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Nano silver particles with multilevel structure and preparation method thereof

A nano-silver particle and nano-technology, which is applied in the field of nano-structured materials, can solve the problems of insufficient thermal conductivity and electrical conductivity of conductive silver paste.

Active Publication Date: 2012-12-26
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal conductivity and electrical conductivity of this traditional conductive silver paste are still not good enough, making more and more researchers pay attention to how to further improve the thermal conductivity and electrical conductivity of conductive silver paste

Method used

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  • Nano silver particles with multilevel structure and preparation method thereof
  • Nano silver particles with multilevel structure and preparation method thereof
  • Nano silver particles with multilevel structure and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0031] Such as figure 1 Shown, the preparation method of the nano-silver particle of the hierarchical structure of an embodiment, comprises the steps:

[0032] Step S110: dissolving the surfactant and the soluble silver salt in the solvent according to the mass ratio of the surfactant to the soluble silver salt being 0.5-5:1 to form a mixed solution.

[0033] Among them, the surfactant is sodium dodecylbenzene sulfonate, sodium hexadecyl sulfonate, sodium oleate, sodium stearate, alpha-olefin sulfonate and sodium dioctyl sulfosuccinate A sort of.

[0034] These kinds of surfactants are all anionic surfactants, which ionize long-chain anionic groups in polar solvents, and ionize soluble silver salts to form silver cations. Due to the attraction of positive and negative charges, the shape of the product can be controlled during reduction. .

[0035] Wherein, the soluble silver salt is a soluble silver salt commonly used in the art, for example, silver perchlorate, silver nitr...

Embodiment 1

[0053] The preparation of the nano-silver particles of the hierarchical structure prepared by the present embodiment is as follows:

[0054] (1) Take 0.25 g of sodium dodecylbenzene sulfonate, add it to 25 ml of deionized water, and stir until the sodium dodecylbenzene sulfonate is completely dissolved after ultrasonic treatment to obtain water / sodium dodecylbenzene sulfonate solution;

[0055] (2) Take 0.5 g of silver nitrate, add it into 20 ml of deionized water, dissolve it completely, and obtain an aqueous solution of silver nitrate.

[0056] (3) After mixing the water / sodium dodecylbenzene sulfonate solution and the aqueous solution of silver nitrate evenly, add 2.0 grams of zinc flakes, and place them in a 200 ml stainless steel pressure reaction kettle with a polytetrafluoroethylene liner. In a digitally-programmed temperature-controlled high-temperature oven, heat-retain and react at 40°C for 1 hour, then raise the temperature to 100°C, and heat-react at 100°C for 7 h...

Embodiment 2

[0061] The preparation of the nano-silver particles of the hierarchical structure prepared by the present embodiment is as follows:

[0062] (1) Take 2.0 grams of sodium cetyl sulfonate, add it to 100 ml of glycerin, and stir after ultrasonic treatment until the sodium cetyl sulfonate is completely dissolved to obtain glycerol / sodium cetyl sulfonate solution;

[0063] (2) Take 1.0 g of silver nitrate, add it to 20 ml of glycerin, and dissolve it completely to obtain a solution of silver nitrate in glycerin.

[0064] (3) After mixing the glycerol / sodium cetyl sulfonate solution and the glycerol solution of silver nitrate evenly, add 4.0 grams of hydroxylamine hydrochloride and place it in a 200 ml stainless steel pressure reactor with a polytetrafluoroethylene liner placed in a high-temperature oven with digital display program temperature control, kept at 120°C for 1 hour, then raised the temperature to 160°C, and kept at 160°C for 4 hours to obtain a reaction mixture.

[00...

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Abstract

The invention relates to nano silver particles with a multilevel structure, which comprise silver inner cores with the particle sizes of 100 nm to 200 nm and a plurality of silver nano microparticles with the particle sizes of 5 nm to 20 nm. Conductive silver paste obtained by the nano silver particles with the multilevel structure has a large surface area and has better dispersibility after being mixed with epoxy resin, the binding force between the conductive silver paste and the epoxy resin is strengthened and holes of the epoxy resin are reduced, so that passages capable of further conducting heat and electricity are provided, and thus, the conductive silver paste prepared from the nano silver particles with the multilevel structure has better heat conduction and electricity conduction performances. Moreover, the invention also aims to provide a preparation method of the nano silver particles with the multilevel structure.

Description

technical field [0001] The invention relates to the field of nano-structure materials, in particular to nano-silver particles with a multi-level structure and a preparation method thereof. Background technique [0002] Nano-silver particles have a wide range of applications in optical detection, heat dissipation, electrical conductivity, catalysts, biomedicine, lubricating materials, and dielectric materials. Due to the remarkable characteristics of long life, high luminous efficiency, no radiation and low power consumption, LED semiconductor lighting is considered to be a new generation of solid-state cold light source that is most likely to enter the field of general lighting in the 21st century. The key factor of the light efficiency and service life of the chip. Usually, metal fillers such as silver, copper, tin, aluminum powder, etc. are used for filling to prepare composite thermally conductive adhesives. This type of adhesive has been widely used in the bonding of L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 赵涛孙蓉梁先文胡友根
Owner SHENZHEN INST OF ADVANCED TECH
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