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Tunable Synthesis, Characterization and Magnetic Properties of Core–Shell Cu@M (M = Co or Ni) Nanowires.

The ultralong Cu@M (M = Co or Ni) nanowires (NWs) with core–shell structure were fabricated by a simple method by using the prepared Cu NWs as template. The crystal phases of Cu@M (M = Co or Ni) NWs were confirmed by X-ray diffraction (XRD). The morphology and microstructure of NWs were characterized by scanning electro microscopy (SEM) and transmission electro microscopy (TEM). Different diameters of Cu@M (M = Co or Ni) NWs varying from 120 to 550 nm with length about 10 μm were obtained via controlling the amounts of cobalt (nickel) nitrates in the reduction process. The magnetic properties of samples were measured using vibrating sample magnetometer (VSM). Results revealed that Cu NWs has a characteristic of paramagnetism after coating Co or Ni. The coercivity (H(c)) values of Cu@ Ni and Cu@Co NWs were 114.6 and 102.5 Oe, respectively. Possible formation mechanism for Cu@M (M = Co or Ni) NWs was preliminarily proposed.