A preparation method of a friction nanogenerator based on F-MXene

Abstract

The application discloses a preparation method of a friction nanogenerator based on F-MXene, which integrates the performances of the electrode material and the friction material. Fluorine-containing silane is selected to perform surface fluorination modification on MXene to prepare F-MXene dispersion liquid; the F-MXene dispersion liquid is filtered on an organic nylon filter membrane through a vacuum filtration method, and the F-MXene film which can be used as both the electrode material and the friction material is obtained after being dried on the surface and being removed; the F-MXene film is assembled with a PDMS film containing amino groups to construct the friction nanogenerator. When the friction nanogenerator prepared by the application is used as a sensing device, the sensing hysteresis problem can be improved, and the response time is relatively short, being 40 ms; when the friction nanogenerator is used as an energy conversion device, the charge loss caused by interlayer sliding can be reduced, and the open circuit voltage is relatively high, being 530 V.

Description

Technical Field

[0001] This invention belongs to the field of sensing materials technology, specifically relating to a method for preparing a triboelectric nanogenerator based on F-MXene. Background Technology

[0002] Triboelectric nanogenerators (TGNs) possess advantages such as a wide range of material choices, simple structure, and low cost, and have proven to have great potential in fields such as self-powered flexible sensors, wearable devices, and intelligent robots. Currently, TGNs are mainly constructed from independent friction layers and electrode layers, with the friction layer typically made of polymers and the electrode layer typically made of conductive materials. When applied to energy conversion, the relative sliding between the independent friction layer and electrode layer increases charge loss, affecting the output performance of the TGN. Furthermore, when applied to flexible sensors, the viscoelasticity of polymers can lead to sensing hysteresis, affecting the sensor's response time. Summary of the Invention

[0003] The purpose of this invention is to provide a method for fabricating a triboelectric nanogenerator based on F-MXene. This addresses the shortcomings of existing triboelectric nanogenerators when applied to energy conversion and flexible sensors.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0006] Step 1: Surface modification of monolayer MXene is performed by using fluorinated silane to fluorinate the surface of MXene, so that the hydroxyl groups on MXene undergo dehydration condensation with the fluorinated silane, and fluorine groups with strong electron-withdrawing ability are introduced into the surface of MXene to obtain F-MXene dispersion.

[0007] Step 2: Vacuum filter the F-MXene dispersion. By adjusting the amount of F-MXene, the output voltage is increased. 1.0 to 3.0 mL of the F-MXene dispersion is filtered through a sand core filter onto an organic nylon filter membrane. After the surface dries, it is peeled off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0008] Step 3: Using an amino-containing PDMS film as the triboelectric positive layer, an electrode is formed on its back side. The F-MXene film obtained in Step 2 is used as the triboelectric negative layer and electrode layer. The two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining a triboelectric nanogenerator based on F-MXene.

[0009] Furthermore, step one specifically includes the following steps:

[0010] 1) Add 0.1g to 0.5g of fluorinated silane to 5.0mL to 10.0mL of ethanol solution, and react in a 60℃ water bath with a magnetic stirrer for 1.0h to 1.5h to obtain FOTS alcohol solution;

[0011] 2) Weigh 0.1g to 0.5g of monolayer MXene and add it to FOTS alcohol solution. React under the above conditions for 2.0 to 2.5h to obtain a fluorinated MXene dispersion with an MXene:FOTS ratio of 1.0:0.2 to 1.0:1.0. After ultrasonic treatment for 15 to 30min, F-MXene dispersion is obtained.

[0012] Further, the fluorinated silane mentioned in step 1) is 1H,1H,2H,2H-perfluorodecyltriethoxysilane or 1H,1H,2H,2H-perfluorooctyltriethoxysilane.

[0013] The present invention has the following advantages:

[0014] This invention yields MXene films rich in fluorine groups, which can be used simultaneously as both a friction material and an electrode material for triboelectric nanogenerators. When used as a sensing device, the fabricated triboelectric nanogenerator improves sensing hysteresis, exhibiting a short response time of 40 ms; when used as an energy conversion device, it reduces charge loss due to interlayer sliding, achieving a high open-circuit voltage of 530 V.

[0015] Instruction manual illustrations

[0016] Figure 1 The graph shows the response time test results of the triboelectric nanogenerator constructed in Example 5 of this invention. Detailed Implementation

[0017] The following detailed description of specific embodiments further illustrates the above-described content of the present invention, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common methods in the art without departing from the technical concept of the present invention should be included within the scope of protection of the present invention.

[0018] Example 1:

[0019] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0020] Step 1: Add 0.2g FOTS to 10.0mL ethanol solution and react in a 60℃ water bath with a magnetic stirrer for 1.0h to obtain FOTS ethanol solution. Weigh 0.46g monolayer MXene and add it to the FOTS ethanol solution. React under the above conditions for 2.0h to obtain F-MXene dispersion with an MXene:FOTS ratio of 1.0:0.8. After ultrasonic treatment for 30min, F-MXene dispersion is obtained.

[0021] Step 2: Filter 2.0 mL of F-MXene dispersion through a sand core filter onto an organic nylon filter membrane. After the surface dries, peel it off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0022] Step 3: Using amino-containing PDMS as the triboelectric positive layer, an electrode is formed on its back side. Using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining the aforementioned F-MXene-based triboelectric nanogenerator.

