Preparation method of antibacterial conductive copper nanoparticles, copper nanoparticles and application

Abstract

The invention discloses a preparation method of antibacterial conductive copper nanoparticles, the copper nanoparticles and application. The method comprises the following steps: 1) adding copper sulfate pentahydrate and polyvinylpyrrolidone into ultrapure water to obtain a precursor solution; 2) heating the precursor solution to 75-95 DEG C, adding an ascorbic acid solution and dimethylethanolamine, carrying out a stirring reaction at 75-95 DEG C, and carrying out a heat preservation reaction at 60-80 DEG C to obtain a first solution; 3) filtering, washing, drying and sintering the first solution at low temperature to obtain copper nanoparticles; the copper nanoparticles are used for preparing antibacterial agents, flexible antibacterial materials or flexible sensors. The method is simple and easy to operate, operation is easy, technological parameters are easy to control, raw materials are easy to obtain, environment friendliness is achieved, performance is stable, and the obtained copper nanoparticles have good high temperature resistance, antibacterial property, conductivity and sensing performance and better meet the requirements of the modern chemical industry for environmental protection and sustainable development.

Description

Technical Field

[0001] The invention relates to the fields of nano material science and material engineering, and in particular to a method for preparing antibacterial conductive copper nanoparticles. Background Art

[0002] Copper nanoparticles have attracted extensive attention from researchers due to their excellent electrical and thermal conductivity, antibacterial and catalytic activity. The synthesis methods of copper nanoparticles mainly include: liquid phase reduction method, microemulsion method, electrochemical reduction method, etc.

[0003] Liquid phase reduction is the most commonly used method for synthesizing copper nanoparticles. Li et al. synthesized copper nanoparticles with good dispersibility and smaller size under the combined action of polyvinyl pyrrolidone (PVP) and hexamethylammonium bromide (CTAB). However, when PVP or CTAB is used alone as a dispersant, there is a problem of uneven particle size.

[0004] The microemulsion method refers to a method in which two incompatible reactants form a relatively uniform microemulsion system under the action of a surfactant, and nanopowder particles are precipitated from the microemulsion. Commonly used surfactants in the microemulsion method include hexadecyltrimethylammonium bromide, stearic acid, dioctyl succinate sulfonic acid (AOT), polyoxyethylene Z, olefins, etc. Dong Chun's method uses copper sulfate as the copper source, hydrazine hydrate as the reducing agent, and gum arabic (GA) as the protective agent without introducing any protective gas to obtain a monodispersed nano copper sol. However, the preparation cost of this method is relatively high.

[0005] Preparation of copper nanoparticles by electrochemical method After applying voltage or current to the electrode surface, the metal ions (in this case, copper ions Cu2+) accept electrons at the cathode (negative electrode) and a reduction reaction occurs. In this process, the copper ions Cu2+ are reduced to copper atoms Cu, which then begin to gather on the electrode surface and form nanoscale copper particles through self-assembly and nuclear growth. The electrochemical method can directly use electrical energy for redox reactions without the need for additional reducing agents or catalysts. However, there are problems such as high cost, production restrictions, and high technical requirements.

[0006] In addition, in the process of copper nanoparticles, commonly used chemical reducing agents, such as sodium borohydride, hydrazine, etc., have certain environmental hazards, and in order to prevent them from causing damage to the environment and human health, they need to be used and handled under strict safety measures. The operating and reaction conditions are strict and do not meet the requirements of the modern chemical industry for environmental protection and sustainable development.

[0007] Therefore, developing a green synthesis process for copper nanoparticles is of great significance for reducing environmental pollution, improving the safety of the preparation process, and improving the application performance of copper nanoparticles. Summary of the invention

[0008] In order to overcome the deficiencies of the prior art, the present invention provides a method for preparing antibacterial conductive copper nanoparticles, copper nanoparticles and applications.

[0009] The present invention adopts the following technical solution:

[0010] (I) A method for preparing antibacterial conductive copper nanoparticles

[0011] The preparation method comprises the following steps:

[0012] 1) Preparation of a precursor solution: adding copper sulfate pentahydrate and polyvinyl pyrrolidone to ultrapure water to obtain a precursor solution;

[0013] In the precursor solution obtained in step 1), the molar concentration of copper sulfate pentahydrate is 0.1-0.2 mol / L, and the mass fraction of polyvinyl pyrrolidone is 0.49-0.8 wt %;

[0014] In the step 1), the molecular weight of the polyvinyl pyrrolidone is 1,300,000 to 3,000,000;

[0015] In the step 1), the molecular weight of the polyvinyl pyrrolidone is preferably 3,000,000.

