Seyed Abolghasem Kahani Seyed Abolghasem Kahani Preparation of bimetallic Co–Ag and Co–Cu nanoparticles by transmetallation of tetrakis (pyridine) silver (II) peroxydisulfate and tetrakis (pyridine) sulfatocopper (II) monohydrate complexes

چکیده مقاله

Co–Cu and Co–Ag bimetallic nanocrystallites were prepared by transmetallation of tetrakis(pyridine)silver(II) peroxydisulfate and tetrakis(pyridine)sulfatocopper(II) monohydrate complexes by metallic cobalt nanoparticles. In this work, cobalt nanoparticles were reacted as a reducing agent in a chemical reduction of metal complexes. Due to the complex formation constant and the reduction potential of AgII and CuII complexes, bimetallic Co–Ag and Co–Cu nanoparticles in aqueous solution are formed. These nanoparticles were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and EDX analysis. The percentages of phases were calculated by the Rietveld method. Besides, strain and crystals size were calculated by the Williamson–Hall method and the profile coefficients were obtained in the GSAS softwar