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A method for rapid and large-scale preparation of silver nanowires with high aspect ratio

A high aspect ratio, nano silver wire technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of small aspect ratio, long reaction time and poor conductivity of silver nanowires, and achieve high concentration The effect of rapid mass preparation, simple preparation method and high efficiency

Inactive Publication Date: 2011-11-30
JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above methods can prepare silver nanowire materials, but the reaction conditions are very complicated, the reaction time is very long, generally takes 2 to 3 hours, the aspect ratio of the prepared silver nanowires is relatively small, and the yield is relatively low. ; or other particles need to be introduced, such as adding platinum nanoparticles as a catalyst during the reaction, resulting in impure products
The microwave method makes it possible to quickly prepare silver nanowire materials. Chinese patents: (1) A method for preparing silver nanowires in large quantities (application number: 200810019828.6), (2) a method for preparing noble metal nanowires in batches (application number For: 200810163102.X) (3) A microwave-assisted method for preparing silver nanostructure materials with different shapes (application number: 200910006131.X) (4) A method for preparing silver nanowires with controllable diameter by cation-controlled microwave method , (Application No.: 201010559335.9) respectively reported the preparation of silver nanowire materials by microwave-assisted wet chemical method. Although the reported silver nanowire materials can be prepared, the diameters of the prepared silver nanowire materials are relatively short Generally speaking, it does not exceed 30 microns, and the aspect ratio is relatively small. In this way, when preparing electrode materials, under the same filling rate, the nano silver wire with a low aspect ratio is longer than the nano silver wire with a high aspect ratio due to the number of nodes. The number of lines is greatly increased, and its conductivity is an order of magnitude worse

Method used

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  • A method for rapid and large-scale preparation of silver nanowires with high aspect ratio
  • A method for rapid and large-scale preparation of silver nanowires with high aspect ratio
  • A method for rapid and large-scale preparation of silver nanowires with high aspect ratio

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Effect test

Embodiment 1

[0055] Carry out according to preparation process: (1) the silver nitrate of 0.1mol is joined in 480ml ethylene glycol, the solution reaction system containing silver ion is prepared, then the polyvinylpyrrolidone of 0.3mol that K value is 30 joins this solution system , prepare a solution system containing silver ions; (2) add 0.1mmol of NaCl powder to 20ml ethylene glycol, stir evenly to obtain a clear solution system; (3) add the solution to the prepared solution in step (1) Add dropwise the ethylene glycol solution of 20mlNaCl obtained in step (2) and concentrated nitric acid 0.01mol, the molar concentration of nitric acid in the solution is 0.02mol / L, the pH value of the solution is 1.7, continue to stir evenly, and obtain the reaction precursor, (4 ) using the method of microwave irradiation, irradiating the obtained precursor under 400W microwave for 14min to obtain a silver nanowire material with high aspect ratio, and centrifuging and washing the solution obtained afte...

Embodiment 2

[0058] Carry out according to preparation process: (1) the silver acetate of 0.1mol is joined in 480ml ethylene glycol, prepare the solution reaction system containing silver ion, then the polyvinylpyrrolidone of 0.3mol with K value 30 joins this solution system In, prepare the solution system containing silver ion; (2) the MnCl of 0.5mmol 2 Add the powder into 20ml of ethylene glycol and stir evenly to obtain a clear solution system; (3) Add 20ml of MnCl prepared in step (2) dropwise to the solution prepared in step (1) 2 The ethylene glycol solution and concentrated nitric acid 0.0125mol, the molar concentration of nitric acid in the solution is 0.025mol / L, the pH value of the solution is 1.6, continue to stir evenly, and obtain the reaction precursor, (4) adopt the method of microwave irradiation, will get This precursor was irradiated under 480W microwave, and the silver nanowire material with high aspect ratio was obtained for 15 minutes. The solution obtained after micro...

Embodiment 3

[0060] Carry out according to preparation process: (1) the silver nitrate of 0.05mol is joined in the ethylene glycol of 240ml, prepares the solution reaction system containing silver ion, then the polyvinylpyrrolidone of 0.2mol of K value is 30 joins this solution system In, prepare the solution system containing silver ion; (2) the MnCl of 0.2mmol 2 Add the powder into 10ml of ethylene glycol and stir evenly to obtain a clear solution system; (3) Add 10ml of MnCl prepared in step (2) dropwise to the solution prepared in step (1) 2 ethylene glycol solution and concentrated nitric acid 0.0125mol, the molar concentration of nitric acid in the solution is 0.05mol / L, the pH value of the solution is 1.3, continue to stir evenly, and obtain the reaction precursor (4) adopt the method of microwave irradiation, the obtained The precursor was irradiated under 320W microwave for 17min to obtain a silver nanowire material with a high aspect ratio, and the solution obtained after microwa...

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Abstract

Disclosed is a method suitable for efficiently producing silver nanowires with high aspect ratio. In this method, silver nanowires with aspect ratio of more than 300 and purity of more than 80% are produced through an acid compound mediated microwave-assisted wet chemistry method. Such silver nanowires are especially suitable for the application in the flexible transparent electrodes, as they can simultaneously improve the electrical conductivity and transparency.

Description

technical field [0001] The invention relates to the field of preparation of nano-silver wire materials, in particular to a method for rapidly and mass-preparing nano-silver wires with high aspect ratio. Background technique [0002] In nanomaterials, because the nanoscale size is equivalent to or smaller than the physical characteristic size such as the wavelength of light, De Broglie wavelength, and the coherence length of the superconducting state, the periodic boundary conditions of the crystal are destroyed; the surface layer of nanoparticles is near The atomic density decreases; the mean free path of electrons is very short, and the locality and coherence are enhanced. Because of this, the performance of nanomaterials is closely related to its structure, and factors such as its size, geometry, and crystallinity will have a significant impact on its performance. Controlling the shape of nanomaterials has become a key means for material scientists to find new materials w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C30B29/02C30B29/62C22B11/00
CPCB82Y40/00B22F1/0025B82Y30/00B22F9/24C30B29/02C30B7/14C30B29/60B22F1/0547
Inventor 姜清奎常振宇丁渐宝
Owner JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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