[0016] 2) Synthesis and collection of copper nanoparticles: After heating the precursor solution obtained in step 1), ascorbic acid (i.e., vitamin C) solution and dimethylethanolamine (DMEA) are added in sequence at a first reaction temperature, stirred for a period of time at the first reaction temperature, and then kept warm for a period of time at a second reaction temperature to obtain a first solution; in step 2), the concentration of the ascorbic acid solution is 1-2 mol / L, and the solvent is water; the volume ratio of the precursor solution, the ascorbic acid solution and the dimethylethanolamine is 50:10:0.3-0.6.

[0017] The step 2) specifically comprises the following steps:

[0018] 2.1) heating the precursor solution to a first reaction temperature, adding ascorbic acid solution dropwise to the precursor solution under stirring at the first reaction temperature, and then adding dimethylethanolamine, stirring at the first reaction temperature for 1 to 2 hours to obtain an intermediate solution; the first reaction temperature is 75 to 95° C.; in the step 2.1), the stirring rate is 400 to 600 rpm;

[0019] 2.2) The intermediate solution obtained in step 2.1) is transferred to a hydrothermal reactor, and kept warm at a second reaction temperature under vacuum for 4 to 8 hours to obtain a first solution; the second reaction temperature is 60 to 80°C.

[0020] 3) Removal of the organic template: Filter the first solution obtained in step 2) to obtain a precipitate, wash the precipitate with water, dry it, and sinter it at low temperature to obtain copper nanoparticles. Step 3) specifically includes the following steps:

[0021] 3.1) Filtering the first solution, taking out the precipitate, washing the precipitate with deionized water and drying it to obtain a dried precipitate; the drying temperature is 80-100° C.;

[0022] 3.2) The dried precipitate obtained in step 3.1) is transferred to a muffle furnace for low-temperature sintering, and copper nanoparticles are obtained after cooling; the low-temperature sintering conditions are: heating from room temperature to 320-400° C. at a heating rate of 2-4° C. / min, and then calcining at a temperature of 320-400° C. for 5-12 hours.

[0023] (II) Copper Nanoparticles

[0024] The copper nanoparticles are in the shape of cubes, and have an average particle size of 80 to 115 nm.

[0025] (III) Application of copper nanoparticles

[0026] The copper nanoparticles are used for preparing antibacterial agents, antibacterial materials or flexible sensors.

[0027] Among them, the flexible sensor includes a resistive sensor, a capacitive sensor, a piezomagnetic sensor, an inductive sensor, etc.

[0028] The present invention has the following beneficial effects:

[0029] 1. The method of the present invention uses copper sulfate pentahydrate as a copper source, ascorbic acid as a reducing agent, and polyvinyl pyrrolidone as a protective agent, and combines an oxidation-reduction method and a low-temperature sintering process to prepare copper nanoparticles. The method of the present invention is simple and easy to operate, and the process parameters are easy to control.

[0030] 2. The copper nanoparticles prepared by the method of the present invention have an average diameter of 98 nm and have good high temperature resistance, antibacterial properties, electrical conductivity and sensing properties, providing high-quality raw materials for the application of nano-copper in the fields of antibacterial agents, flexible sensors, etc.

[0031] 3. The raw materials of the present invention are all green and environmentally friendly materials, which have the advantages of being easy to obtain, environmentally friendly, and having stable performance, and are more in line with the requirements of the modern chemical industry for environmental protection and sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a field emission scanning electron microscope image of the copper particles prepared in Comparative Example 1 of the present invention;

[0033] Figure 2is a field emission scanning electron microscope image of the copper particles prepared in Comparative Example 2 of the present invention;

[0034] Figure 3 is a particle size distribution diagram of copper particles prepared in Comparative Example 2 of the present invention;

[0035] Figure 4 is a field emission scanning electron microscope image of the copper nanoparticles prepared in Example 1 of the present invention;

