High-conductivity fabric based on Ti3C2TxMXene and preparation method thereof

Abstract

The invention provides high-conductivity Ti3C2TxMXene-based fabric and a preparation method thereof.The high-conductivity Ti3C2TxMXene-based fabric is provided with a microstructure that the surface of the fabric is wrapped by MXene lamellas, the conductive fabric is achieved in a physical friction load mode, the fabric is washed in water to remove surface impurities, MXene obtained through etching of HCl and LiF systems is used as a conductive agent, and the conductive fabric is prepared through electrostatic spinning. The conductive powder is uniformly loaded on the surface of the fabric in a multi-time friction mode, the fastness of the conductive sheet layer on the surface of the fabric is further improved in a water washing mode, the multi-time friction cleaning process is repeated, the loading capacity and uniformity of the MXene sheet layer on the surface of the fabric are improved, and finally large-scale controllable preparation of the conductive fabric with the surface modified by the MXene sheet layer is achieved. Stable presentation of the conductivity of the fabric is realized by utilizing continuous construction and optimization of a conductive network on the surface of the fabric, and the conductive fabric can express rapid electron transmission under multiple deformation conditions and is expected to be widely applied to the fields of electromagnetic shielding, electrochemical energy storage, static electricity resistance, wave absorption, electric heating and the like.

Description

Technical Field

[0001] The present invention belongs to the field of highly conductive functional fabrics, and specifically relates to a preparation method and application of highly conductive MXene-based fabrics. Background Art

[0002] In recent years, with the rapid development of smart wearable electronic devices, the demand for textiles with high conductivity, high flexibility and good integration capabilities has been growing. As a new type of two-dimensional conductive material, MXene has good surface hydrophilicity, high conductivity and other characteristics, and has shown application prospects in wearable electronic information, energy storage, energy conversion and other aspects. Fabrics constructed with polymer fibers as basic units often show basic physical and chemical properties similar to polymer materials, such as strong hydrophobicity and inert surface properties. Therefore, it is difficult to directly interact the hydrophilic MXene with it to build a stable interface, thereby achieving the high conductivity of the fabric. The current method is to increase the interaction between the two by modifying the fabric or MXene. For example, the stable loading of MXene on the fabric surface can be achieved by selecting fabrics containing specific surface hydrophilic groups (ACS Appl. Mater. Interfaces, 2020, 12, 41, 46446.), plasma treatment of the fabric surface to increase the number of active groups (Chem. Eng. J., 2022, 430, 132605.), and binder treatment (J. Colloid. Interface Sci., 2023, 629.508.). However, the above methods have the following problems: First, certain surface modifications of fabrics or MXenes often lead to the attenuation or loss of their own functions, making the electrical functions of conductive fabrics fail to reach the ideal state; second, in the production process, additional treatment methods often lead to the complication of production processes and procedures, resulting in a large amount of energy waste and reduced efficiency.

[0003] Therefore, in order to solve the current problems of complicated processes, low efficiency, and high pollution in the processing of two-dimensional conductive sheet-modified functional fabrics, it is urgent to optimize the overall processing process to ensure the good electrical properties of conductive fabrics while achieving efficient processing. Summary of the invention

[0004] The purpose of the present invention is to provide a conductive fabric based on Ti3C2T to solve the problems of complicated conductive fabric processing methods, insufficient loading fastness of conductive agents on the surface of functional fabrics, discontinuous conductive networks, etc. x MXene's highly conductive fabric and a simple and easy-to-implement preparation method enable continuous and green preparation of highly conductive fabrics.

[0005] To achieve the above object, according to the first aspect of the present invention, the following technical solutions are adopted by the present invention:

[0006] A highly conductive Ti3C2T x MXene-based fabric, characterized in that: it has a structure in which MXene nanosheets wrap the fabric; wherein, the MXene is loaded by means of friction under pressure conditions.

[0007] Further, the fabric has a thickness of 0.1 - 5 mm, and the fabric structure is woven fabric, knitted fabric, non-woven fabric or three-dimensional woven fabric.

