Room-temperature synthesis method and application of silver nano spiral

Abstract

The invention discloses a room-temperature synthesis method and application of silver nano-spirals. The room-temperature synthesis method comprises the following steps that 1-50 mmol / L of a silver salt solution, 5-80 g / L of a surfactant solution and 5-50 mmol / L of a reducing agent solution are prepared; the preparation method comprises the following steps: adding 1 part of a silver salt solution and 1-100 parts of a surfactant solution into deionized water, carrying out ultrasonic uniform dispersion, standing for 5-30 minutes, adding 1-300 parts of a reducing agent solution, carrying out ultrasonic uniform mixing, and standing for more than 10 hours at room temperature. After the reaction is finished, silver nano-spirals are attached to the inner wall of the container, and after being taken out, the silver nano-spirals are washed with deionized water and an ethanol solution for multiple times to remove residual reactants; and drying in a vacuum drying oven at 40-80 DEG C for more than 1 hour to obtain the silver nano spiral powder. The prepared silver nano spiral material has good stretchability and flexibility, and has wide application in the field of flexible intelligent devices.

Description

Technical Field

[0001] The present invention relates to the technical field of nanomaterials, and in particular to a room-temperature synthesis method and application of silver nanohelices. Background Art

[0002] As the forefront of modern technology, nanomaterials exhibit great application potential in various industries due to their unique physical and chemical properties. Among them, silver nanomaterials have attracted much attention due to their excellent antibacterial, conductive, and optical properties. Silver nanoparticles, due to their small size and large specific surface area, exhibit strong antibacterial ability and are widely used in the medical field to effectively kill or inhibit the growth of microorganisms, improving the treatment effect and quality of life. Silver nanorods and nanowires, due to their excellent optical and electrical properties, have great potential in optoelectronic devices, sensors, and energy storage fields, such as improving the light energy conversion efficiency of solar cells and efficiently detecting environmental gases and biomolecules. In addition, silver nanosheets and nanospheres also play important roles. Nanosheets are used in high-performance catalysts, supercapacitors, and biosensors, while nanospheres exhibit ideal properties in drug delivery, bioimaging, and tissue engineering, contributing significantly to technological progress.

[0003] Silver nanomaterials, especially silver nanowires and silver nanoparticles, exhibit great application potential in the field of flexible intelligent devices due to their excellent conductivity, good flexibility, and high transparency. As a transparent electrode, silver nanomaterials can significantly improve the color performance and energy efficiency of flexible displays while maintaining stable performance under bending conditions. In flexible sensors, silver nanomaterials are sensitive and suitable for health monitoring and human-computer interaction. In addition, silver nanomaterials enhance the light capture efficiency of flexible solar cells and the energy storage performance of supercapacitors, promoting the development of high-efficiency and long-life flexible energy devices. With their unique properties, silver nanomaterials are leading the innovation of flexible electronic technology and providing key material support for building an intelligent, convenient, and environmentally friendly future world. However, current silver nanomaterials do not have stretchability and flexibility, which limits their application in the field of flexible intelligent devices. Summary of the Invention

[0004] The present invention provides a room-temperature synthesis method and application of silver nanohelices in view of the deficiencies of the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A room-temperature synthesis method of silver nanohelices, comprising the following steps:

[0007] Prepare a silver salt solution with a concentration of 1-50 mmol / L, a surfactant solution with a concentration of 5-80 g / L, and a reducing agent solution with a concentration of 5-50 mmol / L;

[0008] Among them, the silver salt is one or more of silver trifluoroacetate, silver trifluoromethanesulfonate, silver acetate, silver nitrate, silver acetylacetonate, and silver perchlorate;

[0009] The surfactant is one or more of polyvinylpyrrolidone (PVP), cetyltrimethylammonium bromide (CTAB), polyacrylic acid (PAA), sodium polyacrylate, ammonium polyacrylate, and polyethylene glycol (PEG);

[0010] The reducing agent is one or more of ascorbic acid, sodium borohydride, sodium sulfite, glucose, and hydrazine hydrate.

[0011] Add 1 part of the silver salt solution and 1 - 100 parts of the surfactant solution to deionized water, disperse evenly by ultrasonic treatment, let it stand for 5 - 30 min, add 1 - 300 parts of the reducing agent solution, mix evenly by ultrasonic treatment, and then let it stand at room temperature for more than 10 h.