[0036] Figure 5 is a particle size distribution diagram of copper nanoparticles prepared in Example 1 of the present invention;

[0037] Figure 6 is a graph showing the antibacterial activity of the copper nanoparticles prepared in Example 1 of the present invention against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli);

[0038] Figure 7 is a graph of the tensile response time of a composite hydrogel prepared using the copper nanoparticles prepared in Example 1 of the present invention;

[0039] Figure 8 The conductivity graphs of the composite hydrogel prepared by using the copper nanoparticles prepared by Example 1, Comparative Example 1 and Comparative Example 2 of the present invention and 10% pure PVA hydrogel;

[0040] Fig. 9 is a tensile response time diagram of a composite hydrogel prepared using the copper nanoparticles prepared in Comparative Example 1 of the present invention;

[0041] Fig.10 It is a tensile response time diagram of the composite hydrogel prepared using the copper nanoparticles prepared in Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings and examples, but the implementation manner of the present invention is not limited to this scope.

[0043] The method of the present invention uses copper sulfate pentahydrate (CuSO4·5H2O) as a copper source, ascorbic acid as a reducing agent, polyvinyl pyrrolidone (PVP) as a protective agent, combines an oxidation-reduction method with a low-temperature sintering process, and controls the sintering temperature and time to prepare copper nanoparticles with an average diameter of 98 nanometers. The copper nanoparticles prepared by the method of the present invention are cubic particles in the nanoscale, and the diameter is distributed between 80 nanometers and 115 nanometers.

[0044] Among them, polyvinyl pyrrolidone as a protective agent can promote the reaction and reduce the deposition rate, so as to be evenly coated on the surface of copper nanoparticles to form a passivation layer on the surface of copper nanoparticles, which can effectively prevent the oxidation and agglomeration of copper nanoparticles, so that the generated copper nanoparticles are monodisperse.

[0045] Among them, copper sulfate pentahydrate as a copper source has the advantages of high purity, easy solubility in solvents, high reaction activity, low cost and environmental protection.

[0046] Among them, the reducing agent ascorbic acid is a green and environmentally friendly reducing agent, which is more in line with the requirements of modern chemical industry for environmental protection and sustainable development.

[0047] Among them, the low-temperature sintering method is to ensure the good sintering performance of copper nanoparticles. PVP is evenly coated on the surface of copper nanoparticles, which can be decomposed at low temperature during the subsequent sintering process. After decomposition, the copper nanoparticles with high surface energy are exposed, and the particles are in direct contact with each other. The huge surface energy becomes the driving force for low-temperature sintering, realizing low-temperature sintering between particles. The low-temperature sintering method not only makes the size of copper nanoparticles reach the nanometer level, but also makes the shape and size distribution of copper nanoparticles more uniform.

[0048] The specific steps of the method for preparing copper nanoparticles in the present invention are:

[0049] 1) Preparation of precursor solution: At room temperature, a certain amount of copper sulfate pentahydrate is dissolved in 50 ml of ultrapure water, and stirred continuously until completely dissolved to obtain a copper sulfate pentahydrate solution with a concentration of 0.1 to 0.2 mol / L. Then, a certain amount of PVP (molecular weight 1300000 to 3000000) is added to the copper sulfate pentahydrate solution, and stirred thoroughly until completely dissolved to obtain a precursor solution, wherein the mass of PVP is 0.49 to 0.8% of the total mass of the precursor solution.

[0050] 2) Synthesis and collection of copper nanoparticles: Ascorbic acid was dissolved in 10 ml of ultrapure water at room temperature to prepare an ascorbic acid solution with a concentration of 1 to 2 mol / L. The precursor solution was heated to 75 to 95°C and maintained within this temperature range, and then the ascorbic acid solution was slowly added to the precursor solution, and then 0.3 to 0.6 mL of dimethylethanolamine (DMEA) was added to the precursor solution to obtain a mixed solution;

[0051] Next, stirring the mixed solution at 75 to 95° C. for 1 to 2 hours to obtain a stirred mixed solution;

[0052] The stirred mixed solution is then transferred into a hydrothermal reaction kettle and kept warm at 60-80° C. for 4-8 hours to obtain a first solution.