[0008] Further, the fabric types include cotton, polyester, nylon, polytetrafluoroethylene, polyethylene or polypropylene fabrics, or a mixed woven fabric of any two or more of the above materials.

[0009] To achieve the above object, according to the second aspect of the present invention, the following technical solutions are adopted by the present invention:

[0010] Highly conductive Ti3C2T x Preparation method of MXene-based fabric, characterized in that: the specific steps are:

[0011] (1) Fabric surface cleaning: Using deionized water and ethanol as solvents for fabric surface cleaning, the fabric is ultrasonically washed in the solvent multiple times to remove excess particulate matter and grease on the surface, and dried by blowing to obtain a fabric with a clean surface;

[0012] (2) Loading of MXene: Through multiple frictions of a grinding machine under a certain pressure, multiple interactions between the MXene powder and the fabric fiber surface are realized, ensuring sufficient contact between the MXene lamellae and the fabric surface, and achieving uniform loading of the conductive layer;

[0013] (3) Enhancement of MXene loading fastness: Using ethanol fluid to rinse the fabric surface to remove MXene lamellae with low loading fastness on the fabric surface, thereby enhancing the stability of the conductive layer on the surface of the conductive fabric.

[0014] (4) Enhancement of conductive layer continuity: Repeat steps (2) and (3) to increase the loading amount of MXene, and finally achieve continuous and uniform loading of the conductive network of MXene on the fabric surface and enhancement of conductivity, realizing the large-scale construction of MXene-based conductive fabric.

[0015] Further, the MXene raw material is obtained by etching the aluminum layer through a lithium fluoride / hydrochloric acid system and centrifugally washing to neutrality. The specific description is as follows: First, 2.0 g of lithium fluoride and 40 mL of 9.0 M hydrochloric acid are mixed and stirred for 30 min to generate hydrofluoric acid, and then 1.0 g of Ti3AlC2 MAX powder is added and etched for 48 h to synthesize Ti3C2Tx MXene nanosheets. Put them into a centrifuge tube, wash the etched powder with deionized water, and then centrifuge repeatedly (at a speed of 3500 r.p.m.) until the pH of the supernatant is close to 6.0.

[0016] Further, the grinding machine chassis used is made of rubber, metal, and ceramic materials, the pressure used for grinding ranges from 0.01 to 1 MPa, and the grinding time is 1 to 10 min.

[0017] Further, in step (3), the flushing fluid pressure is 0.1 to 5 MPa, and the flushing time is 1 to 30 s.

[0018] Further, in step (4), the number of repetitions is 2 to 5 times.

[0019] Further, in step (1), the fabric is immersed in deionized water and ultrasonically treated for 5 min, then the fabric is lifted out and immersed in ethanol and ultrasonically treated for 5 min. The fabric after ultrasonic treatment to remove surface particulate impurities and grease is dried in a blast drying oven for 1 h, and finally a fabric with a clean surface is obtained.

[0020] The present invention loads MXene on the surface of the fabric by means of friction under a certain pressure. The method is simple and easy to implement, does not require modification of the fabric and MXene, and the prepared functional fabric has good electrical conductivity. Description of the Drawings

[0021] Figure 1 SEM image of the MXene-modified fabric for Example 4 Specific Embodiments

[0022] The embodiments of the present invention are described below: These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation methods and operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example 1

[0024] (1) Cleaning the fabric surface: Put a 5×5 cm polypropylene non-woven fabric into deionized water and ultrasonically wash for 5 min, then put the polypropylene non-woven fabric into an ethanol solution and ultrasonically wash for 5 min to remove surface particulate impurities and grease. Then dry the non-woven fabric in a blast drying oven at 80 °C for 1 h to obtain a fabric substrate with a clean surface.

[0025] (2) Loading of MXene conductive layer: 5 g of MXene powder was evenly dispersed on the surface of the non-woven fabric. A grinding machine with a rubber chassis was selected as the grinding tool. Under the pressure condition of 0.01 MPa, the MXene and the non-woven fabric were rubbed against each other for 1 min by the grinding machine, so that the MXene flakes could be in full contact with and interact with the fabric surface, realizing the in-situ loading of the conductive agent on the fabric surface.

