Method for preparing silver nanometer wire with controllable wire diameter by cation control microwave method

A silver nanowire and cation technology, applied in the field of nano silver wire material preparation, can solve the problems of thick wire diameter and low aspect ratio

Active Publication Date: 2011-04-27
JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing silver nanowires with controllable wire diameter by cation-controlled microwave method to overcome the problems of thick wire diameter and low aspect ratio in the preparation of silver nanowires by existing microwave methods

Method used

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  • Method for preparing silver nanometer wire with controllable wire diameter by cation control microwave method
  • Method for preparing silver nanometer wire with controllable wire diameter by cation control microwave method
  • Method for preparing silver nanometer wire with controllable wire diameter by cation control microwave method

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Embodiment 1

[0045] Follow the preparation process. Mix 0.4g of silver nitrate and 0.8g of PVP into a beaker filled with 30g of ethylene glycol according to a mass ratio of 1:2, and stir ultrasonically for 5-10 minutes to obtain a uniform transparent solution; add 0.04g of sodium chloride and continue ultrasonically stirring 2 to 3 minutes; at this time, it is a milky white suspension, which is the precursor for preparing silver nanowires. The prepared suspension was put into a microwave oven, and the reaction conditions were: 2.45GHz, 320W, 5min. After the reaction, the solution was centrifuged at 4000r / min for 8min. The obtained solid was dispersed with 50 ml of water, washed ultrasonically, centrifuged again, and the product was dried at room temperature. The scanning electron microscope test sample is to stick the sample on the aluminum base sample stage, figure 1 The SEM photos of the silver nanowires obtained according to Example 1 are given. from figure 1 It can be seen from th...

Embodiment 2

[0047]Follow the preparation process. According to the mass ratio of 1:1.5, mix 0.35g of silver nitrate powder and 0.525g of PVP into a beaker filled with 20g of ethylene glycol, and ultrasonically stir for 5 to 10 minutes to obtain a uniform transparent solution; add 0.035g of manganese chloride, Continue ultrasonic stirring for 2 to 3 minutes to prepare the precursor of silver nanowires. The prepared suspension was put into a microwave oven, and the reaction conditions were: 2.45GHz, 320W, 4.5min. After the reaction, the solution was centrifuged at 4000r / min for 8min. The obtained solid is dispersed with 50ml of ethanol and processed by ultrasonic washing, centrifuged again, and the product is dried at normal temperature. The scanning electron microscope test sample is to stick the sample on the aluminum base sample stage, figure 2 Provided according to the SEM photo of the silver nanowire that embodiment 2 obtains, from figure 2 It can be seen that the average diameter...

Embodiment 3

[0049] Follow the preparation process. According to the mass ratio of 1:1.38, mix 0.34g silver nitrate and 0.55g PVP into a beaker filled with 25g ethylene glycol, and stir ultrasonically for 5-10 minutes to obtain a uniform transparent solution; add 0.02g sodium sulfide and continue ultrasonic stirring for 2 ~3 minutes, it is the precursor for preparing silver nanowires. The prepared suspension was put into a microwave oven, and the reaction conditions were: 2.45GHz, 320W, 4min. After the reaction, the solution was centrifuged at 4000r / min for 8min. The obtained solid was dispersed with 50ml of ethanol (or water), washed ultrasonically, centrifuged again, and dried at room temperature. The scanning electron microscope test sample is to stick the sample on the aluminum base sample stage, image 3 The SEM photograph of the silver nanoparticle that obtains according to embodiment 3 is provided, from image 3 It can be seen that the average diameter of silver nanowires is 350...

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Abstract

The invention provides a method for preparing silver nanometer wire with controllable wire diameter by a cation control microwave method, aiming at solving the problems of rough wire diameter, low diameter ratio and the like during preparation of the silver nanometer wire by the traditional microwave method. The method comprises the following steps of: (1) adding a mixture of silver nitrate powder and a dispersing agent into ethylene glycol and preparing a solution reaction system containing silver ions; (2) adding a cation control agent in the solution reaction system containing silver ions and evenly stirring to obtain a reaction precursor; and (3) irradiating the reaction precursor under microwave, centrifuging, ultrasonically washing and drying the solution prepared through microwave irradiation to obtain the silver nanometer wire powder with controllable wire diameter. The invention has the advantages of simple preparation method, high efficiency and low cost and ensures that the high-quality silver nanometer wire can be prepared repeatedly within wide range of reaction condition. By using a soft template method, the size of the wire diameter is controlled by using the cation control agent without introducing any impurity.

Description

technical field [0001] The invention relates to the field of preparation of nano-silver wire materials, in particular to a method for preparing silver nano-wire materials with controllable diameter by a cation-controlled microwave-assisted soft template method. Background technique [0002] Nanoscience and nanotechnology are currently one of the most dynamic research fields. In nanomaterials, because the nanoscale size is equivalent to or smaller than the physical characteristic size such as the wavelength of light, the de Broglie wavelength, and the coherence length of the superconducting state, The periodic boundary conditions of the crystal are destroyed; the atomic density near the surface layer of nanoparticles is reduced; the mean free path of electrons is very short, and the locality and coherence are enhanced. The size reduction also greatly reduces the number of atoms contained in the nanosystem, and the macroscopically fixed quasi-continuous energy bands are transf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C30B29/02C30B29/62
Inventor 姜清奎王铮汤砚蔚丁渐宝常振宇
Owner JIANGSU NANOWELL ADVANCED MATERIALS SCI&TECH
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