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Method for preparing nanometer flake silver powder through chemical deposition

A technology of chemical deposition and flaky silver powder, which is applied in the field of preparation of nano-thick flaky silver powder, can solve the problems of uncontrollable, many influencing factors, rough surface, etc., and achieve uniform thickness of powder flakes, precise control of thickness, and smooth surface smooth effect

Inactive Publication Date: 2013-03-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical ball milling method has high energy consumption, many influencing factors, the preparation process is easily contaminated by impurities, and the product technical indicators are unstable, especially the flake silver powder has a wide particle size distribution, rough surface, uneven thickness and uncontrollable
In the electronic paste prepared from it, the contact between conductive particles is a rough surface-to-surface contact, resulting in high contact resistance and low conductivity

Method used

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  • Method for preparing nanometer flake silver powder through chemical deposition
  • Method for preparing nanometer flake silver powder through chemical deposition
  • Method for preparing nanometer flake silver powder through chemical deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The acrylic resin BR106 with a molecular weight of 40000 was dissolved in the cyclohexanone solution so that the content of the acrylic resin was 15wt%. Then, the resin solution was uniformly coated on the PET substrate by screen printing, baked in an oven at 80 °C for 1 h, and then taken out to obtain a smooth, even and uniform soluble resin layer.

[0031] Hydrophilic and sensitization treatments are carried out before the chemical deposition of the silver film. The PET substrate coated with heat-shrinkable acrylic resin was immersed in a 0.35 mM sodium dodecyl sulfate solution, taken out after 10 min, and rinsed with ultrapure water to make the soluble resin layer hydrophilic. Then the substrate after hydrophilic treatment was immersed in 17.7 mM stannous chloride solution for sensitization, took it out after 10 min, and rinsed with ultrapure water.

[0032] A silver film with nanoscale thickness is deposited on the substrate surface by chemical deposition method. ...

Embodiment 2

[0038] The acrylic resin BR116 with a molecular weight of 60000 was dissolved in a methyl ethyl ketone solution, so that the acrylic resin content was 10 wt %; then the resin solution was evenly coated on the glass substrate by screen printing, and baked in an oven at 80 °C for 1 Take it out after h to obtain a flat, smooth and uniform soluble resin layer.

[0039] The glass substrate coated with the soluble resin layer is successively subjected to hydrophilic and sensitization treatments. Hydrophilic treatment involves immersing the substrate coated with a soluble resin layer into a 0.35 mM sodium dodecyl sulfate solution, taking it out after 5 min, and then rinsing it with ultrapure water. The sensitization treatment is to immerse the hydrophilic treated substrate in a 17.7 mM stannous chloride solution, take it out after 5 min, and then rinse it with ultrapure water.

[0040]Finally, a silver film with a nanoscale thickness is deposited on the surface of the substrate by c...

Embodiment 3

[0047] The acrylic resin BR116 with a molecular weight of 60,000 was dissolved in ethyl acetate, so that the acrylic resin content was 12 wt %; then the resin solution was evenly coated on the stainless steel substrate by screen printing, and baked in an oven at 120 °C Take it out after 1 min to obtain a flat, smooth and uniform soluble resin layer.

[0048] Hydrophilic and sensitized treatment of stainless steel substrate coated with soluble resin. Hydrophilic treatment is to immerse the substrate coated with soluble resin in 0.35 mM sodium dodecyl sulfate solution, take it out after 7 min, and rinse it with ultrapure water. Sensitization treatment is to immerse the substrate in a 17.7 mM stannous chloride solution after hydrophilic treatment, take it out after 7 min, and finally rinse it with ultrapure water.

[0049] A silver film with nanoscale thickness is deposited on the substrate surface after hydrophilic and sensitization treatment by chemical deposition method. The...

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Abstract

The invention discloses a method for preparing nanometer flake silver powder through chemical deposition, which comprises the following steps that firstly, soluble resin is applied to a substrate, then a nanometer silver film is deposited on the substrate through the chemical deposition, an organic solvent is adopted to dissolve the resin layer, the silver film is changed into coarse flake silver powder which is pulverized by a high-energy ultrasonic instrument, and then the nanometer thin flake silver powder is obtained. The obtained nanometer flake silver powder has the characteristics of smooth surface, uniform thickness, controllable granularity and the like. According to the method, the nanometer flake silver powder is prepared on the basis of the chemical deposition, the defects of rough surface, nonuniform thickness and the like of the flake silver powder prepared by using a mechanical ball milling method are overcome, and the method disclosed by the invention can be applied to the industry of electronic paste.

Description

technical field [0001] The invention relates to the field of metal materials and electronic paste, in particular to a preparation method of nano-thick flake silver powder. Background technique [0002] Flake silver powder is widely used in the electronic paste industry as a conductive filler because of its excellent conductivity. It is the main functional material of radio frequency identification, organic light-emitting diodes, solar cells, electronic paper, electronic packaging, hybrid integrated circuits and other electronic components. [0003] The conductive paste prepared from flaky silver powder mostly has surface-to-surface contact between the particles, which has a large contact area, thereby reducing the contact resistance and improving the conductivity of the conductive paste. At the same time, the accumulation of flake silver powder is layer by layer, which not only reduces the thickness of the coating, but also saves the amount of silver, which provides favorab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 陈振兴王君
Owner SUN YAT SEN UNIV
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