A method for preparing an MXene metal mesh composite electromagnetic shielding film

Abstract

This invention discloses a method for preparing an MXene metal mesh composite electromagnetic shielding film. The method includes the following steps: S1: preparation of a transparent metal mesh; S2: MXene sulfidation treatment; S3: preparation of the MXene metal mesh composite transparent electromagnetic shielding film; S4: post-treatment of the composite electromagnetic shielding film. This invention prepares a transparent copper metal mesh using a photoluminescence subtraction process, and then modifies the metal mesh with MXene. To improve the adhesion of MXene to the copper metal mesh, a slight sulfidation treatment is first performed on the MXene to achieve better adhesion through Cu-S bonds. By combining the metal mesh and MXene, the composite electromagnetic shielding film achieves an upgrade in shielding performance and transparency, solving the defects of existing metal meshes such as numerous defects and high cost of MXene shielding films. This invention provides a new approach for the development of transparent electromagnetic shielding films.

Description

Technical Field

[0001] This invention relates to the technical field of transparent electromagnetic shielding films, specifically a method for preparing an MXene metal mesh composite electromagnetic shielding film. Background Technology

[0002] Electromagnetic shielding films have wide applications in military, information security, and anti-interference fields. With further technological advancements, higher demands are being placed on electromagnetic shielding films, with transparent electromagnetic shielding films representing a crucial development direction. These films are used in areas such as smart windows and displays. Transparent metal mesh is a high-performance electromagnetic shielding film. However, due to the extremely fine circuitry (typically at the micrometer level), localized defects can exist, leading to a certain degree of degradation in its electromagnetic shielding performance. Effectively repairing these defects is of great significance for improving its electromagnetic shielding performance.

[0003] MXene is a novel layered material that exhibits transparent optical properties when used in single-layer or few-layer configurations. Studies have shown that MXene possesses excellent electromagnetic shielding performance; however, using a single layer of MXene for electromagnetic shielding requires a large quantity and significantly reduces transparency. Therefore, by combining MXene with a metal mesh, and using a small amount of single-layer or few-layer MXene to repair defects in the metal mesh, a high-performance transparent electromagnetic shielding film can be obtained. Summary of the Invention

[0004] In order to promote the development of transparent electromagnetic shielding film technology and solve the problems of defects in metal mesh shielding films, high cost and low light transmittance of MXene shielding films, this invention proposes a method for preparing an MXene metal mesh composite transparent electromagnetic shielding film.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing an MXene metal mesh composite electromagnetic shielding film, the method comprising the following steps:

[0006] S1: Transparent metal mesh preparation: The transparent substrate material coated with copper film is placed in a photolithography machine. After exposure, a photolithographic pattern will be formed on the surface of the material. At this time, the photolithographic pattern needs to be developed, etched and stripped. The photolithographic transparent substrate material is taken out and cleaned and dried to form a transparent metal mesh. The transparent substrate material does not need to be removed to ensure the operability of the transparent metal mesh.

[0007] S2: MXene sulfurization treatment. MXene powder is placed in a reactor and a certain amount of sulfur source is added. The reactor is placed in an atmosphere furnace and heated to a certain temperature so that the sulfur source is evenly distributed on the surface of the MXene powder. After the reaction is completed, the MXene powder is taken out and dried.

[0008] S3: Preparation of MXene metal mesh composite transparent electromagnetic shielding film: MXene nanosheets are prepared into a suspension and coated on the surface of a transparent metal mesh to form a composite transparent electromagnetic shielding film.

[0009] S4: Post-treatment of composite electromagnetic shielding film: The composite shielding film is dried. The drying temperature is controlled at 50-90℃. The drying process is protected by either vacuum or inert gas.

[0010] S5: Test and optimize the MXene metal mesh composite transparent electromagnetic shielding film to ensure good electromagnetic shielding performance and stability.

[0011] Preferably, the transparent metal mesh is prepared using a photoluminescence subtraction process, with the linewidth controlled between 2 and 20 micrometers.

[0012] Preferably, the MXene includes, but is not limited to, a slight sulfurization treatment of MXene using a sulfur atmosphere method, with the furnace temperature controlled at 60-300°C.

[0013] Preferably, the mass ratio of MXene to sulfur source is 100:1 to 10000:1, and the sulfur source can be elemental sulfur or decomposable sulfur salt.

[0014] Preferably, the MXene vulcanization treatment uses an inert gas to protect the vulcanization process, and the inert gas is either nitrogen or argon.

[0015] Preferably, the sulfur-containing MXene is prepared as a dispersion with a mass fraction of 1%-20%.

[0016] Preferably, the solvent for the dispersion is one of water, ethanol, or n-hexane.

[0017] Preferably, the MXene metal mesh composite method is selected from either spraying or immersion.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention upgrades the shielding performance and transparency of composite electromagnetic shielding films by combining metal mesh and MXene, solving the defects of existing metal mesh products such as numerous defects and high cost of MXene shielding films. The preparation method of MXene metal mesh composite transparent electromagnetic shielding film provided by this invention offers a new approach for the development of transparent electromagnetic shielding films.

[0020] 2. In this invention, a transparent copper mesh is prepared by a yellow light subtractive process, and then the metal mesh is modified with MXene. In order to improve the adhesion of MXene on the copper mesh, the MXene is first slightly sulfided to achieve better adhesion through Cu-S bonds. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the preparation of the MXene metal mesh composite transparent electromagnetic shielding film of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 1 This invention provides a technical solution: a method for preparing an MXene metal mesh composite electromagnetic shielding film, the method comprising the following steps:

[0024] S1: Preparation of transparent metal mesh: Place the transparent substrate material coated with copper film inside the photoluminescence machine and set the exposure intensity to 1000-1500 W / cm. 2 After exposure, a photolithographic pattern will be formed on the surface of the material. At this time, the photolithographic pattern needs to be developed, etched and stripped. The transparent substrate material after photolithography is taken out and cleaned and dried to form a transparent metal mesh. The transparent substrate material does not need to be removed to ensure the operability of the transparent metal mesh.