[0026] (3) Improvement of fastness: First, the unloaded MXene powder on the surface of the non-woven fabric was removed by shaking. In order to further improve the adhesion of the MXene flakes on the fabric surface, the MXene-loaded fabric was rinsed with an ethanol stream at a pressure of 0.1 Mpa for 20 s to remove the MXene flakes that were not fully loaded or had insufficient loading fastness on the surface layer, improving the overall loading fastness and continuity of the conductive layer on the fabric surface.

[0027] (4) Repeated loading: In order to obtain a highly conductive MXene-based conductive fabric, the above steps (2) and (3) were repeated on the conductive fabric 2 times to increase the loading amount and fastness of the MXene flakes on the surface of the non-woven fabric, and finally a conductive fabric with a conductivity of 15 Ω was achieved.

[0028] Example 2

[0029] (1) Cleaning of fabric surface: A 5×5 cm polyester fabric was placed in deionized water and ultrasonically washed for 5 min. Then the polypropylene non-woven fabric was placed in an ethanol solution and ultrasonically washed for 5 min to remove the particulate impurities and grease on the surface. Then the non-woven fabric was dried in a blast drying oven at 80 °C for 1 h to obtain a fabric substrate with a clean surface.

[0030] (2) Loading of MXene conductive layer: 5 g of MXene powder was evenly dispersed on the surface of the non-woven fabric. A grinding machine with a rubber chassis was selected as the grinding tool. Under the pressure condition of 0.1 MPa, the MXene and the non-woven fabric were rubbed against each other for 2 min by the grinding machine, so that the MXene flakes could be in full contact with and interact with the fabric surface, realizing the in-situ loading of the conductive agent on the fabric surface.

[0031] (3) Improvement of fastness: First, the unloaded MXene powder on the surface of the non-woven fabric was removed by shaking. In order to further improve the adhesion of the MXene flakes on the fabric surface, the MXene-loaded fabric was rinsed with an ethanol stream at a pressure of 0.5 Mpa for 5 s to remove the MXene flakes that were not fully loaded or had insufficient loading fastness on the surface layer, improving the overall loading fastness and continuity of the conductive layer on the fabric surface.

[0032] (4) Repeated loading: To obtain a highly conductive MXene-based conductive fabric, repeat the above steps (2) and (3) three times for the conductive fabric to increase the loading amount and fastness of MXene sheets on the surface of the non-woven fabric, and finally achieve a conductive fabric with a conductivity of 30 Ω.

[0033] Example 3

[0034] (1) Fabric surface cleaning: Place a 5×5 cm polytetrafluoroethylene cloth into deionized water and ultrasonically wash it for 5 min. Then, put the polypropylene non-woven fabric into an ethanol solution and ultrasonically wash it for 5 min to remove the particulate impurities and grease on the surface. Next, dry the non-woven fabric in a blast drying oven at 80 °C for 1 h to obtain a fabric substrate with a clean surface.

[0035] (2) Loading of the MXene conductive layer: Evenly disperse 5 g of MXene powder on the surface of the non-woven fabric. Select a grinding machine with a rubber chassis as the grinding tool. Under a pressure condition of 0.2 MPa, use the grinding machine to rub MXene and the non-woven fabric against each other for 5 min, so that the MXene sheets can fully contact and interact with the fabric surface, realizing the in-situ loading of the conductive agent on the fabric surface.

[0036] (3) Fastness improvement: First, remove the unloaded MXene powder on the surface of the non-woven fabric by shaking. To further improve the adhesion of MXene sheets on the fabric surface, rinse the MXene-loaded fabric with an ethanol stream at a pressure of 4 Mpa for 40 s to remove the MXene sheets that are not fully loaded or have insufficient loading fastness on the surface layer, and improve the overall loading fastness and continuity of the conductive layer on the fabric surface.

[0037] (4) Repeated loading: To obtain a highly conductive MXene-based conductive fabric, repeat the above steps (2) and (3) four times for the conductive fabric to increase the loading amount and fastness of MXene sheets on the surface of the non-woven fabric, and finally achieve a conductive fabric with a conductivity of 50 Ω.

