Preparation and characterization of Fe3O4/Ag composite magnetic nanoparticles

Abstract

Fe₃O₄ magnetic nanoparticles being used as seeding materials, Ag⁺ ions on the Fe₃O₄ magnetic nanoparticles reduced to the metal form by tartaric acid using heated treatment. Thus, Fe₃O₄/Ag composite core-shell magnetic nanoparticles were synthesized. The products were characterized by transmission electron microscope (TEM) and x-ray diffraction (XRD). Both TEM and XRD results showed that the Ag nanoparticles were well distributed on the surface of Fe₃O₄ magnetic nanoparticles. The size for Fe₃O₄/Ag composite magnetic nanoparticles which were spherical shape was ≃40 nm. Furthermore, the magnetic properties of samples were characterized on a vibrating sample magnetometer. Under optimal conditions, Fe₃O₄/Ag composite nanoparticles showed higher magnetism than pure Fe₃O₄ nanoparticles.