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Method for purifying ultrafine silver nanowires

A nanowire and ultra-fine silver technology, applied in the field of nanowire materials, can solve problems such as complicated process and poor purification effect, and achieve the effect of low haze, low cost, and simple and easy method

Inactive Publication Date: 2019-03-08
SHAANXI COAL & CHEM TECH INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purification techniques reported in the current literature and patents either involve toxic chemicals, or the process is complicated, or the purification effect is not good.

Method used

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  • Method for purifying ultrafine silver nanowires
  • Method for purifying ultrafine silver nanowires
  • Method for purifying ultrafine silver nanowires

Examples

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Effect test

preparation example Construction

[0028] (1) Preparation of unpurified ultrafine silver nanowires:

[0029] (i) Preparation of sodium bromide in ethylene glycol solution: weigh a certain amount of sodium bromide and dissolve it in ethylene glycol, stir and dissolve on a heating plate at 100°C-150°C for 1min-180min, the concentration is 1mM- 1000mM;

[0030] (ii) Preparation of ethylene glycol solution of sodium chloride: Weigh a certain amount of sodium chloride and dissolve it in ethylene glycol, stir and dissolve on a heating plate at 100°C-150°C for 1min-180min, the concentration is 1mM- 1000mM;

[0031] (iii) Preparation of PVP ethylene glycol solution: weigh a certain amount of PVP and dissolve it in ethylene glycol, stir and dissolve on a heating plate at 100°C-150°C for 1min-180min, and the concentration is 0.01mM-10mM;

[0032] (iv) Preparation of ethylene glycol solution of silver nitrate: Weigh a certain amount of silver nitrate and dissolve it in ethylene glycol, and ultrasonicate for 5s-500s in a...

Embodiment 1

[0037] (1) Preparation of sodium bromide in ethylene glycol solution: weigh 0.4572g of sodium bromide and dissolve in 20mL of ethylene glycol, stir and dissolve on a heating plate at 130°C for 2h;

[0038] (2) Preparation of ethylene glycol solution of sodium chloride: Weigh 0.2466g of sodium chloride and dissolve in 20mL of ethylene glycol, stir and dissolve on a heating plate at 130°C for 2 hours;

[0039] (3) Preparation of PVP ethylene glycol solution: weigh 1.68g of PVP with a molecular weight of 360,000, dissolve it in 30mL of ethylene glycol, and stir and dissolve it on a heating plate at 130°C for 5 minutes;

[0040] (4) Preparation of silver nitrate solution in ethylene glycol: weigh 0.6765g of silver nitrate, dissolve it in 15mL of ethylene glycol, and sonicate in an ice-water bath at a temperature of 5°C for 5min in an ultrasonic instrument;

[0041] (5) Preparation of unpurified ultrafine silver nanowires: get 116mL of ethylene glycol and pour it into a 250mL round...

Embodiment 2

[0044]On the basis of Example 1, just change step (6) to take 10 mL of silver nanowire solution, add 90 mL of deionized water, and centrifuge to remove ethylene glycol and PVP, dilute to 1 mg / mL with deionized water, and then drop Ammonia water was added to 0.1 mM, and the container was left to stand for 9 hours, and the mass percentage of the ultrafine silver nanowires could reach 72%.

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Abstract

The invention provides a method for purifying ultrafine silver nanowires. The method comprises the following steps that firstly, the unpurified ultrafine silver nanowires are prepared; and secondly, the unpurified ultrafine silver nanowires prepared in the step 1 are taken and washed with a solvent, then the unpurified ultrafine silver nanowires are dissolved through a solvent, then aqueous ammonia is dropped in, still standing is conducted, bottom precipitate is removed, and thus a purified ultrafine silver nanowire solution is obtained. The aqueous ammonia is added to the unpurified ultrafine silver nanowire solution, Ostwald ripening of silver nanoparticles in the unpurified ultrafine silver nanowire solution is assisted by the aqueous ammonia, growth of the silver nanoparticles is induced, and then the grown silver nanoparticles can be separated from the silver nanowires through a still standing process without other complicated purifying processes, and the ultrafine silver nanowires with the mass percent being 60% to 85% and the diameter being 20 nm to 30 nm are obtained.

Description

technical field [0001] The invention belongs to the technical field of nanowire materials and relates to a method for purifying ultrafine silver nanowires. Background technique [0002] Silver is the most conductive metal material in nature. Silver nanowires have both excellent conductivity and ductility, and the film materials composed of them show better performance than indium tin oxide (ITO) transparent conductive films, and will be used in the field of flexible, bendable and stretchable electronic products in the future. play a key role. Especially with the development of the Internet of Things, the demand for flexible display screens is increasing, and the silver nanowire transparent conductive film has become a new material to replace the ITO transparent conductive film material. The properties of the silver nanowire transparent conductive film increase with the decrease of the diameter of the nanowire. Among them, haze is a key performance index, which directly de...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0547B22F1/07B22F1/145
Inventor 魏葳叶长辉黄林泉赵炎吴泽磊陈微微雷国伟顾瑜佳张晓东杨钊
Owner SHAANXI COAL & CHEM TECH INST
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