[0023] Example 2:

[0024] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0025] Step 1: Add 0.2g FOTS to 10.0mL ethanol solution and react in a 60℃ water bath with a magnetic stirrer for 1.0h to obtain a FOTS ethanol solution. Weigh 0.46g monolayer MXene and add it to the FOTS ethanol solution. React under the above conditions for 2.0h to obtain an F-MXene dispersion with an MXene:FOTS ratio of 1.0:0.4. Sonicate the dispersion for 30min to obtain an F-MXene dispersion.

[0026] Step 2: Filter 1.5 mL of F-MXene dispersion through a sand core filter onto an organic nylon filter membrane. After the surface dries, peel it off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0027] Step 3: Using amino-containing PDMS as the triboelectric positive layer, an electrode is formed on its back side. Using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining the aforementioned F-MXene-based triboelectric nanogenerator.

[0028] Example 3:

[0029] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0030] Step 1: Add 0.2g FOTS to 10.0mL ethanol solution and react in a 60℃ water bath with a magnetic stirrer for 1.0h to obtain a FOTS ethanol solution. Weigh 0.46g monolayer MXene and add it to the FOTS ethanol solution. React under the above conditions for 2.0h to obtain an F-MXene dispersion with an MXene:FOTS ratio of 1.0:0.4. Sonicate the dispersion for 30min to obtain an F-MXene dispersion.

[0031] Step 2: Filter 1.0 mL of F-MXene dispersion through a sand core filter onto an organic nylon filter membrane. After the surface dries, peel it off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0032] Step 3: Using amino-containing PDMS as the triboelectric positive layer, an electrode is formed on its back side. Using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining the aforementioned F-MXene-based triboelectric nanogenerator.

[0033] Example 4:

[0034] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0035] Step 1: Add 0.2g FOTS to 10.0mL ethanol solution and react in a 60℃ water bath with a magnetic stirrer for 1.0h to obtain a FOTS ethanol solution. Weigh 0.46g monolayer MXene and add it to the FOTS ethanol solution. React under the above conditions for 2.0h to obtain an F-MXene dispersion with an MXene:FOTS ratio of 1.0:0.6. Sonicate the dispersion for 30min to obtain an F-MXene dispersion.

[0036] Step 2: Filter 2.0 mL of F-MXene dispersion through a sand core filter onto an organic nylon filter membrane. After the surface dries, peel it off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0037] Step 3: Using amino-containing PDMS as the triboelectric positive layer, an electrode is formed on its back side. Using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining the aforementioned F-MXene-based triboelectric nanogenerator.

[0038] Example 5:

[0039] A method for preparing a triboelectric nanogenerator based on F-MXene includes the following steps:

[0040] Step 1: Add 0.2g FOTS to 10.0mL ethanol solution and react in a 60℃ water bath with a magnetic stirrer for 1.0h to obtain a FOTS ethanol solution. Weigh 0.46g monolayer MXene and add it to the FOTS ethanol solution. React under the above conditions for 2.0h to obtain an F-MXene dispersion with an MXene:FOTS ratio of 1.0:0.4. Sonicate the dispersion for 30min to obtain an F-MXene dispersion.

[0041] Step 2: Filter 2.0 mL of F-MXene dispersion through a sand core filter onto an organic nylon filter membrane. After the surface dries, peel it off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer.

[0042] Step 3: Using amino-containing PDMS as the triboelectric positive layer, an electrode is formed on its back side. Using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining the aforementioned F-MXene-based triboelectric nanogenerator.

Claims

1. A method for preparing a triboelectric nanogenerator based on F-MXene, characterized in that, Includes the following steps: Step 1: Surface modification of monolayer MXene is performed by using fluorinated silane to fluorinate the surface of MXene, so that the hydroxyl groups on MXene undergo dehydration condensation with the fluorinated silane, and fluorine groups with strong electron-withdrawing ability are introduced into the surface of MXene to obtain F-MXene dispersion. Step 2: Vacuum filter the F-MXene dispersion. By adjusting the amount of F-MXene, the output voltage is increased. 1.0 ~ 3.0 mL of F-MXene dispersion is filtered through a sand core filter onto an organic nylon filter membrane. After the surface dries, it is peeled off to obtain an F-MXene membrane that can be used as both an electrode layer and a friction layer. Step 3: Using an amino-containing PDMS film as the triboelectric positive layer and forming an electrode on its back side, and using the F-MXene film obtained in Step 2 as the triboelectric negative layer and electrode layer, the two triboelectric layers are connected with polypropylene tape, while ensuring that there is a certain gap between the two triboelectric layers, thus obtaining a triboelectric nanogenerator based on F-MXene. Step one specifically includes the following steps: 1) Add 0.1 g ~ 0.5 g of fluorinated silane to 5.0 mL ~ 10.0 mL of ethanol solution, and react in a 60 ℃ water bath with a magnetic stirrer for 1.0 h ~ 1.5 h to obtain FOTS alcohol solution; 2) Weigh 0.1 g to 0.5 g of monolayer MXene and add it to FOTS alcohol solution. React under the above conditions for 2.0 to 2.5 h to obtain a fluorinated MXene dispersion with an MXene:FOTS ratio of 1.0:0.2 to 1.0:1.

0. After ultrasonic treatment for 15 to 30 min, F-MXene dispersion is obtained.

2. The method for preparing a triboelectric nanogenerator based on F-MXene according to claim 1, characterized in that, The fluorinated silane mentioned in step 1) is 1H,1H,2H,2H-perfluorodecyltriethoxysilane or 1H,1H,2H,2H-perfluorooctyltriethoxysilane.

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