Cu NWs-MXene composite material for transparent electrode and preparation method thereof

Abstract

The application discloses a copper nanowire (Cu NWs)-MXene composite material for a transparent electrode and a preparation method thereof, and the preparation method comprises the following steps: preparing copper nanowires; mixing appropriate lithium fluoride with hydrochloric acid, then adding Ti3AlC2 for selective etching, centrifuging the obtained reaction liquid for multiple times to obtain MXene nanosheets; spraying the prepared copper nanowires on a substrate, and immersing the substrate with the copper nanowires into the MXene nanosheet solution to form a copper nanowire-MXene transparent electrode. The high conductivity of the copper nanowires and the hydrophilicity and strong oxidation resistance of the MXene material are utilized, the stable combination of the copper nanowires and the substrate is realized, the firmness of the combination of the conductive film and the substrate is improved, meanwhile, the MXene nanosheets cover the lines and the space between the lines of the copper nanowire grid, a bridge is provided for electron transmission, and the contact resistance is reduced. The attachment of the MXene on the surface of the nanowires greatly avoids the contact between the copper nanowires and air, and the performance stability of the transparent electrode is improved.

Description

Technical Field

[0001] This invention belongs to the field of Cu NWs material technology, specifically relating to a Cu NWs-MXene composite material for transparent electrodes and its preparation method. Background Technology

[0002] Since tin-doped indium tin oxide (ITO) was used in flat panel displays in 1970, ITO has become the most commonly used transparent conductive films (TCFs) material. Through continuous optimization, ITO has demonstrated excellent conductivity; experiments show that its sheet resistance reaches 3 Ohm / sq (ohms per square centimeter) at 95% transmittance, making it the preferred material for transparent conductive films. However, indium, as a rare element, has a content of only 0.1 ppm in the Earth's crust, which greatly limits its price. On the other hand, electronic devices are increasingly developing into flexible devices that are bendable, foldable, and able to withstand stress. ITO, being a metal oxide, is brittle and will crack and break when the strain reaches 2%. These problems with ITO have led to the search for new materials to replace it. Many research institutions are actively developing second-generation conductive film materials, hoping to apply them in production as soon as possible.

[0003] In recent years, due to the excellent conductivity of metal nanowires, their application in conductive thin films has generated great anticipation and enthusiasm. Since Lee et al. first used silver nanowires to prepare conductive thin films with conductivity comparable to ITO in 2008, researchers have conducted extensive studies on the preparation process, performance optimization, application areas, and long-term stability of silver nanowires. With process improvements, transparent conductive films made from silver nanowires achieved a resistivity of only 32 Ohm / sq at a transmittance of up to 95%. However, silver nanowires suffer from electromigration when current is applied, which can easily lead to the failure of the conductive film within a short period. Copper nanowires have resistivities very close to those of silver nanowires, but their price is only one-thousandth that of silver nanowires, and they do not have the electromigration problem. However, copper nanowires are highly susceptible to oxidation, becoming the most challenging aspect of preparing conductive thin films. Existing methods for processing copper nanowire conductive films are mostly complex and costly, highlighting the urgent need to develop a novel, simple, and rapid method for preparing high-performance copper nanowire conductive films. Summary of the Invention

[0004] To address the issues of easy oxidation of Cu NWs and high brittleness of ITO, this invention provides a Cu NWs-MXene composite material for transparent electrodes and its preparation method. The composite transparent electrode prepared by this method is flexible, solving the problem of high ITO brittleness and preventing Cu NWs oxidation. The use of MXene nanosheets further prevents Cu NWs oxidation while increasing the effective contact area between the nanowire meshes, reducing resistance, and improving stability. The technical problem solved by this invention is achieved through the following technical solution:

[0005] One aspect of the present invention provides a method for preparing a Cu NWs-MXene composite material for a transparent electrode, comprising:

[0006] S1: Preparation of copper nanowires;

[0007] S2: Mix an appropriate amount of lithium fluoride with hydrochloric acid, then add Ti3AlC2 for selective etching, and centrifuge the resulting reaction liquid multiple times to obtain MXene nanosheets.

[0008] S3: The prepared copper nanowires are sprayed onto the substrate, and the substrate with copper nanowires is immersed in MXene nanosheet solution to form a copper nanowire-MXene transparent electrode.

