SYNTHESIS OF SILVER PLATING NANO-COPPER BIMETALLIC POWDERS

摘要

The silver plating nona-copper bimetallic powders were synthesized by substitution reaction method and chemical deposition method with AgNCh as main salt. Transmission electron microscopy (TEM) and Energy Dispersive Spectrometer (EDS) were used to characterize the as-prepared bimetallic powders. Three kinds of preparation processes (direct substitution reaction with AgNC>3, substitution reaction method with [Ag(NH3)]~(~(~(2+))) and chemical deposition method ) were compared with each other. The experimental results indicate that the silver plating nano-copper bimetallic powders can be synthesized by direct substitution reaction method with relatively simple procedure. The silver content on the surface of the bimetallic powders prepared by direct substitution reaction can reach 74.78 at%. The silver content on the powders prepared with [Ag(NH3)]~(~(~(2+))) after depositing once and twice are 35.46 at% and 70.16 at% , respectively. The bimetallic powders synthesized by chemical deposition method show a mixture structure with nano-copper and nano-silver powders rather than silver plating nano-copper structure.