Method for electrochemically aided preparation of silver powder with special form

Abstract

The invention provides a method for electrochemically aided preparation of silver powder with a special form. According to the invention, carbonic or metallic electrodes are used as a working electrode and a counter electrode; after cleaning with ultrasonic wave, the working electrode and the counter electrode are immersed into a solution or sol containing silver ions prepared by using ultra pure deionized water; the working electrode is used as a cathode, the counter electrode is used as an anode, and an electrochemical reaction is carried out under an air-tight condition and the condition of a constant current; after the reaction, a resultant is separated and dried to obtain nanometer silver powder. Through control of the variety of electrodes, the amount of current flowing and the variety of electrolytes, dendritic nanometer silver powder, flake nanometer silver powder, laminated flake nanometer silver powder, fibrous nanometer silver powder, cubic cage nanometer silver powder and tetrahedron cubic cage nanometer silver powder can be prepared. The method provided in the invention enables form control and continuous preparation of nanometer silver particles to be realized without addition of any other chemical reagents; the method has the advantages of a simple process, a widely applicable product, high yield of the powder, greenness, environmental protection and feasibility in industrial production.

Description

technical field [0001] The invention relates to a method for assisting preparation of nano-silver powder with a special shape by an electrochemical reduction method. Background technique [0002] In recent years, nanostructures of noble metal particles have attracted increasing attention due to their superior chemical, electronic, magnetic, optical, thermal, and catalytic properties. As a functional material, nano-silver powder is widely used in the electronics industry, mainly for the manufacture of silver-containing conductive pastes, electrodes for certain electronic devices and high-grade alkaline zinc-silver storage batteries. In today's rapidly developing microelectronics industry, the market demand for high-purity nano-silver powder is also increasing significantly. At the same time, nano-silver particles are also excellent biological materials and environmental materials, which are non-toxic to the human body and have the characteristics of high-efficiency steriliza...

AI Technical Summary

Problems solved by technology

The process of preparing nano-silver powder by chemical method is complex, the cycle is long, the process is difficult, and the shape of silver powder is difficult to control

Preparation of nano-silver particles by physical methods such as vacuum evaporation, high-energy beam bombardment evaporation, etc., the yield of silver powder is low

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