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

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...

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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

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