[0053] 3) Removal of the template: Filter the first solution to obtain a precipitate, wash the precipitate with deionized water, and dry it at 80-100° C. to obtain a dried precipitate;

[0054] The dried precipitate is transferred to a muffle furnace for low-temperature sintering. The conditions for the low-temperature sintering are: heating from room temperature to 320-400°C at a heating rate of 2-4°C / min, calcining at 320-400°C for 5-12 hours, and cooling after low-temperature sintering to obtain copper nanoparticles.

[0055] The copper nanoparticles prepared by the method of the invention have excellent antibacterial performance, and the antibacterial rate to Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) reaches more than 99%.

[0056] The copper nanoparticles prepared by the method of the present invention also have excellent conductivity and sensing performance. The copper nanoparticles are compounded with a hydrogel based on polyvinyl alcohol (PVA) to prepare a composite hydrogel with good sensing performance. The response time under a tensile strain of 2% is 206.8ms and the loading and unloading processes of the composite hydrogel show a fast response of 232.8ms respectively.

[0057] The specific embodiments and comparative examples of the present invention are as follows:

[0058] Comparative Example 1

[0059] In this embodiment, PVP with a relatively low molecular weight is used to prepare copper particles that have not been sintered at a low temperature. The specific steps are as follows:

[0060] 1) At room temperature, 0.79 g of copper sulfate pentahydrate was dissolved in 50 mL of ultrapure water and stirred continuously until completely dissolved. Then, 0.25 g of PVP with a molecular weight of 8000 was added to the above solution and stirred thoroughly until completely dissolved to obtain a precursor solution;

[0061] 2) Dissolve 1.76 g of ascorbic acid in 10 ml of ultrapure water. Heat the precursor solution to 75°C and maintain it, then slowly drop the ascorbic acid solution into the precursor solution, then add 0.3 ml of DMEA to the above solution, stir at 75°C for 1 hour to obtain a stirred mixed solution. Move the stirred mixed solution into a hydrothermal reactor and keep it warm at 60°C for 4 hours to obtain a first solution;

[0062] 3) The first solution is filtered, washed with deionized water, and then dried at 80° C. to obtain copper particles.

[0063] The field emission scanning electron microscope image of the copper particles prepared in this comparative example is as follows Figure 1 As shown, it can be clearly seen that the copper particles prepared by low molecular weight PVP have a rough surface, a large particle size, and an uneven particle size distribution.

[0064] Comparative Example 2

[0065] In this comparative example, high molecular weight PVP (molecular weight of 3,000,000) is used to prepare copper nanoparticles that have not been sintered at low temperature, and the remaining steps are the same as those in comparative example 1. The specific steps include:

[0066] 1) Dissolve 0.79 g of copper sulfate pentahydrate in 50 ml of ultrapure water at room temperature and continue stirring until completely dissolved. Then, add 0.25 g of PVP with a molecular weight of 3,000,000 to the above solution and stir thoroughly until completely dissolved to obtain a precursor solution;

[0067] 2) Dissolve 1.76 g of ascorbic acid in 10 ml of ultrapure water. Heat the copper sulfate pentahydrate solution to 75°C and maintain it, then slowly drop the ascorbic acid solution, add 0.3 ml of DMEA to the above solution, and stir at 75°C for 1 hour to obtain a stirred mixed solution. Move the stirred mixed solution into a hydrothermal reactor and keep it at 60°C for 4 hours to obtain a first solution;

[0068] 3) The first solution is filtered, washed with deionized water, and then dried at 80° C. to obtain copper nanoparticles.

[0069] The field emission scanning electron microscope image of the copper particles prepared in this comparative example is as follows Figure 2 As shown, it can be clearly seen that the surface of the copper particles prepared by high molecular weight PVP is relatively smooth.

[0070] The particle size distribution of the copper particles prepared in this comparative example is as follows: Figure 3 As shown, the average particle size of the copper particles prepared in this comparative example is 3.76 μm, which fails to reach the nanometer level, and the particle size distribution of the copper particles is between 1 and 8 μm. The particle size distribution is more uniform than that of the copper particles prepared in comparative example 1.