[0009] In one embodiment of the present invention, S1 includes:

[0010] An appropriate amount of CuCl2, glucose and octadecylamine were pre-dissolved in deionized water and stirred thoroughly. The mixture was then placed in a drying oven and heated to carry out a hydrothermal reaction, which allowed copper atoms in the solution to grow into copper nanowires. The mixture was then cooled to room temperature.

[0011] After the hydrothermal reaction was completed, the solution was washed and centrifuged to obtain copper nanowires, which were then dissolved in isopropanol solution for storage.

[0012] In one embodiment of the present invention, the copper nanowire has an average diameter of 60 nm and a length of 10-100 μm.

[0013] In one embodiment of the present invention, S2 includes:

[0014] Weigh 1-2.8 mg of lithium fluoride and 20 ml of 9-12 mol / L hydrochloric acid and stir in a 100 ml polytetrafluoroethylene reaction vessel for 10-30 min. Add 1 g of Ti3AlC2 and stir continuously at 25-45℃ for 24 h.

[0015] Centrifuge the obtained reaction liquid, discard the supernatant after centrifugation, add deionized water to the precipitate, sonicate and centrifuge, repeat several times until the pH value of the liquid poured out after centrifugation is greater than 6.

[0016] Collect the precipitate and dilute it to 150 ml. Sonicate for 30-90 min to separate the layers. Then centrifuge for 10-30 min and collect the upper layer solution, which is MXene nanosheets.

[0017] In one embodiment of the present invention, the MXene nanosheet is Ti3C2T. X The average area is 2-6 μm. 2 .

[0018] In one embodiment of the present invention, S3 includes:

[0019] The prepared copper nanowire solution was taken out and sonicated for 15-60 minutes. It was then added to a spray gun, and the cleaned PET substrate was dried with nitrogen. The distance between the spray gun and the substrate was then adjusted, and the copper nanowire solution was sprayed onto the PET substrate. The sprayed copper nanowire transparent electrode was then immersed in glacial acetic acid solution for 5-30 minutes, and then dried.

[0020] The prepared MXene nanosheet solution was then placed on a magnetic stirrer at a speed of 200-700 rpm, and the copper nanowire transparent electrode was immersed in it. After a certain period of time, it was removed, dried, and a copper nanowire-MXene transparent electrode was formed.

[0021] Open the vacuum drying oven and heat it to between 170-230℃. Place the copper nanowire-MXene transparent electrode inside, turn on the vacuum pump, and remove it after vacuum annealing.

[0022] Another aspect of the present invention provides a Cu NWs-MXene composite material for a transparent electrode, prepared using the preparation method described in any one of the above embodiments.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention creatively applies the advantages of MXene and copper nanowires, combining the advantages of the two materials to achieve a synergistic effect greater than the sum of its parts. Utilizing the high conductivity of copper nanowires and the hydrophilicity and high conductivity of MXene, a stable bond between the copper nanowires and the substrate is achieved, improving the stability of the transparent electrode. Simultaneously, the MXene nanosheets act as bridges between the lines of the copper nanowire mesh, increasing the contact area between the lines and facilitating electron transport. Furthermore, since copper nanowires are prone to oxidation, transparent electrodes are highly susceptible to failure, a problem effectively solved by MXene. Its adhesion to the surface of the nanowires greatly avoids contact between the copper nanowires and air, thus improving the performance stability of the transparent electrode.

[0025] 2. This invention creatively proposes a method for treating copper nanowires with glacial acetic acid and then vacuum annealing, which simplifies the preparation of transparent copper nanowire electrodes and enables large-scale preparation. Compared with previous sintering methods, vacuum annealing only requires a vacuum drying oven, which is simple, easy to operate, and inexpensive. It eliminates the need for the inert gas step and does not require overly complex instruments, thus achieving economic efficiency.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0027] Figure 1 This is a flowchart of a method for preparing Cu NWs-MXene composite material for transparent electrodes provided in an embodiment of the present invention;

[0028] Figure 2 This is an XRD pattern of Cu NWs synthesized by hydrothermal method according to an embodiment of the present invention;

[0029] Figure 3 This is an XRD pattern of an in-situ synthesized MXene nanosheet provided in an embodiment of the present invention;

[0030] Figure 4 This is a thermogravimetric curve of Cu NWs synthesized by hydrothermal method according to an embodiment of the present invention.

