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A method for large-scale, multi-step synthesis of ultra-long silver nanowires with controllable diameter

A silver nanowire, high-volume technology, applied in the field of nanomaterials, can solve the problems of difficult to repeat experiments, difficult to precisely control the seed formation stage, and influence of the seed formation stage, to achieve precise controllability, improve optical and electrical properties, Exciting high-efficiency effects

Active Publication Date: 2018-10-23
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

In addition, the seed growth process is easily disturbed by uncontrollable factors such as additives, drug purity, temperature, humidity, and contact with air, which will have a fatal impact on the reaction in the seed crystal generation stage, resulting in the critical step of the experiment. That is, the seed formation stage is difficult to precisely control, and the experiment is difficult to repeat

Method used

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  • A method for large-scale, multi-step synthesis of ultra-long silver nanowires with controllable diameter
  • A method for large-scale, multi-step synthesis of ultra-long silver nanowires with controllable diameter

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Experimental program
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Embodiment

[0051] 1. Weigh 0.5g of polyvinylpyrrolidone, dissolve it in 150ml of ethylene glycol, and heat it at 150°C.

[0052] 2. Prepare sodium chloride ethylene glycol solution with a concentration of 0.01mol / L, and set aside; weigh 0.15g of silver nitrate, dissolve it in ethylene glycol, and set aside.

[0053] 3. Add 0.3ml of sodium chloride in ethylene glycol solution to the solution;

[0054] 4. Add the silver nitrate solution into the Erlenmeyer flask, and then add 0.1 mmol hydrogen peroxide dropwise.

[0055] 5. Rapidly raise the temperature to 175°C until turbidity appears in the solution.

[0056] 6. Lower the temperature to 130° C., and then lower the temperature naturally to prepare silver nanowires.

[0057] The scanning electron micrograph of the silver nanowire prepared by this embodiment is shown in figure 1 (a), optical photo see figure 2 . The amount of hydrogen peroxide in the embodiment is adjusted to 0.05mmol, 0.01mmol, 0.005mmol respectively, and other condi...

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Abstract

The present invention is a large-scale, multi-step method for synthesizing ultra-long silver nanowires with controllable diameter. First, the ethylene glycol solution containing polyvinylpyrrolidone and sodium chloride is fully heated to obtain a solution with strong reducing properties, and then added Silver nitrate ethylene glycol solution to generate a large number of crystal seeds; use hydrogen peroxide to screen the seeds to select a small amount of specific size seeds; immediately increase the temperature to increase the reaction rate, breaking through the threshold of nitric acid etching seed crystals; cool down for a long time to react, reduce The slow reaction rate reduces the probability of self-nucleation to generate isotropic seeds, and at the same time promotes the adsorption of small nuclei on the radial direction of large nuclei or nanowires to obtain ultra-long silver nanowires. The diameter of the silver nanowires prepared by this method can be adjusted in the range of several nanometers and microns, and the length can reach more than 300 μm, which is larger than the silver nanowires prepared by the traditional method. The production rate of the line is high, the controllability is good, batch preparation can be realized, and industrial application can be realized.

Description

technical field [0001] The invention relates to the fields of nanomaterials, waveguides and thin-film devices, in particular to a large-scale, multi-step method for synthesizing ultra-long silver nanowires with controllable diameters. Background technique [0002] Silver nanowires have the excellent electrical and thermal conductivity of bulk silver, and are the best choice for efficient transmission of electrical signals; at the same time, as one-dimensional noble metal nanomaterials, silver nanowires have surface plasmon effects, which can excite metal and The surface plasmon mode propagating at the interface of the medium binds the light beam to the nanoscale for transmission, breaking through the optical diffraction limit, and has great application potential in the field of nano-optoelectronics; in addition, silver nanowires can also interact with light to generate Surface plasmon resonance has a strong absorption of light in the ultraviolet and visible light bands, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00B22F1/0547C22C1/0466C22C5/06C30B29/60C30B29/02C30B7/14C30B33/08B22F2009/245
Inventor 张晓阳张彤薛小枚
Owner SOUTHEAST UNIV
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