A method for preparing ultrafine ultrahigh aspect ratio silver nanowires

A technology of silver nanowires and aspect ratio, applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of high toxicity of reducing agents, low yield of silver nanowires, affecting the application of silver nanowires, etc., to achieve The effect of easy control of reaction conditions and excellent flexibility

Active Publication Date: 2021-11-30
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent discloses the conditions for the synthesis of silver nanowires with an aspect ratio greater than 2500, in this preparation condition, the reducing agent hydrazine hydrate used has a strong reducibility and a fast reaction with silver nitrate, and it is easy to produce a large amount of silver nanowires. Particles and short silver nanorods, not only the yield of silver nanowires is low, but also greatly affect the application of silver nanowires
And what this patent uses is a strong reducing agent, no control agent, and the reducing agent used is highly toxic

Method used

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  • A method for preparing ultrafine ultrahigh aspect ratio silver nanowires
  • A method for preparing ultrafine ultrahigh aspect ratio silver nanowires
  • A method for preparing ultrafine ultrahigh aspect ratio silver nanowires

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Experimental program
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Effect test

Embodiment 1

[0034] 2g glucose, 1ml 0.2mol / L NH 4 Br, 2mL 0.2mol / L NH 4Cl was added to a solution containing 40 mL of polyvinylpyrrolidone with a concentration of 0.025 g / mL (solvent being ethylene glycol) to obtain solution A; 0.4 g of silver nitrate was added to 20 ml of ethylene glycol solution to prepare 0.02 g / mL of solution B; Heat solution A to 160°C under nitrogen protection, then add solution B to solution A at a rate of 0.25 mL / min; adjust the stirring speed to 80 r / min. After reacting for 1 hour, stop the reaction, and cool it to room temperature, then add 200ml of ethanol for centrifugal washing, and the obtained silver nanowires have a length of about 56 microns, a diameter of about 16 nanometers, and an aspect ratio of about 3500. like figure 1 shown. The square resistance (R 0 ) is 268Ω / □, the light transmittance is 99.1%, and the rear resistance is 446Ω / □ after repeated bending 1000 times, R / R 0 <2, showing good flexibility.

Embodiment 2

[0036] 2g glucose, 1ml 0.2mol / L NH 4 Br, 2mL 0.2mol / L NH 4 Cl was added to a solution containing 40 mL of polyvinylpyrrolidone with a concentration of 0.025 g / mL (solvent being ethylene glycol) to obtain solution A; 0.4 g of silver nitrate was added to 20 ml of ethylene glycol solution to prepare 0.02 g / mL of solution B; Heat solution A to 180°C under nitrogen protection, then add solution B to solution A at a rate of 0.25 mL / min; adjust the stirring speed to 80 r / min. After reacting for 1 hour, stop the reaction, and cool it to room temperature, then add 200ml of ethanol and wash it by centrifugation. The obtained silver nanowires have a length of about 68 microns, a diameter of about 20 nanometers, and an aspect ratio of about 3400. Its appearance is as follows: figure 2 shown. The square resistance (R 0 ) is 198Ω / □, the light transmittance is 97.6%, and the rear resistance is 235Ω / □ after repeated bending 1000 times, R 0 / R<2, with better flexibility.

Embodiment 3

[0038] 3g glucose, 1ml 0.2mol / L NH 4 Br, 2mL 0.2mol / L NH 4 Cl was added to a solution containing 40 mL of polyvinylpyrrolidone with a concentration of 0.025 g / mL (solvent being ethylene glycol) to obtain solution A; 0.4 g of silver nitrate was added to 20 ml of ethylene glycol solution to prepare 0.02 g / mL of solution B; Heat solution A to 160°C under nitrogen protection, then add solution B to solution A at a rate of 0.25 mL / min; adjust the stirring speed to 80 r / min. After reacting for 2 hours, stop the reaction, and cool it to room temperature, then add 200ml of ethanol for centrifugal washing, the obtained silver nanowires have a length of about 80 microns, a diameter of about 23 nanometers, and an aspect ratio of 3480. Its appearance is as follows: image 3 shown. The square resistance (R 0 ) is 180Ω / □, the light transmittance is 96.9%, and the rear resistance (R) after bending 1000 times is 241Ω / □, R / R 0 <2, showing good flexibility.

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Abstract

The invention relates to a method for preparing ultrafine ultrahigh aspect ratio silver nanowires, (1) adding a reducing agent and a control agent to an ethylene glycol solution of polyvinylpyrrolidone (K88‑96); (2) adding nitric acid Silver is dissolved in ethylene glycol; (3) after heating the solution obtained in step (1) to a certain temperature, slowly add the solution obtained in step (2) dropwise; (4) slowly stir and continue to react for a period of time; the reaction solution is cooled to At room temperature, add a washing solvent and centrifuge and wash once to obtain ultrafine and ultrahigh aspect ratio silver nanowires. Compared with the prior art, the present invention obtains ultrafine PVP with a diameter of 16nm, a length of 56μm, and an aspect ratio of up to 3500 by precisely controlling the molecular weight and dosage of PVP, the stirring speed in the reaction and the dropping speed of the silver nitrate solution. Silver nanowires with ultra-high aspect ratio, the method is simple to operate and can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of preparation of flexible one-dimensional nanometer materials, in particular to a method for preparing ultrafine and ultrahigh aspect ratio silver nanowires. Background technique [0002] Flexible transparent conductive films have extremely high transparency in the visible light range, can be bent and folded into certain shapes, and have great application potential in liquid crystal displays, wearable devices, solar cells, flexible sensors, etc. In recent years, with the rapid development of smartphones, tablet computers and other smart device displays, the demand for high-performance flexible transparent conductive films has expanded dramatically. At present, most of the traditional transparent displays on the market use indium tin oxide (ITO). However, ITO is brittle, has scarce raw materials, high cost, and is easily corroded, which greatly limits its application in flexible electronic devices. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB22F9/24B82Y40/00B22F1/07B22F1/0547
Inventor 赵亚平肖丁
Owner SHANGHAI JIAOTONG UNIV
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