriethoxysilane-functionalized silicon substrate obtained in step (1) to form an azobenzene-functionalized silane nanofiber membrane.

[0023] (4) The azobenzene-functionalized silane nanofiber membrane obtained in step (3) is dried to remove residual solvent and then cured to obtain the light-driven triboelectric reversible conversion membrane.

[0024] Preferably, in step (1), the silicon substrate is ultrasonically cleaned with acetone, ethanol and deionized water respectively, three times for each, for 5 minutes each time. The hydroxylation treatment is to soak the Si substrate in a solution of concentrated sulfuric acid and hydrogen peroxide mixed in a volume ratio of 7:3 for 15 minutes. The protective gas is argon.

[0025] Preferably, the organic solvent in step (1) is methanol; the methanol solution of 3-aminopropyltriethoxysilane is prepared by mixing methanol with deionized water, adjusting the pH to 4.5-5.5 with 1mM acetic acid, then adding 3-aminopropyltriethoxysilane, stirring at room temperature for 5 minutes, with methanol accounting for 94% by volume, deionized water accounting for 5% by volume, and 3-aminopropyltriethoxysilane accounting for 1% by volume; then rinsing with a water:ethanol (V:V = 1:1) mixed solution and ethanol in sequence, and drying with argon gas.

[0026] Preferably, in step (2), the organic solvent is acetone, and the mass ratio of the azobenzenesulfonyl chloride compound to acetone is 1:10 to 30.

[0027] Preferably, the electrospinning parameters in step (3) are: voltage 10-30kV, spinning solution supply speed 0.1-1.0mL / h, and receiving distance 10-20cm; in step (3), the drying temperature is 60-80℃ and the drying time is 2-4h; the curing method is heat treatment, the temperature is 100-150℃ and the treatment time is 1-3h.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) Nanofiber membranes prepared from azobenzenesulfonyl chloride compounds and APTES-functionalized silicon substrates undergo a trans-to-cis conformational transition under ultraviolet light irradiation, entering the second state. The azobenzene molecules in the membrane fold, reducing the surface height and increasing the area occupied by individual molecules, thus increasing the contact area and consequently increasing the frictional force. Under blue light irradiation or AFM mechanical force, the cis-to-trans conformational transition occurs, and the azobenzene membrane reverts to the first state, the expanded state, with increased surface height, decreased area occupied by individual molecules, decreased contact area, and decreased frictional force. Therefore, the conformation of azobenzene molecules in the membrane can be changed by irradiating with different lights and applying AFM mechanical force. Isomerization also alters its tribological properties, thereby achieving a reversible transformation of light-driven tribology.

[0030] (2) Atomic force microscopy introduces mechanical force in a vector to provide the energy required for the release of metastable cis conformation by compressing molecules and triggers the conversion process to the lower energy trans conformation. Moreover, the application of local mechanical force can induce cis-trans isomerization of monolayer throughout the entire region, realize a wide range of photoresponsibility changes, and promote monolayer cis-trans nanolithography (CTNL).

[0031] (3) The prepared azobenzene-functionalized nanofiber membrane has good mechanical strength and flexibility, and can maintain the integrity and stability of the structure during the light-driven triboelectric transformation process. This allows the membrane to maintain good performance even after multiple light-driven triboelectric transformations. Attached Figure Description

[0032] The invention will now be further described with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram showing the photo-induced isomerization changes of the light-driven triboelectric reversible conversion film prepared in Example 1 under different light irradiation and mechanical force.

[0034] Figure 2 The image shows a surface scanning electron microscope (SEM) image of the light-driven triboelectric reversible transformation film prepared in Example 1.

[0035] Figure 3 The height and friction changes of the light-driven triboelectric reversible conversion film prepared in Example 1 before and after UV light irradiation.

[0036] Figure 4 The image shows the changes in height and friction force of the light-driven triboelectric reversible conversion film prepared in Example 1 under blue light or AFM mechanical force.

