Silver nanowire preparation method

A silver nanowire, silver nitrate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reactor corrosion, reduce service life, increase costs, etc., to avoid pollution, The effect of reducing harshness

Active Publication Date: 2015-05-13
SUZHOU UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method is relatively simple, concentrated acid (including concentrated hydrochloric acid and concentrated nitric acid) is required during the experiment. On the one hand, a subsequent neutralization step is required, which increases the cost of the reaction; on the other hand, it will cause corrosion to the reactor. , thereby reducing its service life; in addition, the diameter of the silver nanowire material prepared by this method is between 98nm and 376nm, the length is between 26 microns and 72 microns, and its aspect ratio is less than 1000, which is not easy to precipitate, so it is in A centrifuge is required for the purification step

Method used

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[0024] The preparation method of the silver nanowire of the present invention comprises the following steps: (a) dissolving polyvinylpyrrolidone in ethylene glycol to obtain a polyvinylpyrrolidone ethylene glycol solution; (b) dissolving silver nitrate in ethylene glycol, Obtain silver nitrate ethylene glycol solution; (c) take anhydrous ferric chloride and dissolve it in ethylene glycol to obtain ferric chloride ethylene glycol solution; (d) add the silver nitrate ethylene glycol solution to the Polyvinylpyrrolidone ethylene glycol solution or adding the polyvinylpyrrolidone ethylene glycol solution to the silver nitrate ethylene glycol solution, stirring and mixing to obtain the first mixed solution; the mass of the polyvinylpyrrolidone and the silver nitrate The ratio is 1~9:1; (e) Add ferric chloride ethylene glycol solution and ionic liquid ethylene glycol solution to the first mixed solution respectively, stir and mix and react at a temperature lower than the boiling poin...

Embodiment 1

[0028] Weigh 0.1g of polyvinylpyrrolidone (PVP) and 0.1g of silver nitrate AgNO 3 Dissolve in 20ml ethylene glycol (EG) respectively, and stir well to make polyvinylpyrrolidone PVP and silver nitrate AgNO 3 Fully dissolved; then add 700 μmol / L anhydrous ferric chloride FeCl with a mass of 5 g 3 The ethylene glycol EG solution of 5 g of 700 μmol / L 1-ethyl-3-methylimidazole chloride in ethylene glycol EG solution was fully stirred and mixed. The above mixed solution was reacted at 100° C. for 16 hours, and then the reaction was terminated. The product is separated to obtain a precipitate, washed with acetone for 1 to 2 times, and then dispersed in ethanol or water to obtain the product silver nanowire, such as figure 1 shown.

Embodiment 2

[0030] Weigh 0.5g polyvinylpyrrolidone PVP and 0.1g silver nitrate AgNO 3 Dissolve in 20ml ethylene glycol EG respectively, stir well, make polyvinylpyrrolidone PVP and silver nitrate AgNO 3 Fully dissolved; then add 500 μmol / L anhydrous ferric chloride FeCl with a mass of 7 g 3The ethylene glycol EG solution of 700 μmol / L 1-ethyl-3-ethylimidazole bromide in ethylene glycol EG solution was fully stirred and mixed. The above mixed solution was placed at a temperature of 150° C. for 17 hours, and then the reaction was terminated. The product is separated to obtain a precipitate, washed with acetone for 1 to 2 times, and then dispersed in ethanol or water to obtain the product silver nanowire, such as figure 2 shown.

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Abstract

The invention relates to a silver nanowire preparation method which comprises the following steps: (a), taking polyvinylpyrrolidone, dissolving polyvinylpyrrolidone in ethylene glycol; (b), taking silver nitrate, and dissolving silver nitrate in ethylene glycol; (c), taking ferric chloride anhydrous and dissolving ferric chloride anhydrous in ethylene glycol; (d), mixing the silver nitrate-ethylene glycol solution with the polyvinylpyrrolidone-ethylene glycol solution to obtain a first mixed solution, wherein the mass ratio of polyvinylpyrrolidone to silver nitrate is 1-9 to 1; (e), respectively adding a ferric trichloride-ethylene glycol solution and an ionic liquid-ethylene glycol solution in the first mixed solution, and reacting for 2-24 hours at a temperature lower than the boiling temperature of ethylene glycol after stirring and mixing to obtain a shiny white mixed solution; (f), flushing silver nanowires obtained after solid-liquid separation with acetone, and dispersing the silver nanowires in water or absolute ethyl alcohol to obtain a nanowire dispersion liquid, wherein the step (a), the step (b) and the step (c) are not ordered. The average ratio of length and diameter of the silver nanowire is greater than 1,000.

Description

technical field [0001] The invention belongs to the field of metal nanomaterials, and relates to a preparation method of silver nanowires, in particular to a preparation method of ultra-long silver nanowires. Background technique [0002] In recent years, the research of transparent electrodes based on silver nanowires has received more and more attention. Compared with traditional ITO, it has comparable electrical conductivity and light transmittance, better flexibility, and more abundant resources. Due to the nanoscale size effect, it also has excellent light transmission and flex resistance. Therefore, it is considered to be the most likely material to replace the traditional ITO transparent electrode, which provides the possibility to realize flexible and bendable LED displays, touch screens, etc., and a large number of studies have applied it to thin-film solar cells. In addition, due to the large aspect ratio effect of silver nanowires, it also has outstanding advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00
Inventor 严锋张也张伟
Owner SUZHOU UNIV
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