[0012] After the reaction, silver nanohelices adhere to the inner wall of the container. After taking it out, wash it repeatedly with deionized water and ethanol solution to remove the residual reactants. Dry it in a vacuum drying oven at 40 - 80 °C for more than 1 h to obtain silver nanohelix powder.

[0013] Prepare a 50 mmol / L silver acetylacetonate solution, a mixed solution of 30 g / L sodium polyacrylate and polyethylene glycol, where m(polyacrylic acid):m(polyethylene glycol)=2:1, and a 20 mmol / L sodium borohydride solution.

[0014] Prepare a 35 mmol / L silver nitrate solution, a mixed solution of 30 g / L sodium polyacrylate and polyacrylic acid, where m(polyacrylic acid):m(polyacrylic acid)=4:1, and a mixed solution of 15 mmol / L glucose and ascorbic acid, where m(glucose):m(ascorbic acid)=1:2.

[0015] Prepare a 30 mmol / L silver perchlorate solution, a 50 g / L ammonium polyacrylate solution, and a 10 mmol / L hydrazine hydrate solution.

[0016] Prepare a mixed solution of 20 mmol / L silver trifluoroacetate and 5 mmol / L silver acetate solution, a mixed solution of 55 g / L polyvinylpyrrolidone and cetyltrimethylammonium bromide, where m(polyvinylpyrrolidone):m(cetyltrimethylammonium bromide)=2:1.5, and a 42 mmol / L glucose solution.

[0017] Prepare a 22 mmol / L silver acetylacetonesulfonate solution, a 55 g / L sodium polyacrylate solution, and a 10 mmol / L ascorbic acid solution.

[0018] Preparation method of silver nanohelix conductive framework,

[0019] Weigh a certain amount of silver nanohelix powder, disperse it in deionized water, and quickly freeze and shape it in an extremely low temperature environment (minus 200 °C). Remove the solvent from the shaped ice in a freeze dryer to obtain a fluffy silver nanohelix conductive framework, which can be used as a stretchable flexible conductive material for flexible intelligent devices.

[0020] In the preparation method of the silver nanohelix conductive framework, the dosage ratio of silver nanohelix powder to deionized water is 1:60 - 100 g / ml.

[0021] Application of silver nanohelix materials and silver nanohelix conductive frameworks in flexible intelligent devices.

[0022] The silver nanohelix material prepared by the present invention has good stretchability and flexibility, and has broad applications in the field of flexible intelligent devices. Description of the Drawings

[0023] Figure 1 SEM image of the silver nanohelix prepared in Example 1.

[0024] Figure 2 SEM image of the silver nanohelix prepared in Example 2.

[0025] Figure 3 SEM image of the silver nanohelix prepared in Example 3.

[0026] Figure 4 SEM close-up image of a part of the silver nanohelix.

[0027] Figure 5 SEM overall image of the silver nanohelix.

[0028] Figure 6 Physical image of the silver nanohelix conductive framework.

[0029] Figure 7 XPS data image of the silver nanohelix sample prepared in Example 3.

[0030] Figure 8 XRD data image of the silver nanohelix sample prepared in Example 3.

[0031] Figure 9 Data image of the change in resistance during tensile deformation of the silver nanohelix conductive framework.

[0032] Figure 10 Data image of the change in resistance during compressive deformation of the silver nanohelix conductive framework. Detailed Embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Example 1 Preparation of silver nanohelices:

[0035] Prepare a 50 mmol / L silver acetylacetonate solution, a mixed solution of 30 g / L sodium polyacrylate and polyethylene glycol, where m(sodium polyacrylate):m(polyethylene glycol)=2:1, and a 20 mmol / L sodium borohydride solution.

[0036] Add 3 mL of the silver acetylacetonate solution and 4 mL of the mixed solution of sodium polyacrylate and polyethylene glycol to 30 mL of water, ultrasonically disperse evenly, let stand for 15 min, add 5 mL of the sodium borohydride solution, ultrasonically mix evenly and then let stand at room temperature for 30 h.

[0037] After 30 h, silver nanohelices adhere to the inner wall of the container. After taking them out, wash them with deionized water and ethanol solution for many times to remove the residual reactants. Dry them in a vacuum drying oven at 40 °C for 10 h to obtain silver nanohelix powder. The SEM image of the silver nanohelices prepared in this example is as Figure 1 shown.