[0037] Figure 5 The height and friction force change curves of the light-driven triboelectric reversible conversion film prepared in Example 1 under blue light or AFM mechanical force. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be described in detail below. The described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0039] This invention provides a light-driven reversible electrospun membrane, comprising azophenyl groups and sulfonyl chloride groups linked together, and a substrate. The azophenyl groups are the core component of this electrospun membrane, representing a type of molecular switch capable of photoisomerization. A 1.5 cm substrate is selected. 2 Si <100> Substrate (p-Si, heavily doped), Si <100> Silicon with crystalline faces possesses good mechanical strength and stability, which is beneficial for maintaining the integrity of the substrate and the mechanical properties of the final product during the subsequent preparation of reversible conversion films. p-type Si substrates are suitable for preparing materials with specific optical absorption characteristics. Surface modification of the Si substrate using APTES allows the amino groups at the ends of the APTES molecules to serve as active sites for linking molecules, thereby facilitating subsequent chemical reactions with azobenzenesulfonyl chloride compounds, enabling the successful grafting of azobenzene molecules onto the silicon substrate. Furthermore, the silyl groups in the APTES molecules can form covalent bonds on the silicon substrate surface, thereby enhancing the adhesion between the azobenzenesulfonyl chloride compounds and the silicon substrate.

[0040] In the embodiments of the present invention, the 4-position of the azophenyl group may further include an R group, which may be -N(CH3)2, -COOH, -OH, -CH3, or -CH2CH. 3， Among them, -N(CH3)2, -COOH, and -OH are hydrophilic groups, while -CH3 and -CH2CH3 are hydrophobic groups. The hydrophilicity or hydrophobicity of the R groups affects the adhesion of the final film. Thus, during subsequent atomic force microscopy (AFM) analysis, the presence of hydrophilic groups increases surface roughness and polarity, causing the probe to apply greater force when scanning the film surface, resulting in greater frictional force. Conversely, hydrophobic groups reduce surface polarity and roughness, decreasing adhesion and frictional force during probe detection.

[0041] In the embodiments of the present invention, the sulfonyl chloride group can be located at the para or meta position of the azophenyl group. When the sulfonyl chloride group is located at the para position of the azophenyl group, the azobenzenesulfonyl chloride compound is vertically distributed on the APTES-functionalized silicon-Si substrate in the final reversible conversion membrane. This results in a smooth surface, making it easier to change the reversible conversion membrane from a cis to a trans conformation when using AFM mechanical force to alter its conformation. However, if the sulfonyl chloride group is located at the meta position of the azophenyl group, the azobenzenesulfonyl chloride compound is distributed at a certain tilt angle on the APTES-functionalized silicon-Si substrate. When using AFM mechanical force to change its conformation, the tilted azobenzenesulfonyl chloride compound, arranged at an angle on the silicon substrate, also results in a tilted reversible conversion membrane. Consequently, applying the same amount of mechanical force reduces the conversion rate from a cis to a trans conformation, increasing the difficulty of AFM detection and resulting in a poor conformational conversion effect in the prepared reversible conversion membrane.

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] Example 1

[0044] A light-driven triboelectric reversible conversion membrane, comprising an azobenzene-functionalized silane monolayer fiber membrane, wherein the azobenzene-functionalized silane monolayer membrane comprises 4-dimethylaminophenylazobenzenesulfonyl chloride (DABS-Cl, Silicon (Si) substrates functionalized with 3-aminopropyltriethoxysilane (APTES).

[0045] The specific preparation method includes the following steps:

[0046] (1) Place 1.5cm 2 Si <100> The substrate (p-Si, highly doped) was ultrasonically cleaned in acetone, ethanol and deionized water in sequence, three times for 5 minutes each time; then it was immersed in a solution of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 70%:30% for 15 minutes, cleaned with deionized water and then dried with argon gas.

[0047] (2) Mix methanol and deionized water at a volume ratio of 94%:5%, adjust the pH to 5.5 with 1mM acetic acid, add 1% APTES by volume, stir at room temperature for 5 min to prepare a 0.04M APTES methanol solution; immerse the cleaned Si substrate in the 0.04M APTES methanol solution for 20 min, rinse with water:ethanol (V:V = 1:1) mixed solution and ethanol in sequence, and dry with argon to obtain an APTES functionalized Si substrate;

[0048] (3) Dissolve DABS-Cl in acetone, with a mass ratio of DABS-Cl to acetone of 1:20, and stir thoroughly until completely dissolved to prepare a spinning solution.

[0049] (4) The spinning solution was injected into the injection pump of the electrospinning machine at a supply rate of 1.0 mL / h. The voltage of the electrospinning machine was 10 kV and the receiving distance was 12 cm. It was deposited on the APTES-functionalized Si substrate to obtain an azobenzene-functionalized silane nanofiber membrane.

[0050] (5) The azobenzene-functionalized silane nanofiber membrane was placed in an oven at 65°C and dried for 4 hours to remove residual solvent. Then, it was heat-treated at 150°C for 2 hours to obtain a light-driven triboelectric reversible conversion membrane.