[0025] The transparent metal mesh is prepared using a photoluminescence subtraction process, with the linewidth controlled between 2 and 20 micrometers. Surface treatment and anti-oxidation treatment are performed on the surface of the metal mesh to improve its corrosion resistance and oxidation resistance.

[0026] S2: MXene sulfurization treatment. MXene powder is placed in a reactor and a certain amount of sulfur source is added. The reactor is placed in an atmosphere furnace and heated to a certain temperature so that the sulfur source is evenly distributed on the surface of the MXene powder. After the reaction is completed, the MXene powder is taken out and dried.

[0027] MXene includes, but is not limited to, slight sulfurization treatment of MXene using a sulfur atmosphere method. The furnace temperature is controlled at 60-300℃, and the mass ratio of MXene to sulfur source is 100:1 to 10000:1. The sulfur source can be elemental sulfur or decomposable sulfur salts. The MXene sulfurization treatment uses an inert gas to protect the sulfurization process. The inert gas is either nitrogen or argon. The heating temperature for MXene sulfurization treatment is between 100℃ and 300℃.

[0028] S3: Preparation of MXene metal mesh composite transparent electromagnetic shielding film: MXene nanosheets are prepared into a dispersion and coated on the surface of a transparent metal mesh to form a composite transparent electromagnetic shielding film;

[0029] The sulfur-containing MXene is prepared as a dispersion with a mass fraction of 1%-20%. The solvent for the dispersion is water, ethanol or n-hexane. This preparation effectively improves its dispersibility and makes it more uniformly dispersed in the solution. The sulfur-containing MXene metal mesh is composited by spraying or immersion to ensure the compatibility and compositeness of the MXene metal mesh and the transparent substrate material.

[0030] S4: Post-processing of composite electromagnetic shielding film: After the composite electromagnetic shielding film is prepared, it needs to be cleaned and impurities removed. This can be done by using an ultrasonic cleaner or other cleaning tools. After cleaning and removing bubbles and impurities, flatness and surface quality are checked. Then the composite shielding film is dried. The drying temperature is controlled at 50-90℃. The drying process is protected by either vacuum or inert gas.

[0031] S5: Test and optimize the MXene metal mesh composite transparent electromagnetic shielding film to ensure good electromagnetic shielding performance and stability.

[0032] In summary, a transparent copper mesh was prepared using a photoluminescence subtractive process, and then modified with MXene. To improve the adhesion of MXene to the copper mesh, the MXene was first slightly sulfurized to achieve better adhesion through Cu-S bonds. By combining the metal mesh and MXene, the composite electromagnetic shielding film achieved an upgrade in shielding performance and transparency, solving the defects of existing metal meshes such as numerous defects and high cost of MXene shielding films. The method for preparing an MXene metal mesh composite transparent electromagnetic shielding film provided by this invention offers a new approach for the development of transparent electromagnetic shielding films.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a MXene metal mesh composite electromagnetic shielding film, characterized by: The preparation method comprises the following steps: S1: transparent metal grid preparation: place the transparent substrate material plated with copper film in the yellow light machine, after exposure, the material surface will form a photoetching pattern, at this time, the photoetching pattern needs to be developed, etched and treated by membrane removal, take out the transparent substrate material after photoetching, and perform cleaning and drying treatment, form the transparent metal grid, and the transparent substrate material does not need to be removed to ensure the operability of the transparent metal grid; Wherein, the transparent metal grid is prepared by yellow light subtraction process, and the line width is controlled in 2-20 microns; S2: MXene sulfidation treatment, put MXene powder into the reactor, and add a certain amount of sulfur source, put the reactor in the atmosphere furnace, use sulfur atmosphere method to slightly sulfide the MXene powder, control the temperature of the atmosphere furnace at 60-300 DEG C, make the sulfur source uniformly distributed on the surface of the MXene powder, after the reaction is completed, take out the MXene powder, and dry treatment; Wherein, the mass ratio of the MXene powder to the sulfur source is 100:1 to 10000:1, and the sulfur source can be selected from elemental sulfur or decomposable sulfur salt; S3: preparation of MXene metal grid composite transparent electromagnetic shielding film, the product obtained in step S2 is prepared into a dispersion liquid, which is coated on the surface of the transparent metal grid to prepare the composite transparent electromagnetic shielding film; Wherein, the dispersion liquid is prepared as a dispersion liquid with a mass fraction of 1%-20%; The solvent of the dispersion liquid is selected from one of water, ethanol or n-hexane; S4: post-treatment of the composite electromagnetic shielding film, the composite shielding film is dried at a temperature of 50-90 DEG C, and the drying process is protected by one of vacuum or inert gas; S5: test and optimization of the MXene metal grid composite transparent electromagnetic shielding film to ensure good electromagnetic shielding performance and stability.

2. The method for preparing an MXene metal mesh composite electromagnetic shielding film according to claim 1, characterized in that: The MXene sulfidation treatment uses inert gas to protect the sulfidation process, and the inert gas is selected from one of nitrogen and argon.

3. The method for preparing an MXene metal mesh composite electromagnetic shielding film according to claim 1, characterized in that: The MXene metal grid composite method is selected from one of spraying or soaking.

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