[0038] Example 2 Preparation of silver nanohelices:

[0039] Prepare a 35 mmol / L silver nitrate solution, a mixed solution of 30 g / L sodium polyacrylate and polyacrylic acid, where m(polyacrylic acid):m(polyacrylic acid)=4:1, and a mixed solution of 15 mmol / L glucose and ascorbic acid, where m(glucose):m(ascorbic acid)=1:2.

[0040] Add 7 mL of the silver nitrate solution and 5 mL of the mixed solution of sodium polyacrylate and polyethylene glycol to 50 mL of water, ultrasonically disperse evenly, let stand for 15 min, add 7 mL of the sodium borohydride solution, ultrasonically mix evenly and then let stand at room temperature for 40 h.

[0041] After 40 h, silver nanohelices adhere to the inner wall of the container. After taking them out, wash them with deionized water and ethanol solution for many times to remove the residual reactants. Dry them in a vacuum drying oven at 40 °C for 5 h to obtain silver nanohelix powder. The SEM image of the silver nanohelices prepared in this example is as Figure 2 shown.

[0042] Example 3 Preparation of silver nanohelices:

[0043] Prepare a 30 mmol / L silver perchlorate solution, a 50 g / L ammonium polyacrylate solution, and a 10 mmol / L hydrazine hydrate solution.

[0044] Add 5 mL of silver acetylacetonate solution and 10 mL of ammonium polyacrylate solution into 50 mL of water, disperse them uniformly by ultrasonication, let them stand for 15 min, add 7 mL of sodium borohydride solution, mix them uniformly by ultrasonication, and let them stand at room temperature for 24 h.

[0045] After 24 hours, silver nanohelices adhered to the inner wall of the container. After being taken out, they were washed with deionized water and ethanol solution several times to remove the residual reactants. They were dried in a vacuum drying oven at 40°C for 10 hours to obtain silver nanohelices powder. The SEM image of the silver nanohelices prepared in this example is shown in FIG. Figure 3 As shown, Figure 6 The XPS data of the silver nanohelix prepared in this example is shown, indicating that the silver element in the sample is mainly zero-valent silver. Figure 7 The XRD data of the silver nanohelix prepared in this example is shown, which also shows that the sample is a single substance of silver.

[0046] Example 4 Preparation of silver nanohelices:

[0047] Prepare a mixed solution of 20mmol / L silver trifluoroacetate and 5mmol / L silver acetate solution, a mixed solution of 55g / L polyvinyl pyrrolidone and hexadecyltrimethylammonium bromide, where m(polyvinyl pyrrolidone):m(hexadecyltrimethylammonium bromide)=2:1.5, and 42mmol / L glucose solution.

[0048] Add 5 mL of a mixed solution of silver trifluoroacetate and silver acetate and 10 mL of polyvinyl pyrrolidone and hexadecyltrimethylammonium bromide solution into 50 mL of water, disperse uniformly by ultrasonication, let stand for 15 min, add 30 mL of glucose solution, mix uniformly by ultrasonication, and let stand at room temperature for 24 h.

[0049] Example 5 Preparation of silver nanohelices:

[0050] Prepare 22mmol / L silver acetylacetone sulfonate solution, 55g / L sodium polyacrylate solution, and 10mmol / L ascorbic acid solution.

[0051] Add 6 mL of silver acetylacetonate solution and 12 mL of ammonium polyacrylate solution to 50 mL of water, disperse them uniformly by ultrasonication, let them stand for 15 min, add 6 mL of ascorbic acid solution, mix them uniformly by ultrasonication, and let them stand at room temperature for 24 h.

[0052] Example 6 Application of silver nanohelix in flexible smart devices:

[0053] Weigh 0.5 g of the silver nanohelix powder prepared in Example 3, disperse it in 30 mL of deionized water, quickly freeze and shape it at -200 °C, and then remove the solvent in vacuo in a freeze dryer for the shaped ice cubes to obtain a fluffy silver nanohelix conductive framework. This silver nanohelix framework can be used as a stretchable flexible conductive material for flexible intelligent devices.