[0051] Example 2

[0052] A light-driven triboelectric reversible conversion membrane, comprising an azobenzene-functionalized silane monolayer fiber membrane, wherein the azobenzene-functionalized silane monolayer fiber membrane comprises 4-dimethylaminophenylazobenzene-5'-sulfonyl chloride (molecular formula: Silicon (Si) substrates functionalized with 3-aminopropyltriethoxysilane (APTES).

[0053] The specific preparation method includes the following steps:

[0054] (1) Place 1.5cm 2 Si <100> The substrate (p-Si, highly doped) was ultrasonically cleaned in acetone, ethanol and deionized water in sequence, three times each, for 5 minutes each time; then it was immersed in a piranha solution made of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 70%:30% for 15 minutes, cleaned with deionized water and then dried with argon gas.

[0055] (2) Mix methanol and deionized water at a volume ratio of 94%:5%, adjust the pH to 4.5 with 1mM acetic acid, add 1% APTES by volume, stir at room temperature for 5 min to prepare a 0.04M APTES methanol solution; immerse the cleaned Si substrate in the 0.04M APTES methanol solution for 20 min, rinse with water:ethanol (V:V = 1:1) mixed solution and ethanol in sequence, and dry with argon gas to obtain an APTES functionalized Si substrate;

[0056] (3) Dissolve 4-dimethylaminophenylazobenzene-5'-sulfonyl chloride in acetone, with a mass ratio of 4-dimethylaminophenylazobenzene-5'-sulfonyl chloride to acetone of 1:15. Stir thoroughly until completely dissolved to prepare a spinning solution.

[0057] (4) The spinning solution was injected into the injection pump of the electrospinning machine at a supply rate of 0.1 mL / h. The voltage of the electrospinning machine was 15 kV and the receiving distance was 10 cm. The solution was deposited on the APTES-functionalized Si substrate to obtain an azobenzene-functionalized silane nanofiber membrane.

[0058] (5) The azobenzene-functionalized silane nanofiber membrane was placed in an oven at 60°C and dried for 3 hours to remove residual solvent. Then, it was heat-treated at 100°C for 3 hours to obtain a light-driven triboelectric reversible conversion membrane.

[0059] Comparative Example 1

[0060] A light-driven triboelectric reversible conversion membrane, which is composed of azobenzene monomers.

[0061] The specific preparation method includes the following steps:

[0062] (1) Dissolve azobenzene in acetone, with a mass ratio of azobenzene to acetone of 1:10, and stir thoroughly until completely dissolved to prepare a spinning solution.

[0063] (2) The spinning solution was injected into the injection pump of the electrospinning machine at a supply rate of 0.5 mL / h. The voltage of the electrospinning machine was 20 kV and the receiving distance was 20 cm to obtain an azobenzene functionalized nanofiber membrane.

[0064] (3) The azobenzene-functionalized nanofiber membrane was placed in an oven at 80°C and dried for 2 hours to remove residual solvent. Then, it was heat-treated at 130°C for 1 hour to obtain a light-driven triboelectric reversible conversion membrane.

[0065] Comparative Example 2

[0066] A membrane made of polylactide.

[0067] The specific preparation method includes the following steps:

[0068] (1) Dissolve 10g of polylactide in 100g of hexafluoroisopropanol to prepare a polylactide solution, and stir thoroughly to obtain an electrospun film solution.

[0069] (2) The electrospun membrane solution was injected into the injection pump of the electrospinning machine at a flow rate of 1 mL / h. The voltage of the electrospinning machine was 12 kV and the receiving distance was 14 cm to obtain a polylactide membrane.

[0070] The products prepared in Examples 1-2 and Comparative Examples 1-2 were selected for testing:

[0071] The surface adhesion, friction, and surface height of the prepared reversible conversion film were tested by applying ultraviolet light and AFM mechanical force.

[0072] Ultraviolet (UV) irradiation parameters: UV light wavelength: 365nm; UV irradiation time: 208s, irradiating the sample surface, causing the trans conformation to change to the cis conformation.

[0073] AFM mechanical force parameters: LFM mode, 30 nN load applied via AFM, scanning area 5 × 5 μm 2 It controls the change from cis to trans conformation.