[0031] Figure 5 These are SEM images of Cu NWs-MXene composite materials prepared using the method described in this embodiment of the invention.

[0032] Figure 6 This is a graph showing the relationship between sheet resistance and transmittance of Cu NWs-MXene composite material prepared using the method of this embodiment of the invention.

[0033] Figure 7 This is a schematic diagram of the structure of Cu NWs-MXene composite material prepared using the method of this embodiment of the invention. Detailed Implementation

[0034] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following describes in detail, with reference to the accompanying drawings and specific embodiments, a Cu NWs-MXene composite material for transparent electrodes and its preparation method according to the present invention.

[0035] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes said element.

[0037] Example 1

[0038] Please see Figure 1 , Figure 1 This is a flowchart illustrating a method for preparing a Cu NWs-MXene composite material for a transparent electrode according to an embodiment of the present invention. The preparation method includes:

[0039] S1: Preparation of copper nanowires.

[0040] Specifically, appropriate amounts of CuCl2, glucose, and octadecylamine were pre-dissolved in deionized water and stirred thoroughly before being placed in a forced-air drying oven. The mixed solution was then heated to undergo a hydrothermal reaction, causing copper atoms in the solution to grow into copper nanowires. The solution was then cooled to room temperature. After the hydrothermal reaction was completed, the solution was washed and centrifuged to obtain copper nanowires, which were then dissolved in isopropanol for storage. The average diameter of the copper nanowires was 60 nm, and the length was 10-100 μm.

[0041] S2: Mix an appropriate amount of lithium fluoride with hydrochloric acid, then add Ti3AlC2 to carry out a selective etching reaction. Centrifuge the resulting reaction liquid multiple times to obtain MXene nanosheets.

[0042] Specifically, 1-2.8 mg of lithium fluoride and 20 ml of 9-12 mol / L hydrochloric acid are weighed and stirred in a 100 ml polytetrafluoroethylene reactor for 10-30 min. 1 g of Ti3AlC2 is added, and the mixture is stirred continuously at 25-45℃ for 24 h. The resulting reaction liquid is centrifuged, and the supernatant is discarded. Deionized water is added to the precipitate, and the mixture is sonicated and centrifuged repeatedly until the pH of the centrifuged liquid is greater than 6. The precipitate is collected and diluted to 150 ml, sonicated for 30-90 min to separate the layers, and then centrifuged again for 10-30 min to collect the supernatant solution, which is MXene nanosheets. The MXene nanosheets are Ti3C2T. X The average area is relatively large, specifically 2-6 μm. 2 .

[0043] S3: The prepared copper nanowires are sprayed onto the substrate, and the substrate with copper nanowires is immersed in MXene nanosheet solution to form a copper nanowire-MXene transparent electrode.

[0044] Specifically, the prepared copper nanowire solution is taken out and sonicated for 15-60 minutes, then added to a spray gun. A cleaned PET substrate is dried with nitrogen gas. The distance between the spray gun and the substrate is then adjusted, and the copper nanowire solution is sprayed onto the PET substrate. The sprayed copper nanowire transparent electrode is immersed in glacial acetic acid solution for 5-30 minutes, then removed and dried. Next, the prepared MXene nanosheet solution is placed on a magnetic stirrer at a speed of 200-700 rpm, and the copper nanowire transparent electrode is immersed in it. After a certain period of time, it is removed and dried to form a copper nanowire-MXene transparent electrode. A vacuum drying oven is opened and heated to 170-230℃. The copper nanowire-MXene transparent electrode is placed in the oven, and the vacuum pump is turned on. After vacuum annealing for 30-60 minutes, it is removed.

[0045] In this embodiment, the purpose of vacuum annealing is to burn off the residual copper oxide and surface sealing agent, so that the connection between the nanowire meshes changes from a simple overlap to a more robust knot, increasing the effective contact area between the wires, reducing sheet resistance, and removing the moisture remaining during the dip-coating process of the nanosheets.

