Nano silver-coated copper powder and preparation method and application thereof

Abstract

The invention discloses nano silver-coated copper powder and a preparation method and application thereof. A copper sulfate solution or a copper nitrate solution is mixed with a complexing agent to prepare a complexing copper solution, an alkaline solution is mixed with sodium borohydride and a dispersing agent to obtain a reducing solution, nitrogen is introduced to the reducing agent to remove air, and then the complexing copper solution is added to obtain nano-copper sol; a sulfuric acid solution is added to the nano-copper sol to react with excess sodium borohydride, then the pH is adjusted to 6-7.5 with the alkaline solution so as to obtain a nano-copper sol dispersing solution, then a silver nitrate solution is added to react to obtain a nano-silver coated copper dispersing solution, and after separation, the nano silver-coated copper powder is obtained. The nano silver-coated copper powder prepared according to the invention is core-shell structure nano particles with particle size conforming to ink-jet printing requirement, is low in cost and simple and easy in preparation method, can be used as a conducting material of conducting ink for ink jet printing, and has the advantages of being good in conducting performance and low in cost.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to nanometer silver-coated copper powder, its preparation method and application. technical background [0002] In recent years, printed electronics have been widely used in radio frequency identification (RFID) tags, solar thin-film batteries, transistors, sensors, flexible electronic devices and other fields, and new precision manufacturing technologies such as inkjet printing for precision processing of electronic conductive patterns are becoming more and more more important. [0003] High-performance printed conductive inks used in inkjet printing have high requirements on the particle size and conductivity of conductive fillers. At present, metal conductive materials such as silver nanoparticles are mainly used to obtain printed conductive inks, and inkjet printing direct imaging technology using this ink has been widely used. Patent application CN201110308119.1 pre...

AI Technical Summary

Problems solved by technology

Patent application CN201110308119.1 prepare silver acetate and organic protective agent into toluene solution, add phenylhydrazine toluene solution to obtain nano-silver particles with a particle size of less than 10nm that meet the requirements of inkjet printing; patent application CN201110261814.7 combine silver nitrate and organic protective agent Soluble in isopropanol and add sodium borohydride in isopropanol solution to obtain nano silver particles with a particle size of less than 50nm that meet the requirements of inkjet printing, but the existing silver nano particle materials have the defects of high cost and complicated preparation process

[0004] Since copper is cheaper than silver, the conductivity is higher, but the oxidation of copper will increase the resistivity of the conductive pattern

In order to solve the cost problem of conductive filler silver and the problem of copper oxidation, Cu@Ag core-shell nanoparticles have attracted attention in recent years, but there are few research reports on silver-coated copper nanoparticles that meet the requirements of inkjet printing.

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