[0074] Combination Figure 1 and Figure 3 The film prepared in Example 1, after being irradiated with ultraviolet light at a wavelength of 365 nm for 208 s, changed from a trans conformation to a cis conformation. The azophenyl groups in DABS folded, the surface height decreased, but the contact area increased, and the frictional force also increased accordingly; Figure 4 and Figure 5 It is known that when irradiated with blue light or subjected to AFM mechanical force, the membrane reverts from the cis conformation to the trans conformation. The azophenyl groups in DABS expand, increasing the surface height, but the contact area decreases accordingly, resulting in a decrease in friction. Furthermore, due to the presence of dimethylamino hydrophilic groups in DABS, the adhesion between the AFM probe tip and the membrane surface increases when AFM mechanical force is applied, thus increasing friction as well. In Example 2, a reversible conversion membrane was prepared using 4-dimethylaminophenylazobenzene-5'-sulfonyl chloride. Since the sulfonyl chloride group is located at the meta position of the azophenyl group, the prepared membrane is tilted. When a mechanical force of 30 nN is applied to it, the conversion rate from the cis conformation to the trans conformation decreases, thus leading to a poorer effect of frictional change.

[0075] Comparative Example 1 is a reversible conversion membrane prepared using azobenzene monomer. Although the azobenzene monomer can still undergo photo-induced isomerization, the absence of R groups and substrate results in no adhesion and minimal change in friction. In Comparative Example 2, the membrane prepared without azobenzene molecules cannot change its friction under light or mechanical force.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A light-driven triboelectric reversible conversion film, characterized in that, The light-driven triboelectric reversible conversion membrane includes an azobenzene-functionalized silane monolayer fiber membrane, which comprises an azobenzene sulfonyl chloride compound and a substrate; The azobenzenesulfonyl chloride compound includes an attached azophenyl group and a sulfonyl chloride group; The azophenyl group further includes an R group at position 4; the R group is any one of -N(CH3)2, -COOH, -OH, -CH3, -CH2CH3; the sulfonyl chloride group is located at the meta or para position of the azophenyl group; The method of using the light-driven triboelectric reversible conversion film includes: When the azophenyl group in the photo-driven triboelectric reversible conversion film is in the trans conformation, the photo-driven triboelectric reversible conversion film is irradiated with ultraviolet light to obtain a film in the cis conformation of the azophenyl group. When the azophenyl group in the photo-driven triboelectric reversible conversion film is in the cis conformation, the photo-driven triboelectric reversible conversion film is irradiated with blue light or mechanical force is applied by an atomic force microscope to obtain a film in the trans conformation of the azophenyl group.

2. The light-driven triboelectric reversible conversion film according to claim 1, characterized in that, The substrate is a silicon substrate.

3. The light-driven triboelectric reversible conversion film according to claim 1, characterized in that, The substrate is a functionalized silicon substrate; the functionalized silicon substrate is a silicon substrate treated with a silane coupling agent, and the silane coupling agent is 3-aminopropyltriethoxysilane.

4. A method for preparing a light-driven triboelectric reversible conversion film according to any one of claims 1-3, characterized in that, Includes the following steps: (1) After ultrasonic cleaning of the silicon substrate, hydroxylation treatment is performed. After drying with protective gas, it is immersed in a freshly prepared organic solution of 0.04M 3-aminopropyltriethoxysilane for mixing and reaction. After cleaning, it is dried with protective gas to obtain a 3-aminopropyltriethoxysilane-functionalized silicon substrate. (2) Dissolve the azobenzenesulfonyl chloride compound in an organic solvent and stir thoroughly until completely dissolved to prepare a spinning solution; (3) Inject the spinning solution prepared in step (2) into the injection pump of the electrospinning machine, start electrospinning, spray out fine filaments, and deposit them onto the 3-aminopropyltriethoxysilane-functionalized silicon substrate obtained in step (1) to form an azobenzene-functionalized silane nanofiber membrane. (4) The azobenzene-functionalized silane nanofiber membrane obtained in step (3) is dried to remove the residual solvent and then cured to obtain the light-driven triboelectric reversible conversion membrane.

5. The method for preparing a light-driven triboelectric reversible conversion film according to claim 4, characterized in that, In step (1), the silicon substrate is selected from 1.5 cm² Si <100> The substrate is p-type. The silicon substrate is placed in a mixture of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 7:3 for hydroxylation treatment. The protective gas is argon. The organic solvent in step (2) is acetone, and the mass ratio of azobenzenesulfonyl chloride compound to acetone is 1:10~30.

6. The method for preparing a light-driven triboelectric reversible conversion film according to claim 4, characterized in that, The electrospinning parameters in step (3) are: voltage 10~30kV, spinning solution supply speed 0.1~1.0mL / h, and receiving distance 10~20cm; in step (4), the drying temperature is 60~80℃ and the drying time is 2~4h; the curing treatment method is heat treatment, the temperature is 100~150℃ and the treatment time is 1~3h.

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