Preparation method of high-hydrophilicity silver alloy membrane

Abstract

The invention discloses a preparation method of a high-hydrophilicity silver alloy film. The preparation method comprises the following steps: firstly, preparing an Ag-W alloy film on a substrate through a magnetron sputtering technology; and then the substrate on which the Ag-W alloy film is deposited naturally takes effect, so that self-growth of silver particles on the surface of the Ag-W alloy film can be promoted, and the high-hydrophilicity silver alloy film is obtained. A proper amount of W element is added into pure silver, and then the atomic diffusion behavior of the silver alloy film is naturally and effectively regulated and controlled on a sample, so that silver particles which are uniformly distributed are self-grown on the surface of the Ag-W alloy film, a silver alloy particle film with a large specific surface area is obtained, and the silver alloy film with high hydrophilicity is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of silver alloy films, in particular to a method for preparing a highly hydrophilic silver alloy film. Background Art

[0002] Low-cost nanoscale Ag thin films have become one of the research hotspots in this field due to their broad application prospects in the fields of electronics, catalysis, medical sterilization, and Raman detection. Surfaces with high hydrophilicity in highly hydrophilic materials can enable the directional transfer and fixation of biological molecules, nanoparticles, and bacteria, and this property is of great value for daily life and industrial and medical applications. However, the hydrophilicity of pure silver thin films is poor, and the contact angle with water is usually greater than 80°, which limits the service performance of silver thin films in some applications that require a hydrophilic environment. Therefore, the preparation of highly hydrophilic Ag thin films is of great value.

[0003] At present, the preparation of highly hydrophilic Ag thin films usually adopts sol-gel, electrochemical, redox, sputtering and other methods to introduce silver thin films on the surface of the substrate. For example, patent 201010207754.6 (a method for preparing antibacterial fabrics loaded with nano-silver by impregnation process) modifies the surface of textiles such as clothes with dopamine, and then immerses them in silver nitrate solution to obtain antibacterial fabrics with silver nanoparticles grown on the surface. Patents CN101724841 and WO2008 / 049108A1 deposit a dopamine polymerization layer on the surface of polyimide (PI), and then silver-plating the surface to form a continuous silver thin film to obtain good conductive properties. Although the above patents introduce the preparation method of silver thin film or silver particles, they do not mention how to improve the hydrophilicity of the silver thin film.

[0004] At the same time, relevant studies have shown that the key to preparing highly hydrophilic surfaces is to control the microstructure and surface chemical composition of the material surface. However, due to the limitations of the preparation method, the mechanical strength of the material surface microstructure, etc., the preparation of highly hydrophilic Ag films still lacks a simple, economical and environmentally friendly preparation method. The existing methods require the use of expensive instruments and equipment or complex process flows, making it difficult to prepare highly hydrophilic Ag films at low cost and conveniently.

[0005] Therefore, it is urgent to develop a simple, feasible, environmentally friendly and economical preparation method for highly hydrophilic silver alloy thin films. In particular, new preparation methods that do not require special equipment, are environmentally friendly, and are easy to achieve industrial production will greatly promote the application and development of silver alloy films. Summary of the invention

[0006] In order to address the deficiencies in the prior art, the present invention provides a method for preparing a highly hydrophilic silver alloy film, by adding an appropriate amount of W element to pure silver, and then naturally and effectively regulating the atomic diffusion behavior of the silver alloy film on the sample, thereby promoting the self-growth of evenly distributed silver particles on the surface of the Ag-W alloy film, obtaining a silver alloy particle film with a large specific surface area, and preparing a highly hydrophilic silver alloy film.

[0007] In order to achieve the above object, the specific scheme adopted by the present invention is: A method for preparing a highly hydrophilic silver alloy film mainly comprises the following steps: Step S1, preparing an Ag-W alloy thin film on a substrate by magnetron sputtering technology; Step S2, subjecting the substrate with the Ag-W alloy film deposited thereon to natural curing, thereby promoting the self-growth of silver particles on the surface of the Ag-W alloy film, thereby obtaining a highly hydrophilic silver alloy film.

[0008] Furthermore, in step S1, the atomic percentage of W in the Ag-W alloy film is 53-76%. The function of W is to change the structure of the alloy film and promote the diffusion of atoms in the alloy film to the surface of the film to form Ag particles.

[0009] Furthermore, in step S1, the thickness of the silver alloy film is 6-30 nm.

[0010] Furthermore, in step S1, the substrate is made of glass.

[0011] Furthermore, in step S2, the natural effective time is 1-7 days.

[0012] Beneficial effects: (1) The present invention alloys pure silver on a glass substrate and performs an aging treatment, thereby regulating the atomic diffusion behavior of the silver alloy film, promoting the self-growth of evenly distributed Ag particles on the surface of the Ag alloy film, obtaining a silver alloy particle film with a large specific surface area, and preparing a highly hydrophilic silver alloy film.

