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Methods of rapid preparation of silver nanowires with high aspect ratio

a technology of aspect ratio and silver nanowire, which is applied in the direction of polycrystalline material growth, crystal growth process, transportation and packaging, etc., can solve the problems of complex reaction conditions, time-comsuming drawbacks, and complex processes, and achieve high manufacturing efficiency, high aspect ratio, and high purity

Inactive Publication Date: 2014-04-17
JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a method to make silver nanowires using a scalable process that is highly efficient in manufacturing. The method uses an acid compound and microwaves to assist in producing high-aspect ratio, high-purity silver nanowires. This allows for a more consistent and efficient production of this material.

Problems solved by technology

US patent with application number 2011 / 0048170 A1 discloses a method for controlling metal nanowires morphologies by purging inert gas, which makes the processes complicated and troublesome.
The drawbacks of time-comsuming is actually also a common problem for traditional polyol process.
In both cases, high-pressure vessels were required, as reaction temperatures exceeded 100° C. Another problem is complicated reaction conditions and still producing mixed nanostructures (e.g., the silver nanowires were accompanied by the formation of silver nanoparticles, or impurities introduced by the seed “Pt”).
However, Tsuji and Gou's results indicate this mechanism is not applicable to the synthesis of Ag nanowires under rapid microwave(MW)-polyol method in the presence of Cl− anions They did the experiments to fabricate Ag nanostructures under bubbling air or N2 gas and obtained silver nanowires in high yield (>90% without isolation) under bubbling air, while mixtures of cubes, bipyramids, and wires under bubbling N2 gas.
Although all the methods above can be used to prepare silver nanowires, the reaction conditions are complicated, the reaction needs 2˜3 hours, the aspect ratio of silver nanowires and also the output is low.
Some methods need platinum nanopaticles as catalyst, which cause the impurity of silver nanowires.

Method used

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  • Methods of rapid preparation of silver nanowires with high aspect ratio
  • Methods of rapid preparation of silver nanowires with high aspect ratio
  • Methods of rapid preparation of silver nanowires with high aspect ratio

Examples

Experimental program
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example 1

[0122]The following solutions were prepared using said chemicals:[0123]0.14 g HCl (0.0038 mol) solution in 100 ml EG (the ‘HCl Solution’)[0124]0.1 g HNO3 (0.0016 mol) solution in 2 ml EG (the ‘HNO3 Solution’)[0125]2.55 g AgNO3 (0.015 mol) in 100 ml EG (the ‘AgNO3 Solution’—made up to be homogeneous at least 30 min before adding to the reaction)[0126]2.55 g PVP (0.0225) (55,000 MW) in 70 ml EG (the ‘PVP Solution’)

Procedure:

[0127]To a 100 mL glassy beaker, was added the PVP solution, 0.7 mL of the HCl solution, 1.5 ml HNO3 solution, 10 ml AgNO3 solution. The mixture was then vigorous stirred for homogeneity. The reaction mixture was then transferred to a microwave oven and then treated with microwave irradiation using 320 W within 5 min. The silver nanowires solution was thus obtained and the reaction was permitted to cool to room temperature. The silver nanowires solution was poured into 250 mL of ethanol. Centrifugalization is used to remove unnecessary solvent and PVP. FIGS. 1A and...

example 2

[0128]The following solutions were prepared using said chemicals:[0129]1.2 g NaCl (0.02 mol) in 100 ml Glycerol (the ‘NaCl Solution’)[0130]1 g HNO3 0.016 mol) solution in 20 ml Glycerol (the ‘HNO3 Solution’)[0131]0.34 g AgNO3 (0.002 mol) in 10 ml Glycerol (the ‘AgNO3 Solution’—made up to be homogeneous at least 30 min before adding to the reaction)[0132]3 g PVP (0.027 mol) (13,0000 MW) in 20 mL Glycerol (the ‘PVP Solution’)

Procedure:

[0133]To a 50 ml glassy beaker, was added the PVP solution, 5 mL of the NaCl solution, 1 ml HNO3 solution, 10 ml AgNO3 solution. The mixture was then vigorous stirred for homogeneity at 25° C. The reaction mixture was then transferred to a microwave oven and then treated with microwave irradiation using 400 W. The irradiation is keeping on until the temperature of the reaction mixture gets to 150° C., and then the temperature of the reaction mixture is maintained for another 1 hours by moving the reaction mixture to a oven settled at 150° C. The silver n...

example 3

[0134]The following solutions were prepared using said chemicals:[0135]0.25 g (0.002 mol) MnCl2 in 100 ml ethylene glycol (the ‘MnCl2 Solution’)[0136]0.3 g HNO3 (0.0048 mol) solution in 100 ml Glycerol (the ‘HNO3 Solution’)[0137]2.5 g AgNO3 (0.0147 mol) in 100 ml ethylene glycol (the ‘AgNO3 Solution’—made up to be homogeneous at least 30 min before adding to the reaction)[0138]5 g PVP (13,0000 MW) (0.045 mol) and 5 g PVP (55,000 MW) (0.045 mol)in 200 ml Glycerol (the ‘PVP Solution’)

Procedure:

[0139]To a 500 ml glassy beaker, was added the PVP solution, 20 mL of the MnCl2 solution, 50 ml HNO3 solution, 100 ml AgNO3 solution. The mixture was then vigorous stirred for homogeneity at 25° C. The reaction mixture was then transferred to a microwave oven and then treated with microwave irradiation using 1200 W. The irradiation is keeping on until the temperature of the reaction mixture gets to 140° C., and then the temperature of the reaction mixture is maintained for another 3 hours by mov...

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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

FIELD OF THE INVENTION[0001]The present invention pertains to the microwave-assisted wet chemistry methods of efficiently preparing metal nanowires, while controlling the purity and aspect ratio of the same.INTRODUCTION [0002]Nanomaterials can differ markedly from their analogous bulk counterparts. In particular, the physical and chemical properties of nanomaterials correlate strongly with their size, shape and morphology. Hence, material scientists pay great attention on developing simple and effective methods for synthesis of nanomaterials with controllable morphology (including shapes and sizes), hence tailoring their properties.[0003]Silver, for the excellent electrical and thermal conductivity, are widely used in electronic industry, especially used to fabricate conductive adhesives, inks, electrodes, etc. Some of the recent reports have been directed to adaptations of the polyol process for the production of various selected nanostructures, including multiply twinned particles...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F9/24
CPCB22F9/24C30B7/14C30B29/02C30B29/60B82Y30/00B82Y40/00B22F1/0547
Inventor JIANG, QINGKUICHANG, ZHENYUDING, JIANBAO
Owner JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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