[0071] Example 1

[0072] In this embodiment, the copper nanoparticles prepared in Comparative Example 2 are subjected to low-temperature sintering in a muffle furnace to obtain copper nanoparticles. The preparation process of this embodiment is specifically as follows:

[0073] 1) Dissolve 0.79 g of copper sulfate pentahydrate in 50 ml of ultrapure water at room temperature and continue stirring until completely dissolved. Then, add 0.25 g of PVP (molecular weight 3,000,000) to the above solution and stir thoroughly until completely dissolved to obtain a precursor solution;

[0074] 2) Dissolve 1.76 g of ascorbic acid in 10 ml of ultrapure water. Heat the precursor solution to 75°C and maintain it, then slowly drop the ascorbic acid solution, add 0.3 ml of DMEA to the above solution, and stir at 75°C for 1 hour to obtain a stirred mixed solution. Move the stirred mixed solution into a hydrothermal reactor and keep it at 60°C for 4 hours to obtain a first solution;

[0075] 3) The first solution is filtered, washed with deionized water, and dried at 80°C to obtain a dried precipitate. The dried precipitate is sintered at a low temperature in a muffle furnace, and the low temperature sintering conditions are: heating from room temperature to 400°C at a heating rate of 2°C / min, and calcining at 400°C for 6 hours to obtain copper nanoparticles.

[0076] The field emission scanning electron microscopy image of the copper nanoparticles prepared in this example is as follows: Figure 4 As shown, it can be seen that the copper nanoparticles sintered at low temperature have a smaller particle size and good dispersibility.

[0077] The particle size distribution of the copper nanoparticles prepared in this example is shown in FIG. Figure 5 As shown, this particle size distribution diagram shows that after low-temperature sintering, the average particle size of the copper nanoparticles reaches 98 nm, the particle size distribution is between 80 nm and 115 nm, and the distribution is uniform (the standard deviation is 5.02 nm, which is much lower than the copper particles obtained in Comparative Example 2).

[0078] The antibacterial activity of the copper nanoparticles prepared in this example against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) is shown in FIG. Figure 6 As shown, it can be seen that the antibacterial rate of the copper nanoparticles prepared in this example against the two bacteria reached more than 99%.

[0079] Example 2

[0080] In this example, the copper nanoparticles prepared in Example 1 were used to prepare PVA / Cu composite hydrogel. The preparation process of PVA / Cu composite hydrogel is as follows:

[0081] First, 10 mL of a 10% PVA solution and copper nanoparticles were homogenized (2 hours) to obtain a PVA / Cu composite hydrogel solution. The mass fraction of copper nanoparticles in the PVA / Cu mixed hydrogel solution was 5%. The prepared PVA / Cu composite hydrogel solution was then poured into a mold and subjected to 5 freeze-thaw cycles (-20°C, 19 hours) to obtain a PVA / Cu composite hydrogel.

[0082] The tensile response time of PVA / Cu composite hydrogel is shown in Figure 7As shown, it can be seen that the PVA / Cu composite hydrogel, as a conductive gel, exhibits a fast response of 206.8ms and 232.88ms during loading and unloading, respectively. The PVA / Cu composite hydrogel can quickly capture external stimulus signals (tensile deformation) and convert them into electrical signal outputs. This also shows that the copper nanoparticles prepared by the method of the present invention have good conductivity.

[0083] In this embodiment, 10% pure PVA hydrogel (without adding copper nanoparticles) was prepared according to the same method as the preparation process of PVA / Cu composite hydrogel, and two composite hydrogels were prepared using the two copper nanoparticles prepared in Comparative Example 1 and Comparative Example 2, respectively.

[0084] The results of testing the tensile response properties of the above three composite hydrogels and 10% pure PVA hydrogel are as follows:

[0085] Figure 8 The conductivity diagram of the composite hydrogel prepared by using the copper nanoparticles prepared in Example 1, Comparative Example 1, and Comparative Example 2. As can be seen from the figure, the composite hydrogel prepared by using the copper nanoparticles prepared in Example 1 has the best conductivity, which can reach 163.42m S / m. Compared with the composite hydrogel prepared by using the copper nanoparticles of Example 1, the composite hydrogel prepared by using the copper nanoparticles prepared in Comparative Example 1 and Comparative Example 2 has poor conductivity. Therefore, the conductive performance and sensing performance of the flexible sensor manufactured by the copper nanoparticles prepared by the method of the present invention are significantly improved.

