The Preparation Of One-dimensional Core-shell Nanowire Array And The Research Of Its Microstructure And Property

Core-shell nanowire consists of core material and shell material,two kinds of material decided the special structure of core-shell nanowires.Core-shell nanowires have attracted significant interest because of their important applications in the fields of solar cells,chemical sensors,bioseparations,drug delivery and vertical recording.However,the synthesis of core-shell nanowires by controllable way over the geometrical and morphological characteristics still remain a huge challenge due to their relatively complex structure,thus preventing a further study on their properties.The preparations of nanowires include vapor method,liquid method and template method,etc.Template method has become an important way of preparing nanowires because of its simplicity,uniform hole diameter and highly ordered distribution.In this work,Cu and Cu/CuO nanowires array were electrodeposited in anodic aluminum oxide(AAO)templates,employed with chemical enlarge hole and oxidation.Then Ni,Co shells were deposited on the core nanowires,finally Cu/Ni、Cu/CuO/Ni、Cu/Co、Cu/CuO/Co core-shell nanowires array were fabricated.This dissertation studied the morphologies and structures of nanowires by means of X-ray diffraction,scanning electron microscopy and transmission electron microscopy.We also studied the magnetic properties and the electrochemical properties of the nanowires by means of vibrating sample magnetometer and electrochemical workstation.Results are as follows: 1.we successfully fabricated the core-shell nanowires with uniform size and large aspect ratio.Core nanowires were polycrystalline structures with large grain and they had a smooth surface;obvious core-shell structure could be seen in the core-shell nanowires,shell were polycrystalline structures with small grain and they had a coarse surface.2.Nanowires possess clearly magnetic anisotropy due to their shape anisotropies,and the easy axes of magnetization was found to be parallel to the axes of nanowires.the remanence ratio and coercivity values of core-shell nanowires were smaller than pure shell nanowires due to the shape anisotropy and the formation of multi-domain structure.3.Ni nanowires were an order of magnitude higher than bulk Ni in electrochemical activity aspect.The electrochemical activity of Cu/Ni,Cu/CuO/Ni core-shell nanowires was higher than pure Ni nanowires.