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Silver nano-particle coated by organic acid silver, method for preparing silver nano-particle and application thereof

A technology of nano-silver particles and organic acid silver, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of agglomeration and large particle size, and achieve the effects of simple operation, broad industrial application prospects, and easy implementation

Inactive Publication Date: 2016-10-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of agglomeration and large particle size involved in the preparation of nano-silver by liquid-phase chemical method in the prior art, the purpose of the present invention is to provide a kind of organic acid silver-coated nano-silver particle and its preparation method and application

Method used

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  • Silver nano-particle coated by organic acid silver, method for preparing silver nano-particle and application thereof
  • Silver nano-particle coated by organic acid silver, method for preparing silver nano-particle and application thereof
  • Silver nano-particle coated by organic acid silver, method for preparing silver nano-particle and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Using lauric acid etc. as raw materials to prepare organic acid silver-coated nano-silver particles, the specific steps are as follows:

[0030] (1) Mix 0.015 mol of NaOH, 0.016 mol of lauric acid and 600 ml of deionized water, and heat to 80°C, then add 0.015 mol of silver nitrate, stir for 1.5 hours, let stand and separate layers, take out the upper layer of white The waxy substance is silver laurate with a small amount of impurities;

[0031] (2) Centrifuge the white waxy substance in the above step (1) for 3 times and 1 time respectively with deionized water and alcohol, the centrifugal rate is 7000r / min, and the cleaning time is 10min each time, the purpose is to remove impurities; then It was dried at a temperature of 80° C., and the drying time was 6 hours; finally, it was heated to 250° C. in nitrogen and kept at a temperature of 90 minutes to obtain powdered silver laurate-coated silver nanoparticles.

[0032] figure 2 It is the TEM photograph of the silver ...

Embodiment 2

[0034] Use ascorbic acid etc. as raw material to prepare organic acid silver-coated nano-silver particles, the specific steps are as follows:

[0035] (1) Mix 0.014 mol of NaOH, 0.015 mol of ascorbic acid and 550 ml of deionized water, and heat to 80°C, then add 0.02 mol of silver nitrate, stir for 1.5 hours, let stand and separate layers, take the upper white The waxy substance is silver ascorbate with a small amount of impurities;

[0036] (2) The white waxy substance in the above step (1) is centrifugally cleaned 4 times and 1 time respectively with deionized water and alcohol, the centrifugal rate is 7000r / min, and the cleaning time is 10min each time, the purpose is to remove impurities; then It was dried at a temperature of 75° C., and the drying time was 8 hours; finally, it was heated to 230° C. in nitrogen and kept at a temperature of 100 minutes to obtain powdered silver ascorbate-coated silver nanoparticles.

[0037] image 3 It is the TEM photo of the silver asco...

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Abstract

The invention discloses a silver nano-particle coated by organic acid silver, a method for preparing the silver nano-particle and application thereof. The silver nano-particle coated by the organic acid silver is characterized in that the silver nano-particle is coated by the organic acid silver, the average particle sizes of coated particles range from 6 nm to 12 nm, and the coated particles are uniformly dispersed. The method for preparing the silver nano-particle coated by the organic acid silver includes (1), mixing NaOH, organic acid and deionized water with one another to obtain first mixtures, heating the mixtures until the temperature of the first mixtures reaches a certain temperature, immediately adding silver nitrate into the first mixtures, stirring the silver nitrate and the first mixtures to obtain second mixtures, allowing the second mixtures to stand still, layering the second mixtures and acquiring upper-layer white waxy substances; (2), centrifuging, washing and drying the white substances obtained at the step (1), then heating the white substances in nitrogen until the temperature of the white substances reaches 220-280 DEG C and preserving heat for 80-100 min to obtain the silver nano-particle coated by the organic acid silver. The silver nano-particle, the method and the application have the advantages that the method is easy to implement and low in cost, is safe and reliable and has a broad industrial application prospect, and the prepared silver nano-particle coated by the organic acid silver can be used as brazing filler metal for electronic packaging.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and specifically relates to an organic acid silver-coated nano-silver particle and its preparation method and application. The nano-silver particle prepared by the method is coated with organic matter to avoid the agglomeration of the nano-particle, and can be directly used as a solder Used in the field of electronic packaging. Background technique [0002] In the microelectronics industry, leaded solder has been widely used due to its advantages of easy handling, good wettability and low price. However, lead and its compounds are toxic substances, and long-term use will cause harm to the environment and humans, so lead-containing solders are gradually banned by various countries. At present, the widely used lead-free solders include Sn-Bi, Sn-Ag-Cu and Sn-Cu, etc. These solders have the characteristics of low melting point. However, when electronic packaging materials need to withstand high temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/14B23K35/40B22F9/30
CPCB22F9/30B23K35/0244B23K35/40
Inventor 毛样武王珂叶盼盼王升高王戈明陈喆
Owner WUHAN INSTITUTE OF TECHNOLOGY
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