Two types of 3-d metals nanowires: synthesis, structure and properties

Abstract

Matrix synthesis based on etched-track membranes was used for fabrication of two type of nanowires (NWs) – homogeneous (alloys – Fe-Co and Fe-Ni) and heterogeneous – layered NWs (Ni/Cu and Co/Cu). Parameters of galvanic process and features of electrodeposition were determined. X-ray analysis demonstrated the two-phase structure of alloys with low concentration of Fe and step-type changing of cell-parameter with changing of metals concentration ratio in alloy NWs. Topography of NWs was determined by SEM: NWs’ diameter were higher than pores size due to metal oxidation or expansion. Elemental analysis demonstrated that composition of Fe-Co NWs is equal to composition of electrolyte, while for Fe-Ni Fe concentration in NWs is higher; this difference increases with concentration of Fe. TEM allows to evaluate the length of metal segments in layer NWs, to estimate their concentration (pure Cu and mixed Co or Ni). Magnetic-Force microscopy allows to correspond structure and domain size. External field could change magnetization, but only partly – due to mutual influence of NWs.