[0086] The tensile response time of the composite hydrogel prepared using the copper nanoparticles prepared in Comparative Example 1 is shown in FIG. Fig. 9 As shown; the tensile response time diagram of the composite hydrogel prepared by using the copper nanoparticles prepared in Comparative Example 2 is as shown Fig.10 As shown. It can be seen that the comparative example 1 exhibited a response of 416.18ms and 395.76ms during the loading and unloading processes, respectively, and the comparative example 2 exhibited a response of 344.59ms and 417.72ms during the loading and unloading processes, respectively, which were significantly longer than the composite hydrogel prepared by using the copper nanoparticles prepared in Example 1 (206.8ms and 232.88ms). Therefore, the flexible sensor manufactured by using the copper nanoparticles prepared by the method of the present invention has a faster response speed.

[0087] The above scheme is only used to further describe the present invention in detail, and the above specific embodiments are only used to explain the present invention and are not used to constitute any limitation to the present invention.

Claims

1. A method for preparing antibacterial conductive copper nanoparticles, Features: The following steps are involved: 1) Preparation of a precursor solution: adding copper sulfate pentahydrate and polyvinyl pyrrolidone to ultrapure water to obtain a precursor solution; 2) Synthesis and collection of copper nanoparticles: After heating the precursor solution obtained in step 1), ascorbic acid solution and dimethylethanolamine are added in sequence at a first reaction temperature, stirred for a period of time at the first reaction temperature, and then kept warm for a period of time at a second reaction temperature to obtain a first solution; 3) Removal of the template: The first solution obtained in step 2) is filtered to obtain a precipitate, which is then washed with water, dried, and sintered at low temperature to obtain copper nanoparticles.

2. The method for preparing the antibacterial conductive copper nanoparticles according to claim 1, Features: In the precursor solution obtained in step 1), the molar concentration of copper sulfate pentahydrate is 0.1-0.2 mol / L, and the mass fraction of polyvinyl pyrrolidone is 0.49-0.8 wt %.

3. The method for preparing the antibacterial conductive copper nanoparticles according to any one of claims 1 or 2, Features: In the step 1), the molecular weight of the polyvinyl pyrrolidone is 1,300,000 to 3,000,000.

4. The method for preparing the antibacterial conductive copper nanoparticles according to any one of claims 1 or 2, Features: In the step 1), the molecular weight of the polyvinyl pyrrolidone is 3,000,000.

5. The method for preparing the antibacterial conductive copper nanoparticles according to claim 2, Features: In the step 2), the concentration of the ascorbic acid solution is 1-2 mol / L; the volume ratio of the precursor solution, the ascorbic acid solution and dimethylethanolamine is 50:10:0.3-0.

6.

6. The method for preparing the antibacterial conductive copper nanoparticles according to claim 5, Features: The step 2) is specifically as follows: 2.1) heating the precursor solution to a first reaction temperature, adding an ascorbic acid solution to the precursor solution under stirring at the first reaction temperature, and then adding dimethylethanolamine, stirring at the first reaction temperature for 1 to 2 hours to obtain an intermediate solution; the first reaction temperature is 75 to 95° C.; 2.2) keeping the intermediate solution at a second reaction temperature and vacuum environment for 4 to 8 hours to obtain a first solution; the second reaction temperature is 60 to 80°C.

7. The method for preparing antibacterial conductive copper nanoparticles according to claim 1, Features: The step 3) is specifically as follows: 3.1) Filter the first solution and take out the precipitate, wash the precipitate with deionized water and dry it at a drying temperature of 80-100° C. to obtain a dried precipitate; 3.2) subjecting the dried precipitate obtained in step 3.1) to low temperature sintering to obtain copper nanoparticles; The conditions for low-temperature sintering are: heating to 320-400° C. at a heating rate of 2-4° C. / min, and then calcining at 320-400° C. for 5-12 hours.

8. Copper nanoparticles prepared by the method for preparing antibacterial conductive copper nanoparticles according to any one of claims 1 to 7.

9. The copper nanoparticles according to claim 8, Features: The copper nanoparticles are in the shape of cubes, and have an average particle size of 80 to 115 nm.

10. A method for preparing the antibacterial conductive copper nanoparticles according to any one of claims 1 to 7 or a use of the copper nanoparticles according to any one of claims 8 to 9, Features: Used for the preparation of antibacterial agents, antibacterial materials or flexible sensors.

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