Sintering and Electrical Properties of Monodispersed Silver Particles Prepared through Wet Chemical Reduction Method

Abstract

Monodispersed silver particles were prepared through wet chemical reduction method. As prepared silver particles had uniform polyhedron morphology with narrow size distribution. Powder X ray diffraction analysis showed that the silver powders had high crystallinity. The particle size of silver powders was controlled by adjusting the concentration of starting reagents and temperature. In a wet chemical reduction reaction, monodispersed silver particles were formed when the molar ratio of reducing agent and silver nitrate was 0.5. It was possible to control the particle size from 120 nm to 800 nm by adjusting the concentration of silver nitrate. The particle size of silver powders decreased to 70 nm with increasing the concentration of gum Arabic. Thermal mechanical measurement showed that the shrinkage of silver paste was 25 at 900. Electrical measurements revealed that the speci c resistivity of the silver paste sintered at 900 for 10 min was 1.81 × 10 −8 Ω m. It was expected that the silver powders exhibited excellent electrical property as electrode materials for integrated circuits, multilayer ceramic capacitor and solar cells etc.