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Method for manufacturing silver nanowires using ionic liquid

Inactive Publication Date: 2015-11-12
INSCON TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a technology that allows for the uniform preparation of small silver nanowires in a solution. These nanowires have a high aspect ratio, meaning they are long and thin. When these nanowires are formed into a three-dimensional network on a surface, they create a low-resistivity, high-light-transmittance material. This technology can be used to create efficient and transparent materials for various applications.

Problems solved by technology

However, the ITO thin film is problematic in that its production cost is very high and it is easily damaged due to the difference in thermal expansibility or thermal shrinkability between the ITO thin film and a base film.
Particularly, since the brittleness of the ITO thin film formed on a polymer film is very high, when this ITO thin film is used as a transparent electrode film of a touch screen panel, there is a problem of the ITO thin film being cracked by mechanical or physical deformation.
However, in such methods of synthesizing silver nanowires, different shapes of silver nanoparticles as well as silver nanowires are simultaneously prepared, so it is not suitable for using these silver nanoparticles as a transparent electrode material.
In this case, there are problems in that granular silver nanostructures must be separated from silver nanostructures after the preparation of silver nanostructures, and in that the yield of silver nanowires is low.

Method used

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  • Method for manufacturing silver nanowires using ionic liquid
  • Method for manufacturing silver nanowires using ionic liquid
  • Method for manufacturing silver nanowires using ionic liquid

Examples

Experimental program
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Effect test

example 1

Preparation of Silver Nanowires Using Ionic Liquid Containing Chlorine Ion (Cl−) as Additive in Polyol Reaction

[0041]0.1 mol of AgNO3, 0.15 mol of PVP and 0.001 mol of 1-ethyl-3-methylimidazolium chloride (EMIM-Cl) were dissolved in 1 L of ethyleneglycol (EG), and were then stirred at room temperature for 10 minutes to obtain a transparent mixed solution. The color of the mixed solution became gray as soon as the mixed solution was reacted at 150° C. for about 30 minutes. Subsequently, the mixed solution was cooled to room temperature, filtered by a filter having a pore size of 1 μm, dried, and then observed using a scanning electron microscope. As shown in the photograph of FIG. 3, it was observed that silver nanowires having a diameter of 55˜65 nm and a length of 10˜30 μm were uniformly formed. Further, it was observed that, differently from the results of Comparative Example 1 in which an ionic liquid was not used, silver nanoparticles having different shapes from the silver nano...

example 2

Preparation of Silver Nanowires Using Ionic Liquid Containing Chlorine Ion (Cl−) as Additive in Polyol Reaction

[0042]Example 2 is the same as Example 1, except that 0.001 mol of 1-butyl-3-methylimidazolium chloride (BMIM-Cl) was used as an ionic liquid. As shown in the photograph of FIG. 4, it was observed that silver nanowires having a diameter of 55˜65 nm were uniformly formed. Further, it was observed that, similarly to the results of Example 1, silver nanoparticles having different shapes from the silver nanowires were not discovered. Comparing the results of Example 2 with the results of Example 1, it was observed that the shapes of silver nanowires were not changed or were only slightly changed depending on the length of an alkyl group of an imidazolium-based ionic liquid having a cation.

example 3

Preparation of Silver Nanowires Using Ionic Liquid Containing Bromine Ion (Br−) as Additive in Polyol Reaction

[0043]Example 3 is the same as Example 2, except that 0.001 mol of 1-butyl-3-methylimidazolium bromide (BMIM-Br) was used as an ionic liquid. As shown in the photograph of FIG. 5, it was observed that silver nanowires having a diameter of about 30 nm were uniformly formed. Further, it was observed that, similarly to the results of Example 1, silver nanoparticles having different shapes from the silver nanowires were not discovered. Comparing the results of Example 3 with the results of Example 2, it was observed that the shapes and diameters of silver nanowires were changed depending on the anion of the ionic liquid.

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Abstract

The present invention relates to a method of preparing silver nanowires having a diameter of less than 100 nm and a length of 10 μm or more, and, more particularly, to a method of uniformly preparing silver nanowires having a high aspect ratio using an ionic liquid as an additive in addition to a silver salt precursor, a reducing solvent and a capping agent in a polyol process. When the technology of the present invention is used, silver nanowires having a diameter of less than 100 nm and a length of 10 μm or more can be uniformly prepared. Further, when a transparent conductive film is formed by applying a silver nanowire-dispersed solution onto a base film, the transparent conductive film has a surface resistivity of 101˜103Ω / □ and a light transmittance of 90% or more to the base film.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of preparing silver nanowires and, more particularly, to a method of uniformly preparing silver nanowires having an aspect ratio of 100 or more (for example, having a diameter of less than 100 nm and a length of 10 μm or more) using a silver salt precursor, a reducing solvent, a capping agent and an ionic liquid.BACKGROUND ART[0002]Recently, touch screen panels have been used as important components of various types of electric, electronic and communication appliances, such as smart phones, tablet computers, etc.[0003]A transparent electrode film is used as a main component of a touch screen panel. As the transparent electrode film, a film having a surface resistivity of 500Ω / □ and a light transmittance of 90% or more to a base film is used. Currently, indium tin oxide (ITO) is generally used as a transparent electrode material. A transparent electrode film having a surface resistivity of 50˜500Ω / □ and a light transmitta...

Claims

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Application Information

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IPC IPC(8): B22F9/24C22B3/00C22C5/06B22F1/00B22F1/062
CPCB22F9/24C22C5/06C22B11/04B22F1/004B82Y30/00B22F1/0547B22F1/062
Inventor SUH, KWANG SUCKKIM, JONG EUNKIM, TAE YOUNG
Owner INSCON TECH
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