Preparation And Performance Study Of Metal Electrically Conductive Printing Ink (Cu,Ag And Cu-Ag Core-shell Particles)

Metal conductive ink which is made of conductive material has conductiveproperties so it can be used as printing conductive point or conductive lines. Commonlyused metal conductive ink have gold and silver ink. They have good conductivity andstrong antioxidant capacity, but the disadvantage is their price is so expensive that theycan’t be mass produced in the industrial field. Copper conductive ink is both low cost andgood electrical conductivity, but its oxidation resistance is poor which greatly shorten theservice life of the conductive ink. In order to solve those problems, the copper-silvercore-shell nanoparticles are synthetized which can be widely used in many fields andhave important implications for the application of new materials. This paper synthetizedAg nanoparticles and Cu nanoparticles by chemical reduction and the products aremeasured by kinds of measurement to exploring the best condition of the synthesis. Wealso synthetized copper-silver core-shell nanoparticles by exchanging Ag+ions with Cuatoms. The conductive ink prepared by using the synthesized Cu-Ag core-shell particleshas a good stability and electrical conductivity. The main contents are as follows:Firstly, we synthetized copper nanoparticles, nano silver particles and copper-silvercore-shell nanoparticles by using glucose, hydrazine hydrate, sodium hydrogen phosphateseveral different chemicals as a reducing agent and PVP (polyvinylpyrrolidone) as theprotective agent. We can control chemical reaction conditions such as the addition amount,temperature. The experimental results show that the reducing agent and reactiontemperature has a great influence on the purity of the product, and the quantity of theprotective agent is greatly influence the product particle size and its dispersion.Secondly, the resultant particles are measured by SEM images, XRD analyses andUV–Vis spectra, proving that the silver particles and copper particles not only have highpurity but also were uniform in size and distribution. The silver conductive ink andcopper conductive ink are made by disperseing the products in the mixture of ethanol andglycerol solution. The conductive patterns of the metal conductive ink which can make alamp turn on have a good electrical conductivity after sintering at160oC in Ar condition.The resistivity of silver conductive ink is8.1μ·cm and the resistivity of copperconductive ink is20.5μ·cm after measured using four-point probe method.Thirdly, the Cu-Ag core-shell particles were successfully fabricated in ambientatmosphere by a simple, effective, cheap and straightforward method in which Cunanoparticles were firstly obtained by reducing Cu2+ions using reducing agent, and theAg shell was formed on the surface of Cu nanoparticles by exchanging of Ag+ions withCu atoms. The property of the Cu-Ag core-shell particles obtained was studied in detail.Cu-Ag core-shell particles have been tested that they have a strong inoxidizability and abetter electroconductibility. The measured resistance of the patterns after sintering at160oC in Ar condition was17.97μ·cm. So the Cu-Ag core-shell conductive ink is the bestchoice of the metallic ink.