[0013] (2) The method of the present invention is simple, easy to operate, low in cost, and environmentally friendly. It can effectively regulate the surface microstructure of the Ag alloy film and prepare a highly hydrophilic silver alloy film. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a contact angle comparison diagram between comparative example 1 and embodiment 1.

[0015] Figure 2 It is a comparison diagram of the contact angles of Comparative Example 2 and Example 2.

[0016] Figure 3 This is a comparison diagram of the contact angles of Comparative Example 3 and Example 3. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] The present invention provides a method for preparing a highly hydrophilic silver alloy film, which mainly comprises the following steps: Step S1, preparing Ag-W alloy films with different compositions and thicknesses on a substrate by magnetron sputtering technology; Step S2, the substrate with the Ag-W alloy film deposited thereon is naturally cured for 1-7 days, and the self-growth of silver particles on the surface of the Ag-W alloy film can be promoted by regulating the atomic diffusion behavior on the surface of the alloy film, so as to obtain a silver alloy particle film with a large specific surface area and prepare a highly hydrophilic silver alloy film. Since a large number of nano silver particles are self-formed on the surface of the alloy film, the silver particles make the surface of the film rough, thereby improving the hydrophilicity of the silver alloy film.

[0019] It should be noted that the atomic percentage of W in the Ag-W alloy film is 53-76%, and the thickness of the Ag-W alloy film is 6-30 nm.

[0020] The technical solution of the present invention is further described below in conjunction with the following specific embodiments.

[0021] Example 1 A method for preparing a highly hydrophilic silver alloy film mainly comprises the following steps: Step S1, preparing a 6 nm thick Ag-53% W alloy film on a glass substrate (substrate size is 20 mm in length, 20 mm in width, and substrate thickness is 0.5 mm) by a magnetron sputtering method; Step S2: Allow the substrate on which the Ag-53%W alloy film is deposited to cure naturally for 1 day to prepare a highly hydrophilic silver alloy film.

[0022] Example 2 A method for preparing a highly hydrophilic silver alloy film mainly comprises the following steps: Step S1, preparing a 20 nm thick Ag-65% W alloy film on a glass substrate (substrate size is 20 mm in length, 20 mm in width, and substrate thickness is 0.5 mm) by a magnetron sputtering method; Step S2: Allow the substrate with the Ag-65%W alloy film to cure naturally for 3 days to prepare a highly hydrophilic silver alloy film.

[0023] Example 3 A method for preparing a highly hydrophilic silver alloy film mainly comprises the following steps: Step S1, preparing a 30 nm thick Ag-76% W alloy film on a glass substrate (substrate size is 20 mm in length, 20 mm in width, and substrate thickness is 0.5 mm) by magnetron sputtering method; Step S2: Allow the substrate on which the Ag-76%W alloy film is deposited to cure naturally for 7 days to prepare a highly hydrophilic silver alloy film.

[0024] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that: (1) in step S1, a 6 nm thick pure Ag film is prepared on a glass substrate; (2) step S2 is not included.

[0025] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that: (1) in step S1, a 20 nm thick pure Ag film is prepared on a glass substrate; (2) step S2 is not included.

[0026] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that: (1) in step S1, a 30 nm thick pure Ag film is prepared on a glass substrate; (2) step S2 is not included.

[0027] The contact angle test was performed on the products obtained in Examples 1-3 and Comparative Examples 1-3. The results show that the contact angle of the product obtained in Comparative Example 1 with water is 83.37°, while the contact angle of the product prepared in Example 1 with water is only 7.16°, and the contact angle is reduced by 76.21°. The contact angle of the product obtained in Comparative Example 2 with water is 90.19°, while the contact angle of the product prepared in Example 2 with water is only 15.37°, and the contact angle is reduced by 74.82°. The contact angle of the product obtained in Comparative Example 3 with water is 96.86°, while the contact angle of the product prepared in Example 3 with water is only 22.89°, and the contact angle is reduced by 73.97°. Therefore, the silver alloy film prepared in this example significantly improves the hydrophilicity of the film, and a highly hydrophilic silver alloy film is prepared.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any equivalent changes or modifications made according to the essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a highly hydrophilic silver alloy film, characterized in that: The main steps are as follows: Step S1, preparing an Ag-W alloy thin film on a substrate by magnetron sputtering technology; Step S2, subjecting the substrate with the Ag-W alloy film deposited thereon to natural curing, thereby promoting the self-growth of silver particles on the surface of the Ag-W alloy film, thereby obtaining a highly hydrophilic silver alloy film.

2. The method for preparing a highly hydrophilic silver alloy film according to claim 1, characterized in that: In step S1, the atomic percentage of W in the Ag-W alloy film is 53-76%.

3. The method for preparing a highly hydrophilic silver alloy film according to claim 1, characterized in that: In step S1, the thickness of the Ag-W alloy film is 6-30 nm.

4. The method for preparing a highly hydrophilic silver alloy film according to claim 1, characterized in that: In step S1, the substrate is made of glass.

5. The method for preparing a highly hydrophilic silver alloy film according to claim 1, characterized in that: In step S2, the natural effective time is 1-7 days.

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