Synthesis of 3D Printable Cu–Ag Core–Shell Materials: Kinetics of CuO Film Removal

Abstract

In this research, Cu–Ag core–shell particles were synthesized as a functional and 3D printable material. Using the solid–liquid method, Cu–Ag core–shell particles were simply synthesized, and different particle sizes of 100 nm and 2 μm were used to confirm the size effect in the synthesis and reaction control of the Cu–Ag core–shell particles. In addition, highly viscous Cu–Ag core–shell particle paste was also prepared, and its electrical conductivity was measured. As a result, the reaction rate in the case of the 2 μm Cu particles was controlled by film diffusion, whereas for the 100 nm Cu particles, the reaction rate was controlled by CuO film produced before reacting with Ag ions in solution, and limited by chemical reaction control. Through the solid–liquid method, dendrite-shaped Cu–Ag core–shell particles were formed. Also, the electrical conductivity increased with increasing sintering temperature and core–shell particle concentration.