Using the copper powders as the substrate, the silver nitrate as the silver resource, PVP as the dispersant and 1,4-butylene glycol as the leveling agent, silver coated copper powders were prepared by in-situ reduction method in ethylene diamine tetraacetic acid(EDTA)-Ag(I)-Cu(II)-H_2O system. The products were systematically characterized by using scanning electron microscopy(SEM), X-ray diffraction meter(XRD), optical lens spherical aberration correction field emission transmission electron microscopy(STE...