Synthesis and magnetic properties of core-shell Fe_(70)Co_(30)@Ag dendritic nanostructures

摘要

Core-shell Fe_(70)Co_(30)@Ag dendritic nanostructures were successfully synthesized via a simple transmetallic redox method at room temperature, employing a mixed Fe_(70)Co_(30) nanoparticles, and AgNO_3 solution. The Fe_(70)Co_(30)@Ag nanostructures demonstrate a leaf like structure with different lengths (100-300 nm) and widths (～50 nm) connected to the main branch which is of several tens of μm long. The Ag coating of thickness ～8nm on Fe_(70)Co_(30) enhances the plasmonic and antioxidation properties of Fe_(70)Co_(30)@Ag core-shell nanostructure. The saturation magnetization (M_S ～62 emu/g) and coercivity (H_C ～144 Oe) at room temperature clearly suggest that the Fe_(70)Co_(30)@Ag nanostructures is protected from the oxidation due to the Ag coating.