[0054] Test method for the resistance of the silver nanohelix conductive framework: Cut the prepared silver nanohelix conductive framework into small pieces of 1×1×0.3 cm, fix them on a tensile tester, use the tensile tester to stretch and compress the conductive framework, and measure the resistance change of the conductive framework during this process with a four-probe resistance tester. The resistance of the conductive framework in the initial state is 0.4 Ω / cm. As Figure 9 shown, as the conductive framework is stretched, its resistance gradually increases, and the resistance is 3.2 Ω / cm when the deformation reaches 100%; as Figure 10 shown, as the conductive framework is compressed, its resistance gradually decreases, and the resistance is 0.18 Ω / cm when the deformation reaches 100%.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A room temperature synthesis method of silver nanohelices, characterized in that: The following steps are involved: Step 1: prepare 1-50mmol / L silver salt solution, 5-80g / L surfactant solution and 5-50mmol / L reducing agent solution; wherein the silver salt is one or more of silver trifluoroacetate, silver trifluoromethanesulfonate, silver acetate, silver nitrate, silver acetylacetonate and silver perchlorate; the surfactant is one or more of polyvinylpyrrolidone (PVP), hexadecyltrimethylammonium bromide (CTAB), polyacrylic acid (PAA), sodium polyacrylate, ammonium polyacrylate and polyethylene glycol (PEG); the reducing agent is one or more of ascorbic acid, sodium borohydride, sodium sulfite, glucose and hydrazine hydrate; Step 2: Add 1 part of silver salt solution and 1-100 parts of surfactant solution to deionized water, disperse uniformly by ultrasonication, let stand for 5-30 minutes, add 1-300 parts of reducing agent solution, mix uniformly by ultrasonication, and let stand at room temperature for more than 10 hours; Step 3: After the reaction is completed, silver nanohelices are attached to the inner wall of the container. After being taken out, they are washed with deionized water and ethanol solution for multiple times to remove the residual reactants; and dried in a vacuum drying oven at 40-80°C for more than 1 hour to obtain silver nanohelical powder.

2. The room temperature synthesis method of silver nanohelices according to claim 1, characterized in that: In step 1, prepare 50mmol / L silver acetylacetonate solution, 30g / L sodium polyacrylate and polyethylene glycol mixed solution, wherein m(polyacrylic acid):m(polyethylene glycol)=2:1, and 20mmol / L sodium borohydride solution.

3. The room temperature synthesis method of silver nanohelices according to claim 1, characterized in that: In step 1, prepare 35mmol / L silver nitrate solution, 30g / L sodium polyacrylate and polyacrylic acid mixed solution, where m(polyacrylic acid):m(polyacrylic acid)=4:1, and 15mmol / L glucose and ascorbic acid mixed solution, where m(glucose):m(ascorbic acid)=1:

2.

4. The room temperature synthesis method of silver nanohelices according to claim 1, characterized in that: In step 1, 30 mmol / L silver perchlorate solution, 50 g / L ammonium polyacrylate solution, and 10 mmol / L hydrazine hydrate solution are prepared.

5. The room temperature synthesis method of silver nanohelices according to claim 1, characterized in that: In step 1, a mixed solution of 20 mmol / L silver trifluoroacetate and 5 mmol / L silver acetate solution, a mixed solution of 55 g / L polyvinyl pyrrolidone and hexadecyl trimethyl ammonium bromide, wherein m (polyvinyl pyrrolidone): m (hexadecyl trimethyl ammonium bromide) = 2:1.5, and a 42 mmol / L glucose solution are prepared.

6. The room temperature synthesis method of silver nanohelices according to claim 1, characterized in that: In step 1, 22 mmol / L silver acetylacetone sulfonate solution, 55 g / L sodium polyacrylate solution, and 10 mmol / L ascorbic acid solution were prepared.

7. A method for preparing a silver nanohelical conductive skeleton, characterized in that: A certain amount of silver nanohelix powder prepared by the method described in any one of claims 1 to 6 is weighed, dispersed in deionized water, quickly frozen and shaped in an extremely low temperature environment, and the shaped ice cubes are vacuum-dried to remove the solvent to obtain a fluffy silver nanohelix conductive skeleton, which can be used as a stretchable flexible conductive material for flexible smart devices.

8. The preparation method according to claim 7, characterized in that: The dosage ratio of silver nano-helical powder to deionized water is 1:60-100 g / ml.

9. Application of the silver nanohelical conductive skeleton prepared according to the preparation method of claim 7 or 8 in flexible intelligent devices.

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