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Silver nanometer wire synthesizing process

A technology of silver nanowires and synthesis methods, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve problems such as product quality uncertainty, unfavorable large-scale preparation, and impact on electrical conductivity, and achieve excellent dispersion , good structure and mechanical properties, and the effect of reducing reaction costs

Inactive Publication Date: 2006-03-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is a relatively simple method for synthesizing silver nanowires, but they use platinum as a seed crystal, which means that non-silver heteroatoms are introduced during the synthesis process, which affects the conductivity and causes uncertainty in product quality , and currently this reaction can only be carried out at low concentrations (<0.1M)
Patents CN1522951A and CN1424163A disclose methods for synthesizing single crystal silver nanowires respectively, but the synthesis concentration is relatively low, which is not conducive to large-scale preparation

Method used

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  • Silver nanometer wire synthesizing process
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  • Silver nanometer wire synthesizing process

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Vacuumize a closed 50ml three-neck flask equipped with a condensing reflux device and fill it with argon, and place it in an oil bath at 160°C; add 2ml of ethylene glycol, stir with a magnetic stirrer, and preheat for 10min; -4 M AgNO 3 Add 1ml of ethylene glycol solution into the three-neck flask, react for 15min; then add AgNO with a concentration of 0.1M 3 Add 5ml of ethylene glycol solution into the three-neck bottle, control the speed at 900ml / h, and add 10ml of PVP ethanol solution with a concentration of 0.15M dropwise at the same time, keep the speed at 60ml / h, and react for 6h; Add 30ml of acetone to a 100ml beaker, mix well, pour into a centrifuge tube and centrifuge at 3000rpm for 30min, remove the upper solution; then add 40ml of ethanol, ultrasonic for 1min to disperse the precipitate, then centrifuge at 3000rpm, remove the upper solution; repeat once ; Then disperse the purified silver nanowires with 5ml of ethanol, transfer them to a watch glass, and dry...

Embodiment 2

[0035] Vacuumize a closed 50ml three-neck flask equipped with a condensing reflux device and fill it with argon, and place it in an oil bath at 160°C; add 2ml of ethylene glycol, stir with a magnetic stirrer, and preheat for 10min; -4 M AgNO 3 Add 1ml of ethylene glycol solution into the three-neck flask, react for 30min; then add AgNO with a concentration of 0.1M 3Add 5ml of ethylene glycol solution into the three-necked bottle, and the speed is controlled at 1500ml / h. At the same time, 10ml of PVP ethylene glycol solution with a concentration of 0.15M is added dropwise, keeping the speed at 100ml / h, and reacting for 1h; after the reactants are naturally cooled, Pour into a 100ml beaker, add 30ml of acetone and mix evenly, pour into a centrifuge tube and centrifuge at 5000rpm for 30min, remove the upper solution; then add 40ml of ethanol, ultrasonication for 1min to disperse the precipitate, then centrifuge at 5000rpm, remove the upper solution; Repeat once; then disperse th...

Embodiment 3

[0037] Vacuumize a closed 50ml three-necked flask equipped with a condensing reflux device and fill it with argon, and place it in an oil bath at 200°C; add 2ml of ethylene glycol, stir with a magnetic stirrer, and preheat at 200°C for 10 minutes; 2×10 -4 M AgNO 3 Add 1ml of ethylene glycol solution into the three-necked flask, and react at 200°C for 30min; then lower the temperature of the oil bath to 160°C, and then add AgNO 3 Add 5ml of ethylene glycol solution into the three-necked bottle, and the speed is controlled at 2000ml / h. At the same time, 10ml of PVP ethylene glycol solution with a concentration of 0.15M is added dropwise, keeping the speed at 60ml / h, and reacting for 2h; after the reactants are naturally cooled, Pour into a 100ml beaker, add 30ml of acetone and mix evenly, pour into a centrifuge tube and centrifuge at 4000rpm for 30min, remove the upper solution; then add 40ml of ethanol, ultrasonic for 1min to disperse the precipitate, then centrifuge at 4000rp...

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Abstract

The present invention belongs to the field of nanometer material preparing technology, and provides a two-step silver nanometer wire synthesizing process with high form selectivity and high efficiency. Under the protection of inert gas, very dilute ethylene glycol solution of silver nitrate is first added into ethylene glycol to prepare silver crystal seed; ethylene glycol solution of silver nitrate in relatively high concentration and ethylene glycol polymer solution in the corresponding concentration and volume are then added into the reaction system with crystal seed; and through crystal growth, silver nanometer wire is obtained. By means of regulating reaction condition, the size and form of the silver nanometer wire may be controlled. The present invention has low reaction cost and high silver nanometer wire yield, and the obtained silver nanometer wire has high purity, good structure and high mechanical performance.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for synthesizing silver nanowires. Background technique [0002] One-dimensional nanomaterials, such as nanowires, nanofibers, nanorods, nanoribbons, etc., are widely used in nanoelectronic devices, nanometer Lasers, nanochemical and biological sensors, nanoprobes, nanocomposites, etc. Silver nanowires are the most important one-dimensional nanomaterials. Their excellent electrical and thermal conductivity and chemical stability also make silver nanowires play an important role in the construction of nanodevices. At present, there have been many literature reports on the synthesis of silver nanowires. According to the different principles, they can be roughly divided into the following categories: template method, polyol method, hydrothermal method, wet chemical method, biomimetic synthesis method, molecular self-assembly induction method, electrochemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B9/02
Inventor 王立陈昌
Owner ZHEJIANG UNIV
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