Multistep method for synthesizing diameter controllable ultralong silver nanowires on large scale
A silver nanowire, large-scale technology, applied in the field of nanomaterials, can solve problems such as difficult to repeat experiments, difficult to accurately control the seed formation stage, and the impact of the seed formation stage, to achieve precise controllability, improve optical and electrical properties, The effect of high excitation efficiency
Active Publication Date: 2017-03-29
SOUTHEAST UNIV
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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
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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 cool down 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 conditions remain...
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Abstract
The invention discloses a multistep method for synthesizing diameter controllable ultralong silver nanowires on a large scale. Firstly, an ethylene glycol solution containing polyvinylpyrrolidone and sodium chloride is fully heated, a solution with a strong reducing property is obtained, then, a silver nitrate ethylene glycol solution is added, and a large number of seed crystals are generated; hydrogen peroxide is used for screening a small number of seed crystals with a specific size out of the seed crystals; the temperature is raised immediately to increase the reaction rate, and the threshold value of sculpturing the seed crystal by nitric acid is broken through; and the temperature is reduced, a reaction is carried out for a long time, the reaction rate is reduced, the probability of generating isotropy seed crystals through self-seeding nucleation is reduced, meanwhile, small cores are promoted to be adsorbed in the radial directions of large cores or the nanowires, and the ultralong silver nanowires are obtained. The diameters of the silver nanowires prepared through the method are adjustable within the range of several nanometer or micrometer scales, and the length can reach 300 micrometers or above; compared with silver nanowires prepared through a traditional method, the ultralong silver nanowires prepared through the method are larger in diameter adjusting range and larger in length; and the nanowires prepared through the method are high in yield and good in controllability, and batch preparation and industrial application can be achieved.
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...
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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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