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Preparation method for flaky nanometer silver powder

A technology of nano-silver powder and flakes, which is applied in the field of preparation of flake nano-silver powders, can solve the problems of cumbersome reaction process, complex reaction operation, and non-single shape, and achieve simple process and equipment, high purity, and single shape Effect

Active Publication Date: 2013-03-20
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Some of the above-mentioned methods for preparing flake nano-silver have cumbersome reaction processes and higher requirements for equipment; some reaction operations are complicated, the reaction conditions are higher, and the reaction time is longer; some also use reagents that pollute the environment; the most important thing is that these methods The obtained flaky nano-silver powder is easy to agglomerate and grow up, and the shape is not single

Method used

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  • Preparation method for flaky nanometer silver powder

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Effect test

Embodiment 1）

[0020] The preparation method of the flaky nano-silver powder of the present embodiment is as follows:

[0021] ①Add 0.20g of silver nitrate and 0.04g of PVP-K30 into 15mL of distilled water, stir and dissolve to obtain a silver nitrate solution containing PVP-K30.

[0022] ② Add 0.40 g of ammonium ferrous sulfate hexahydrate into 15 mL of distilled water, stir and dissolve it sufficiently to obtain ammonium ferrous sulfate solution.

[0023] ③ Slowly add the ferrous ammonium sulfate solution obtained in step ② into the silver nitrate solution containing PVP-K30 obtained in step ①, raise the temperature to 60°C, and keep it warm for 30 minutes.

[0024] ④ After the reaction is over, let it stand for 1 hour, then centrifuge the product, wash the solid product three times with absolute ethanol and distilled water, and finally place it in a vacuum drying oven at a temperature of 80°C to obtain the flake nano silver dust.

[0025] The SEM figure of the flaky nano-silver powder t...

Embodiment 2～ Embodiment 5）

[0027] The preparation method of each embodiment is basically the same as that of Example 1, and the differences are shown in Table 1.

[0028] Table 1

[0029] Example 1 Example 2 Example 3 Example 4 Example 5 silver salt Silver nitrate Silver nitrate Silver nitrate silver sulfate Silver acetate Surfactant PVP-K30 PEG-10000 SDS PVP-K30 CTAB Ferrous salt Ammonium Ferrous Sulfate Hexahydrate Ferrous Sulfate Heptahydrate Ammonium Ferrous Sulfate Hexahydrate Ferrous Sulfate Heptahydrate Ammonium Ferrous Sulfate Hexahydrate

Embodiment 6～ Embodiment 9）

[0031] The preparation method of each embodiment is basically the same as that of Example 1, and the differences are shown in Table 2.

[0032] Table 2

[0033] Example 1 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Silver nitrate 0.20g 0.20g 0.20g 0.20g 2.00g 2.00g 2.00g PVP-K30 0.04g 0.01g 0.02g 0.40g 0.10g 0.04g 0.40g Ammonium Ferrous Sulfate Hexahydrate 0.40g 0.80g 0.20g 0.10g 2.00g 4.00g 7.00g temperature reflex 60℃ 40℃ 20℃ 50℃ 80℃ 0℃ 60℃ Reaction time 30min 28min 35min 30min 32min 25min 30min

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Abstract

The invention discloses a preparation method for flaky nanometer silver powder. The flaky nanometer silver powder is prepared by performing reaction on a surfactant-containing aqueous solution of silver salt and a solution of ferrous salt at temperature of 0 to 100 DEG C, wherein the silver salt is silver nitrate, silver sulfate or silver acetate; a surfactant is polyvinylpyrrolidone, hexadecyl trimethyl ammonium bromide, sodium dodecyl sulfate or polyethylene glycol; the ferrous salt is ammonium ferrous sulfate or ferrous sulfate; the weight ratio of the silver salt to the ferrous salt is 2:1 to 1:4; and the weight ratio of the silver salt to the surfactant is 50:1 to 1:2. The flaky nanometer silver powder finally obtained by the method has an undiversified shape and high purity. The method also has the advantages of short reaction time, high efficiency, mild reaction conditions, simple process and equipment, low production cost, convenience for operation, no pollution and the like, and is particularly suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing metal powder, in particular to a method for preparing flaky nano-silver powder. Background technique [0002] Due to its relatively large surface area, flake nano-silver powder has surface or line contact between particles, so the resistance is relatively low and the conductivity is good. In addition, the special surface plasmon resonance properties of flake nano-silver powder make it exhibit completely different optical properties from spherical particles and bulk materials. Therefore, flake nano-silver powder has great application value in the fields of microelectronics, catalysis, surface-enhanced Raman, metal-enhanced fluorescence, infrared hyperthermia, biomarkers, nano-conductive adhesives, and electronic packaging materials. [0003] The preparation methods of flake nano-silver powder mainly include reduction ball milling method, solution reduction method, light induction method, thermal conversio...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 李中春
Owner JIANGSU UNIV OF TECH
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