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Methods for preparing silver nano-particles and conductive nano-film of silver nano-particles

A technology of silver nanoparticles and silver salts, applied in metal material coating process, coating and other directions, can solve problems such as being unfavorable to environmental protection and increasing costs

Active Publication Date: 2012-05-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods of sintering silver nanoparticles at room temperature use organic solvents, organic stabilizers and special polymers, which increase the cost and are not conducive to environmental protection

Method used

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  • Methods for preparing silver nano-particles and conductive nano-film of silver nano-particles
  • Methods for preparing silver nano-particles and conductive nano-film of silver nano-particles
  • Methods for preparing silver nano-particles and conductive nano-film of silver nano-particles

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, prepare silver nanoparticle and silver nanofilm

[0028] Add 1M ethylenediaminetetraacetic acid salt solution (pH=7.0, EDTA dissolved in 10M NaOH solution, add water to 1M) dropwise to 70g 0.1wt% (0.0004mol) AgNO 3 In the aqueous solution, until the solution turns from cloudy to clear, a total of 0.61 mL of ethylenediaminetetraacetic acid salt solution is consumed. 0.0454g (0.0004mol) of catechol was dissolved in 20g of water to obtain a catechol solution. Add the catechol solution dropwise to the prepared AgNO chelated with EDTA 3 In the solution, stirring is applied at the same time, the speed is 600 rpm, and the reaction temperature is 25°C. The dropwise addition was completed in 1 hour, and the reaction was continued for 1 hour to stop the reaction, and the solution turned gray-black. The resulting product was precipitated by centrifugation, washed with water, and repeated three times. The obtained silver nanoparticles were redispersed in 30mL of w...

Embodiment 2

[0029] Embodiment 2, preparation silver nanoparticle and silver nanofilm

[0030] Add 1M ethylenediaminetetraacetic acid salt solution (pH=7.0, EDTA dissolved in 10M NaOH solution, add water to 1M) dropwise to 70g 0.2wt% (0.0008mol) AgNO 3 In the aqueous solution, until the solution turns from cloudy to clear, a total of 1.34 mL of ethylenediaminetetraacetic acid salt solution was consumed. 0.0908g (0.0008mol) of catechol was dissolved in 20g of water to obtain a catechol solution. Slowly drop the catechol solution into the prepared EDTA chelated AgNO 3 In the solution, stirring is applied at the same time, the speed is 800 rpm, and the reaction temperature is 40°C. The dropwise addition was completed in 1 hour, and the reaction was continued for 1 hour to stop the reaction, and the solution turned gray-black. The resulting product was precipitated by centrifugation, washed with water, and repeated three times. The obtained silver nanoparticles were redispersed in 30 mL of...

Embodiment 3

[0031] Embodiment 3, preparation silver nanoparticle and silver nanofilm

[0032] A 1.5 M EDTA salt solution (tetrasodium EDTA was dissolved in water, and then adjusted to pH 7.0) was added dropwise to 70 g of 0.4 wt% (0.0016 mol) AgNO 3 In the aqueous solution, until the solution turns from cloudy to clear, a total of 1.83 mL of ethylenediaminetetraacetic acid salt solution was consumed. 0.1816g (0.0016mol) of catechol was dissolved in 40g of water to obtain a catechol solution. Add the catechol solution dropwise to the prepared AgNO chelated with EDTA 3 In the solution, stirring is applied at the same time, the speed is 900 rpm, and the reaction temperature is 80°C. The dropwise addition was completed in 1.5 hours, and the reaction was continued for one hour to stop the reaction, and the solution turned gray-black. The resulting product was precipitated by centrifugation, washed with water, and repeated three times. Gained silver nanoparticles were redispersed in 30mL of...

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Abstract

The invention discloses methods for preparing silver nano-particles and a conductive film of the silver nano-particles. The method for preparing the silver nano-particles comprises the following steps of: 1) dripping an aqueous solution of sodium salt or potassium salt of ethylenediaminetetracetic acid into an aqueous solution of soluble silver salt until the solution is changed from turbidity to clarity, and stopping dripping to obtain a silver salt solution of an ethylenediaminetetracetic acid chelate ; and 2) dripping an aqueous solution of a reducing agent into the silver salt solution of the ethylenediaminetetracetic acid chelate under stirring condition, continuing reacting after the dripping is finished until the color of the solution is not changed, and thus obtaining the silver nano-particles. The method for preparing the conductive film comprises the following steps of: dispersing the silver nano-particles prepared by the method into water, coating a dispersion liquid on a substrate, and drying to obtain a silver nano-film; and soaking the silver nano-film in a strong electrolyte solution and treating for at least 3 seconds, taking out, and drying to obtain a film consisting of clinkery silver nano-particles. The silver nano-film has excellent electrical conductivity.

Description

technical field [0001] The invention relates to a method for preparing silver nanoparticles and a conductive nano film thereof. Background technique [0002] Silver nanoparticles are a versatile metal nanomaterial. In particular, its nano-films have important applications in flexible circuits, flexible electrodes, surface-enhanced Raman spectroscopy, reflective coatings, thin-film transistors, organic light-emitting diodes, and other fields. At present, one of the main methods for preparing silver nanoparticles is the wet chemical method. The basic idea is to reduce silver ions with a reducing agent in an aqueous solution containing a small molecule or a macromolecular organic stabilizer to obtain silver nanoparticles, and use the organic stabilizer to adsorb on the silver nanoparticles. The particle surface inhibits its agglomeration and growth, thereby obtaining silver nanoparticles. The nano-film composed of silver nanoparticles prepared by the above method has a high f...

Claims

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Application Information

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IPC IPC(8): B22F9/24C23C24/00
Inventor 龙宇华吴俊杰王昊张小莉赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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