[0038] Example 4

[0039] (1) Fabric surface cleaning: Place a 5×5 cm nylon fabric into deionized water and ultrasonically wash it for 5 min. Then, put the polypropylene non-woven fabric into an ethanol solution and ultrasonically wash it for 5 min to remove the particulate impurities and grease on the surface. Next, dry the non-woven fabric in a blast drying oven at 80 °C for 1 h to obtain a fabric substrate with a clean surface.

[0040] (2) Loading of MXene conductive layer: Spread 5 g of MXene powder evenly on the surface of the non-woven fabric. Select a grinding machine with a rubber chassis as the grinding tool. Under the condition of a pressure of 1 MPa, use the grinding machine to rub MXene and the non-woven fabric against each other for 10 min, so that the MXene flakes can be in full contact and interaction with the fabric surface, realizing the in-situ loading of the conductive agent on the fabric surface.

[0041] (3) Improvement of fastness: First, remove the unloaded MXene powder on the surface of the non-woven fabric by shaking. In order to further improve the adhesion of the MXene flakes on the fabric surface, rinse the MXene-loaded fabric with an ethanol stream at a pressure of 10 Mpa for 60 s to remove the MXene flakes that are not fully loaded or have insufficient loading fastness on the surface layer, and improve the overall loading fastness and continuity of the conductive layer on the fabric surface ( Figure 1 ).

[0042] (4) Repeated loading: In order to obtain a highly conductive MXene-based conductive fabric, repeat the above steps (2) and (3) on the conductive fabric 5 times to increase the loading amount and fastness of the MXene flakes on the non-woven fabric surface, and finally achieve a conductive fabric with a conductivity of 6 Ω.

Claims

1. A highly conductive Ti3C2T x MXene-based fabric, characterized in that: It has a structure with MXene nanosheets wrapped on the surface of the fabric; among them, the MXene is loaded by means of friction under pressing conditions.

2. A highly conductive Ti3C2T x MXene-based fabric, characterized in that The fabric has a thickness of 0.1 - 5 mm, and the fabric structure is woven fabric, knitted fabric, non-woven fabric or three-dimensional woven fabric.

3. A highly conductive Ti3C2T x MXene-based fabric, characterized in that The types of fabrics include cotton, polyester, nylon, polytetrafluoroethylene, polyethylene or polypropylene fabrics, or a mixed woven fabric of any two or more of the above materials.

4. The method for preparing a highly conductive Ti3C2T x MXene-based fabric, characterized in that: Specific steps: (1) Cleaning the fabric surface: Using deionized water and ethanol as solvents for cleaning the fabric surface, ultrasonically washing the fabric in the solvents multiple times to remove excess particulate matter and grease on the surface, and drying it with air blast to obtain a fabric with a clean surface. (2) Loading of MXene: Through multiple frictions of the grinding machine under a certain pressure, multiple interactions between the MXene powder and the surface of the fabric fibers are achieved, and uniform loading of the conductive layer is realized. (3) Improving the loading fastness of MXene: Using ethanol fluid to rinse the fabric surface to remove the MXene lamellae with relatively low loading fastness on the fabric surface, thereby improving the stability of the conductive layer on the surface of the conductive fabric. (4) Improving the continuity of the conductive layer: Repeating steps (2) and (3) to increase the loading amount of MXene, and finally realizing the continuous and uniform loading of MXene on the fabric surface and the improvement of conductivity.

5. The preparation method according to claim 4, characterized in that, The MXene raw material is obtained by etching the aluminum layer through the lithium fluoride / hydrochloric acid system and then centrifugally washing it to neutrality.

6. The preparation method according to claim 4, characterized in that, The chassis of the grinding machine used is made of rubber, metal and ceramic materials, the pressure range for grinding is 0.01 - 1 MPa, and the grinding time is 1 - 10 min.

7. The preparation method according to claim 4, wherein In step (3), the pressure of the rinsing fluid is 0.1 - 5 MPa, and the rinsing time is 1 - 30 s.

8. The washing process after multiple loadings according to claim 3 for obtaining a more continuous conductive layer, characterized in that, In step (4), the number of repetitions is 2 - 5 times.

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