High-antibacterial-activity Ag nano island / metal substrate and preparation method thereof

Abstract

The invention provides a high-antibacterial-activity Ag nano island / metal substrate and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out magnetron sputtering on the surface of the metal substrate to form a layer of Ag-Nb alloy film; then the metal substrate sputtered with the Ag-Nb alloy film is placed in warm water at the temperature of 50 DEG C to be soaked for 1-7 days, so that an Ag nano island grows on the surface of the Ag-Nb alloy film; and after soaking is completed, the substrate is taken out and dried, and the high-antibacterial-activity Ag nano island / metal substrate is obtained. The Ag-Nb alloy film is deposited on the surface of the metal substrate through the magnetron sputtering technology, then the silver nano island with efficient bacteriostasis is self-grown on the surface of the metal substrate through warm water soaking, and the bacteriostasis and antibiosis capacity of the silver nano island is improved.

Description

Technical Field

[0001] The invention relates to the technical field of Ag nano-islands / metal substrates, in particular to a highly antibacterial Ag nano-islands / metal substrate and a preparation method thereof. Background Art

[0002] Due to its broad application prospects in the fields of electronics, catalysis, medical sterilization, Raman detection, etc., low-cost nanoscale Ag thin films, silver particles and their composite materials preparation technology has become one of the research hotspots in this field. Studies have found that as the thickness of thin film materials decreases to the nanoscale, under the action of thermal fields, electric fields and stress fields, irregular hillocks or particles are prone to appear on the surface of the film, which seriously damages the service life and service safety of thin film devices.

[0003] Metal substrates (such as stainless steel sheets, copper sheets, etc.) are often used in medical examinations, such as stainless steel sheets used to collect signals on the surface of the clips that clamp the wrists / ankles during electrocardiogram tests. During physical examinations and treatments in hospitals, these stainless steel sheets directly contact the skin of different examinees. A large number of people undergo electrocardiogram tests every day. During the test, the skin of the tested person will contact the steel sheet surface on the plastic clip in many places, posing a risk of bacterial cross-infection.

[0004] Based on this, it is necessary to design a method to improve the antibacterial and antimicrobial properties of the metal substrate surface. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a highly antibacterial Ag nano-island / metal substrate and a preparation method thereof. The present invention deposits an Ag-Nb alloy film on the surface of a metal substrate by magnetron sputtering technology, and then self-grows highly antibacterial silver nano-islands on the surface of the metal substrate by immersing it in warm water, thereby improving its antibacterial and antibacterial capabilities.

[0006] In order to achieve the above object, the specific scheme adopted by the present invention is: On the one hand, the present invention discloses a method for preparing a highly antibacterial Ag nano-island / metal substrate, which mainly comprises the following steps: (1) magnetron sputtering a layer of Ag-Nb alloy film on the surface of the metal substrate; (2) Soak the metal substrate sputtered with the Ag-Nb alloy film in warm water at 50°C for 1-7 days, so that Ag nano-islands grow on the surface of the Ag-Nb alloy film; (3) After soaking, take out and dry to obtain highly antibacterial Ag nano-islands / metal substrate.

[0007] Furthermore, the metal substrate is made of stainless steel or copper.

[0008] Furthermore, in step (1), the thickness of the Ag-Nb alloy film is 50-150 nm.

[0009] Furthermore, the size of the Ag nano-islands is 20~160nm.

[0010] Furthermore, in step (3), the specific method of the drying treatment is: placing in a drying oven at a temperature of 30° C. and drying for 24 hours.

[0011] Furthermore, the Ag-Nb alloy film contains 50% Nb, and the function of Nb is to promote the diffusion of atoms in the alloy film to the surface of the film to form Ag particles.

[0012] On the other hand, the present invention discloses a highly antibacterial Ag nano-island / metal substrate, which is prepared by the above method.

[0013] Beneficial effects: (1) The present invention regulates the stress release behavior and atomic diffusion behavior of the silver alloy film by immersing the Ag-Nb alloy film on the metal substrate in warm water. The warm water environment can promote the release of residual stress in the alloy film, increase the diffusion rate of Ag atoms, and promote the self-growth of dense nano-islands on the surface of the Ag-Nb alloy film, thereby increasing the specific surface area of ​​the alloy film and improving the antibacterial performance of the nano-islands / metal substrate.

[0014] (2) The method of the present invention is simple, easy to operate, low in cost, and environmentally friendly. It can effectively regulate the growth of silver particle nano-islands on the surface of the Ag-Nb alloy film on the metal substrate, and obtain a more uniform structure and highly effective antibacterial Ag nano-island / alloy film / metal substrate, which is expected to be applied in scenes requiring antibacterial properties such as electrocardiogram detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a preparation flow chart of the present invention.

[0016] Figure 2 This is the SEM image of the Ag nano-island side in the Ag nano-island / metal substrate prepared in Example 1.

[0017] Figure 3 This is the SEM image of the Ag nano-island side in the Ag nano-island / metal substrate prepared in Example 2.

[0018] Figure 4 This is the SEM image of the Ag nano-island side in the Ag nano-island / metal substrate prepared in Example 3.

[0019] Figure 5 This is the SEM image of the alloy film side in the alloy film / metal substrate prepared in Comparative Example 1. DETAILED DESCRIPTION

[0020] 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.

