Preparation method of silver nanowire with high length-diameter ratio

A technology of silver nanowires and high aspect ratio, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of uneven aspect ratio and achieve high yield

Inactive Publication Date: 2019-09-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the silver nanowires prepared by this patented method usually have a diameter of ≧40 nanometers, an aspect ratio of ≦1000 and are not uniform

Method used

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  • Preparation method of silver nanowire with high length-diameter ratio
  • Preparation method of silver nanowire with high length-diameter ratio
  • Preparation method of silver nanowire with high length-diameter ratio

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preparation example Construction

[0046] A kind of preparation method of silver nanowire with high aspect ratio of the present invention comprises the following steps:

[0047] S1. Take a surfactant and dissolve it in an organic solvent to obtain a solution A;

[0048] S2. Take the silver salt precursor and dissolve it in an organic solvent to obtain a solution B;

[0049] S3. Add solution A and solution B into the hypergravity reactor from the liquid inlet of the hypergravity reactor respectively, solution A and solution B are mixed and reacted in the packing layer of the hypergravity reactor, and a dispersed solution containing nanocrystalline nuclei is obtained. Liquid C, after circulating for a period of time, the dispersion C is discharged from the outlet;

[0050] S4, transporting the dispersion C to a tank reactor, heating and stirring, and reacting to obtain a silver nanowire stock solution;

[0051] S5. Washing the silver nanowire stock solution with water and ethanol to remove redundant surfactants...

Embodiment 1

[0075] A high-gravity preparation method for silver nanowires with a high aspect ratio, comprising the following steps:

[0076] (1) Take 3g of polyvinylpyrrolidone K90, 24mg of sodium bromide, and 24mg of sodium chloride, add 80mL of ethylene glycol, and stir to obtain solution A;

[0077] (2) Take 0.5g of silver nitrate, add 20mL of ethylene glycol, and ultrasonically dissolve to obtain solution B;

[0078] (3) Add solution A and solution B into the hypergravity reactor, the hypergravity rotation speed is 1500rpm, mix and react at 80°C for 15min to obtain dispersion C;

[0079] (4) Transfer the dispersion C to a kettle reactor at 160°C, the reaction kettle speed is 200rpm, stop stirring after stirring for 30 minutes, and continue to react for 30 minutes;

[0080] (5) Washing the reaction product twice with deionized water and absolute ethanol respectively, and then adding polyacrylic acid to disperse in ethanol to obtain high-purity silver nanowires.

[0081] The target si...

Embodiment 2

[0086] Repeat Example 1, its difference is only: in the preparation process step (1) polyvinylpyrrolidone K90 is replaced with polyvinylpyrrolidone K30, consumption is promoted to 5g, silver nitrate is replaced with silver acetate in step (2), Other process parameters remained unchanged, and silver nanowires with a diameter of 30 nm and a length of 40 μm were prepared, with an aspect ratio of 1333.

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Abstract

The invention discloses a preparation method of a silver nanowire with a high length-diameter ratio. The preparation method comprises the following steps that a surfactant is taken and dissolved in an organic solvent to obtain a solution A; a silver salt precursor is taken and dissolved in an organic solvent to obtain a solution B; the solution A and the solution B are mixed and react in a supergravity reactor, and a dispersion liquid C containing a silver halide nanocrystal nucleus is generated; and the dispersion liquid C is conveyed into a kettle type reactor, and finally the silver nanowire is prepared through an alcohol thermal reduction method. According to the method, the supergravity technology is adopted in the nucleation and growth processes of crystal nucleus, and the silver halide crystal nucleus with small particle diameter and uniform particle size can be prepared; and the preparation method has the following advantages that (1) the prepared silver nanowire is small in diameter, large in length-diameter ratio and uniform in length; (2) no silver nanoparticles exist in the product, and the silver nanowire does not need to be obtained by separation; and (3) the method is high in yield and suitable for large-scale preparation of the silver nanowire.

Description

technical field [0001] The invention relates to the technical field of preparation of nanomaterials, in particular to a method for preparing silver nanowires with high aspect ratio. Background technique [0002] In recent years, with the rapid development of electronic products, people have higher and higher requirements for touch screens. The new generation of touch screen products must have the characteristics of high light transmittance, high conductivity, and flexibility. The traditional conductive material indium tin oxide (ITO) cannot meet the increasingly high requirements due to scarcity of resources, high production cost, and lack of flexibility. One-dimensional metal nanomaterials have attracted more and more attention of researchers because of their unique electrical, thermal, magnetic and optical properties. Among the one-dimensional metallic nanomaterials, silver nanowires have been the most studied due to their high electrical and thermal conductivity. Silver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/0547B22F1/07
Inventor 陈建峰鲍俊曾晓飞
Owner BEIJING UNIV OF CHEM TECH
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