[0046] This invention creatively utilizes the advantages of MXene and copper nanowires, combining the strengths of both materials to achieve a synergistic effect. By leveraging the high conductivity of copper nanowires and the hydrophilicity and high conductivity of MXene, a stable bond between the copper nanowires and the substrate is achieved, improving the stability of the transparent electrode. Simultaneously, the MXene nanosheets act as bridges between the lines of the copper nanowire mesh, increasing the contact area between them. Furthermore, since copper nanowires are prone to oxidation, transparent electrodes are highly susceptible to failure, a problem effectively solved by MXene. Its adhesion to the nanowire surface significantly reduces contact between the copper nanowires and air, thus improving the performance stability of the transparent electrode.

[0047] Example 2

[0048] Based on Example 1, this example provides another method for preparing Cu NWs-MXene composite materials, the preparation method comprising:

[0049] Step 1: Preparation of copper nanowires (Cu NWs):

[0050] 215.2 mg CuCl2, 288 mg glucose, and 2587.2 mg octadecylamine were pre-dissolved in 120 ml deionized water to form a mixed solution. This solution was mixed with a magnetic stirrer for 2-6 hours, then transferred to a polytetrafluoroethylene (PTFE) reaction vessel, which was then sealed and placed in a drying oven. The solution was heated from room temperature to 120°C and maintained at this temperature for 24 hours to induce a hydrothermal reaction, allowing copper atoms in the solution to grow into copper nanowires. The solution was then cooled to room temperature. After the hydrothermal reaction, the solution was washed 2-5 times with deionized water for 5 minutes each time, and collected by centrifugation at 3500-9000 rpm. It was then washed 2-5 times with n-hexane for 5 minutes each time, and collected by centrifugation at 3500-9000 rpm. Finally, it was washed 2-5 times with isopropanol for 5 minutes each time, and collected by centrifugation at 3500-9000 rpm. The copper nanowires were then dissolved in isopropanol solution for storage. The copper nanowires produced had an average diameter of 60 nm and a length of tens of micrometers.

[0051] Step 2: Preparation of MXene nanosheets:

[0052] Weigh 1-2g of lithium fluoride and 20ml of hydrochloric acid into a 100ml polytetrafluoroethylene reactor and stir for 30min. Slowly add 1g of Ti3AlC2 and continue stirring at 35℃ for 24h. Centrifuge the resulting reaction liquid, discard the supernatant, add deionized water to the precipitate in the centrifuge tube, sonicate for 10-60min, centrifuge again (3500rpm), repeat several times until the pH of the liquid after centrifugation is greater than 6. Collect the precipitate, dilute to 150ml, sonicate for 60min to separate the layers, centrifuge at 3500rpm for 10-30min, and collect the supernatant solution. Freeze-dry the solution and then prepare it to the required concentration. The obtained MXene is Ti3C2T. X The average area is relatively large.

[0053] Step 3: Preparation of Cu NWs-MXene transparent electrode

[0054] The prepared Cu NWs solution was ultrasonicated for 15-60 minutes, then added to a spray gun. A cleaned PET substrate was held with tweezers and dried with nitrogen gas. The distance between the spray gun and the substrate was adjusted, and the copper nanowire solution was sprayed onto the PET substrate for 30-90 seconds. The sprayed Cu NWs transparent electrode was then immersed in glacial acetic acid solution for 5-30 minutes, removed, and dried on a hot table. Next, the prepared MXene solution was placed on a magnetic stirrer at 200-700 rpm, and the Cu NWs transparent electrode was immersed for 30-90 seconds, then removed and dried on a hot table to form a Cu NWs-MXene transparent electrode. Finally, a vacuum drying oven was opened and heated to 170-230℃. The Cu NWs-MXene transparent electrode was placed inside, the vacuum pump was turned on, and the temperature was maintained for 30-60 minutes before removal.

[0055] Example 3

[0056] Based on the above embodiments, this embodiment provides a Cu NWs-MXene composite material for transparent electrodes, prepared using the preparation method described in any one of the above embodiments.

[0057] This invention presents a novel vacuum annealing method for copper nanowires, enabling simple preparation of transparent copper nanowire electrodes and facilitating large-scale production. Compared to previous sintering methods, vacuum annealing only requires a vacuum drying oven, which is simple, easy to operate, and inexpensive. It eliminates the need for the inert gas purging step and does not require overly complex instruments, thus achieving economic efficiency.

[0058] Furthermore, the performance of the Cu NWs-MXene composite material prepared using the preparation method of the present invention will be verified through experiments below.