[0021] The present invention provides a highly antibacterial Ag nano-island / metal substrate and a preparation method thereof, please refer to Figure 1 The preparation method is as follows: first, a 50-150nm thick Ag-Nb alloy film is deposited on the surface of a metal substrate using magnetron sputtering technology, and then the Ag-Nb alloy film / metal substrate composite sample is immersed in 50°C warm water for 1-7 days. After the immersion is completed, the sample is taken out and dried.

[0022] The technical solution of the present invention is further described below in conjunction with the following specific embodiments.

[0023] Example 1 This embodiment provides a method for preparing a highly antibacterial Ag nano-island / metal substrate, which mainly comprises the following steps: (1) depositing a 50 nm thick Ag-Nb alloy film on the surface of a stainless steel substrate (substrate size is 40 mm long, 30 mm wide, and substrate thickness is 0.5 mm) by magnetron sputtering technology; (2) Soak the Ag-Nb alloy film / stainless steel substrate composite sample in 50°C warm water for 1 day. The soaking process can accelerate the stress release rate and increase the atomic diffusion distance, thereby promoting the self-growth of Ag nano-islands on the alloy film surface; (3) After soaking, take out the sample, put it in a dry glass culture dish, and then place it in a drying oven at 30°C for 1 day before putting it into use.

[0024] Example 2 This embodiment provides a method for preparing a highly antibacterial Ag nano-island / metal substrate, which mainly comprises the following steps: (1) depositing a 100 nm thick Ag-Nb alloy film on the surface of a stainless steel substrate (substrate size is 40 mm long, 30 mm wide, and substrate thickness is 0.5 mm) by magnetron sputtering technology; (2) Soak the Ag-Nb alloy film / stainless steel substrate composite sample in 50°C warm water for 3 days. The soaking process can accelerate stress release, promote atomic diffusion, and promote the self-formation of dense Ag nano-islands on the surface of the Ag-Nb alloy film. (3) After soaking, take out the sample, put it in a dry glass culture dish, and then place it in a drying oven at 30°C for 1 day before putting it into use.

[0025] Example 3 This embodiment provides a method for preparing a highly antibacterial Ag nano-island / metal substrate, which mainly comprises the following steps: (1) depositing a 150 nm thick Ag-Nb alloy film on the surface of a stainless steel substrate (substrate size is 40 mm long, 30 mm wide, and substrate thickness is 0.5 mm) by magnetron sputtering technology; (2) Soak the Ag-Nb alloy film / stainless steel substrate composite sample in 50°C warm water for 7 days. The soaking process can accelerate stress release, promote atomic diffusion, and promote the self-formation of dense Ag nano-islands on the surface of the Ag-Nb alloy film. (3) After soaking, take out the sample, put it in a dry glass culture dish, and then place it in a drying oven at 30°C for 1 day before putting it into use.

[0026] Comparative Example 1 The only difference between Comparative Example 1 and Example 1 is that step (2) is not included.

[0027] right Figures 2 to 5 The results showed that compared with the un-immersed sample (Comparative Example 1), the number of silver nano-islands formed per unit area (1mm*1mm) of the sample increased by about 350% after immersion for 1 day (Example 1), and the average particle size increased by about 260%. After immersion for 3 days (Example 2), the number of silver nano-islands formed per unit area of ​​the sample increased by about 380%, and the average particle size increased by 315%. After immersion for 7 days (Example 3), the number of silver nano-islands formed per unit area of ​​the sample increased by about 420%, and the average particle size increased by 305%. It can be seen that warm water immersion can achieve the effect of promoting the growth of silver nano-islands on the surface of the silver alloy film.

[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 highly antibacterial Ag nano-islands / metal substrates, characterized in that: The main steps are as follows: (1) magnetron sputtering a layer of Ag-Nb alloy film on the surface of the metal substrate; (2) Soak the metal substrate sputtered with the Ag-Nb alloy film in warm water at 50°C for 1-7 days, so that Ag nano-islands grow on the surface of the Ag-Nb alloy film; (3) After soaking, take out and dry to obtain highly antibacterial Ag nano-islands / metal substrate.

2. The method for preparing a highly antibacterial Ag nano-island / metal substrate according to claim 1, characterized in that: The material of the metal substrate is stainless steel or copper.

3. The method for preparing a highly antibacterial Ag nano-island / metal substrate according to claim 1, characterized in that: In step (1), the thickness of the Ag-Nb alloy film is 50-150 nm.

4. The method for preparing a highly antibacterial Ag nano-island / metal substrate according to claim 1, characterized in that: The size of the Ag nanoislands ranges from 20 to 160 nm.

5. The method for preparing a highly antibacterial Ag nano-island / metal substrate according to claim 1, characterized in that: In step (3), the specific method of the drying treatment is: placing in a drying oven at a temperature of 30° C. and drying for 24 hours.

6. The method for preparing a highly antibacterial Ag nano-island / metal substrate according to claim 1, characterized in that: The Ag-Nb alloy film contains 50% Nb.

7. A highly antibacterial Ag nano-island / metal substrate, characterized in that: The method is prepared by the method described in any one of claims 1 to 6.

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