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Preparation method of nanometer silver particles

A nano-silver particle and silver source technology, applied in the field of nano-materials, can solve problems such as inconvenient storage, easy agglomeration, and instability of nano-silver particles

Active Publication Date: 2012-06-13
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although nano-scale silver particles can be prepared according to the above method, the prepared nano-silver particles are unstable in aqueous solution, easy to agglomerate, and are not easy to store.

Method used

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  • Preparation method of nanometer silver particles

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preparation example Construction

[0023] The embodiment of the present invention discloses a preparation method of nano-silver particles, comprising the following steps:

[0024] a), under the condition of stirring and heating, silver source, coating agent and ammoniacal liquor are added in water, obtain the reaction solution that pH value is 7~12, the molar ratio of described silver source and coating agent is 1: (1 ~5);

[0025] b), adding crown ether to the reaction solution under stirring, the molar ratio of the crown ether to the silver source is (1-3): 1;

[0026] c) adding a reducing agent containing alkali metal to the mixed solution obtained in step b under stirring to obtain silver nanoparticles; the molar ratio of the reducing agent to silver is (1-3):1.

[0027] In the present invention, in order to enable the nano-silver particles to be stably dispersed in water, crown ether is added to the reaction system during the reaction process, and at the same time, a reducing agent containing alkali metal...

Embodiment 1

[0037]1. Dissolve 0.01mol silver nitrate, 0.02mol ammonia water and 0.05mol polyvinylpyrrolidone in water at 80°C and stir for 30 minutes to obtain a reaction solution.

[0038] 2. Add 0.01 mol of 15-crown-5 to the reaction liquid obtained in step 1, adjust the pH value to 9-10, and stir for 20 minutes.

[0039] 3. Add 0.01 mol reducing agent sodium borohydride to the mixture obtained in step 2, and continue to stir and react for 40 minutes to obtain nano-silver.

[0040] Such as figure 1 Shown is the particle size distribution diagram of the newly prepared nano-silver. The area surrounded by the red curve in the figure is the particle size partition interval, and the blue curve is the cumulative content curve. The particle size distribution results are listed in Table 1.

[0041] The nano-silver particle size distribution result that table 1 embodiment 1 prepares

[0042]

[0043] Such as figure 2 Shown is the particle size distribution diagram of the nano-silver prep...

Embodiment 2

[0048] 1. Dissolve 0.01mol silver nitrate, 0.02mol ammonia water and 0.05mol polyvinylpyrrolidone in water at 80°C and stir for 20 minutes to obtain a reaction solution.

[0049] 2. Add 18-crown-6 to the reaction liquid obtained in step 1, adjust the pH value to 9-10, and stir for 20 minutes.

[0050] 3. Add 0.01 mol reducing agent potassium borohydride to the mixture obtained in step 2, and continue stirring for 40 minutes to obtain nano-silver.

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Abstract

The invention provides a preparation method of nanometer silver particles. The preparation method comprises the following steps of: (a) adding a silver source, a coating agent and ammonia water into water under the conditions of stirring and heating to obtain a reaction solution with the pH value being 7-12, wherein the molar ratio of the silver source to the coating agent is 1:(1-5); (b) adding crown ether into the reaction solution under a stirring state, wherein the molar ratio of the crown ether to the silver source is (1-3):1; and (c) adding a reducing agent containing alkali metal into a mixture solution obtained in (b) under a stirring state to obtain nanometer silver particles, wherein the molar ratio of the reducing agent to the silver source is (1-3):1. According to the invention, the crown ether is added into the reaction system in a reaction process, meanwhile, the reducing agent containing the alkali metal is used in a matching manner. The crown ether is added to facilitate distantiation between positive charges and negative charges in a nano-silver system, so that nano-silver can stably disperse in a water solution without agglomeration.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a method for preparing nanosilver particles. Background technique [0002] Printed electronics technology is a combination of printing technology and electronic technology, which uses conductive ink to directly print conductive lines on the substrate to replace the current etching technology. Printed electronics technology has the advantages of fewer processes, low production costs, good environmental protection, flexible production methods, and low energy consumption. It has developed rapidly in recent years. [0003] Conductive inks are a key enabler of printed electronics. Among them, nano-silver conductive ink has the advantages of low sintering temperature, excellent electrical conductivity, excellent wire-making quality and good adhesion to the substrate, so it has attracted people's attention. In recent years, many scholars at home and abroad have carried out extensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 吕新坤肖勇江林
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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