[0059] Experimental Procedure: First, by testing different film-forming methods, it was determined that the composite transparent film prepared by first spraying copper nanowires and then dipping in MXene nanosheets had better quality. Second, by testing the sheet resistance using a four-probe method, it was concluded that soaking the copper nanowires in glacial acetic acid for 10 minutes before dipping in MXene significantly reduced the sheet resistance of the transparent electrode. Further testing with glacial acetic acid for different soaking times revealed that 10 minutes yielded the best results. The use of glacial acetic acid to treat the copper nanowires is because the carboxyl groups in glacial acetic acid react with the amino groups in the surfactants coating the surface of the copper nanowires. Simultaneously, it reacts with the copper oxide and copper hydroxide adhering to the copper nanowires during synthesis, thereby smoothing the nanowire surface, increasing the effective contact area between the wires, reducing contact resistance, and ultimately lowering the sheet resistance of the copper nanowire transparent electrode.

[0060] Experiments revealed that treating with glacial acetic acid after dipping in MXene nanosheets was less effective than treating directly after spraying in copper nanowires. This is because MXene coating on the copper nanowires hinders the reaction of carboxyl groups with other substances. Testing the prepared transparent electrodes with MXene nanosheet solutions of varying concentrations showed that the optimal concentration was 1 mg / ml. Higher concentrations resulted in a significant decrease in transmittance. Lower concentrations failed to reduce sheet resistance and instead reduced transmittance.

[0061] Furthermore, high-temperature sintering can reduce the sheet resistance of copper nanowire transparent electrodes, while high-temperature annealing can also reduce the performance of MXene transparent electrodes. By testing composite transparent electrodes annealed at different temperatures and times under vacuum, the optimal annealing parameters were finally determined to be between 190-220℃. Experiments showed that the larger the area of ​​the MXene nanosheets, the better the performance of the composite transparent electrode. Therefore, the MXene synthesis method used in this experiment ultimately employed a reagent ratio that yielded the largest average size of the MXene nanosheets.

[0062] Please see Figure 2 , Figure 2 This is an XRD pattern of Cu NWs synthesized by hydrothermal method according to an embodiment of the present invention. As can be seen from the figure, the diffraction peaks of the copper nanowires have 2θ angles of 43.68°, 51.84° and 74.22°, which correspond to the (111), (200) and (220) crystal planes of the copper nanowires, respectively. There are no other diffraction peaks, indicating that the copper nanowires are very pure and have not been oxidized.

[0063] Please see Figure 3 , Figure 3 This is an XRD pattern of in-situ synthesized MXene nanosheets provided in this embodiment of the invention, showing the unetched Ti3AlC2MAX phase and the etched Ti3C2T phase. x The XRD pattern, by Figure 3It can be seen that the 2θ angles of the diffraction peaks of the unetched MAX phase are 9.36°, 18.95°, 33.83°, 35.01°, 35.82°, 36.57°, 38.81°, 41.61°, 44.70°, 48.28°, 52.08°, and 56.20°, respectively, corresponding to the (002), (004), (100), (102), (103), (008), (104), (105), (106), (107), (108), and (109) crystal planes of Ti3AlC2. Meanwhile, the Ti3C2T phase etched with LiF / HCl... x Except for the diffraction peak corresponding to the (002) crystal plane, all other diffraction peaks disappeared. The diffraction peak corresponding to the (002) crystal plane shifted from 9.36° to 7.26°. This phenomenon indicates that the Al element in Ti3AlC2MAX was etched, and the positions originally occupied by Al atoms were vacated, thus changing the elemental composition of Ti3AlC2. Therefore, it can be confirmed that Ti3C2T was obtained after etching. x MXene nanosheets. See also Figure 4 , Figure 4 The thermogravimetric curve of Cu NWs synthesized by hydrothermal method provided in this embodiment of the invention shows that the mass of copper nanowires gradually decreases with increasing temperature. This is also because impurities, residual organic end-capping agents, and surface oxide layers in the copper nanowires are removed with increasing temperature.

[0064] Please see Figure 5 , Figure 5 The image shows a SEM image of the Cu NWs-MXene composite material prepared using the method of this invention. It can be seen that MXene nanosheets cover the blank areas and the spaces between the nanowires in the copper nanowire mesh. The introduction of MXene nanosheets not only fills the non-conductive spaces of the transparent copper nanowire electrode, but also acts as a bridge for electron transport between the nanowires, reducing the contact resistance. At the same time, the MXene nanosheets covering the nanowires can effectively enhance the oxidation resistance of the copper nanowires and the connection between the nanowires and the substrate.

[0065] Please see Figure 6 , Figure 6 This is a graph showing the relationship between sheet resistance and transmittance of the Cu NWs-MXene composite material prepared using the method of this embodiment of the invention. It can be seen that the Cu NWs-MXene composite transparent electrode possesses excellent photoelectric properties: Rs = 33 Ω / sq (550 nm T = 84.7%).

[0066] Please see Figure 7 , Figure 7This is a schematic diagram of the CuNWs-MXene composite material CuNWs-Mxene prepared using the method of this embodiment of the invention. Specifically, copper nanowires are sprayed onto a PET substrate, treated with glacial acetic acid, immersed in an MXene solution to cover the copper nanowire mesh with MXene nanosheets, and then vacuum annealed to successfully prepare the composite material.

[0067] This invention creatively proposes a method for treating copper nanowires with glacial acetic acid followed by vacuum annealing, which simplifies the preparation of transparent copper nanowire electrodes and enables large-scale production. Compared with previous sintering methods, vacuum annealing only requires a vacuum drying oven, which is simple, easy to operate, and inexpensive. It eliminates the need for the inert gas step and does not require overly complex instruments, thus achieving economic efficiency.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing Cu NWs-MXene composite material for transparent electrodes, characterized in that, include: S1: Preparation of copper nanowires; S2: Weigh 1-2.8 mg of lithium fluoride and 20 ml of 9-12 mol / L hydrochloric acid into a 100 ml polytetrafluoroethylene reactor and stir for 10-30 min. Add 1 g of Ti3AlC2 and stir continuously at 25-45℃ for 24 h. Centrifuge the obtained reaction liquid and discard the supernatant. Add deionized water to the precipitate, sonicate and centrifuge, repeating several times until the pH of the liquid after centrifugation is greater than 6. Collect the precipitate and dilute it to 150 ml. Sonicate for 30-90 min to separate the layers, then centrifuge for another 10-30 min and collect the supernatant solution, which is the MXene nanosheet solution. S3: The prepared copper nanowires are sprayed onto the substrate, and the substrate with copper nanowires is immersed in MXene nanosheet solution to form a copper nanowire-MXene transparent electrode. S1 includes: An appropriate amount of CuCl2, glucose and octadecylamine were pre-dissolved in deionized water and stirred thoroughly. The mixture was then placed in a drying oven and heated to carry out a hydrothermal reaction, which allowed copper atoms in the solution to grow into copper nanowires. The mixture was then cooled to room temperature. After the hydrothermal reaction was completed, the solution was washed and centrifuged to obtain copper nanowires, which were then dissolved in isopropanol solution for storage. S3 includes: The prepared copper nanowire solution was taken out and sonicated for 15-60 minutes. It was then added to a spray gun, and the cleaned PET substrate was dried with nitrogen. The distance between the spray gun and the substrate was then adjusted, and the copper nanowire solution was sprayed onto the PET substrate. The sprayed copper nanowire transparent electrode was then immersed in glacial acetic acid solution for 5-30 minutes, and then dried. The prepared MXene nanosheet solution was then placed on a magnetic stirrer at a speed of 200-700 rpm, and the copper nanowire transparent electrode was immersed in it. After a certain period of time, it was removed, dried, and a copper nanowire-MXene transparent electrode was formed. Open the vacuum drying oven and heat it to between 170-230℃. Place the copper nanowire-MXene transparent electrode inside, turn on the vacuum pump, and remove it after vacuum annealing.

2. The method for preparing Cu NWs-MXene composite material for transparent electrodes according to claim 1, characterized in that, The copper nanowires have an average diameter of 60 nm and a length of 10-100 μm.

3. The method for preparing Cu NWs-MXene composite material for transparent electrodes according to claim 2, characterized in that, The MXene nanosheets are Ti3C2T X And the average area is 2-6μm 2 .

4. A Cu NWs-MXene composite material for transparent electrodes, characterized in that, Prepared using the preparation method according to any one of claims 1 to 3.

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