Preparation and Magnetic Properties of Cu-Ni Core-shell Nanowires in Ion-track Templates  

作　　者：陈永辉 DUAN Jinglai YAO Huijun MO Dan WANG Tieshan SUN Youmei 刘杰 

机构地区：[1]Materials Research Center, Institute of Modern Physics, Chinese Academy of Sciences [2]School of Nuclear Science and Technology, Lanzhou University [3]University of Chinese Academy of Sciences

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2015年第4期665-669,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(Nos.11175221,11179003,11005134,11375241,and 11275237);the West Light Foundation of Chinese Academy of Sciences(CAS)

摘　　要：Cu-Ni core-shell nanowires, with an inner Cu core diameter of about 60 nm and varying Ni shell thicknesses （10, 30, 50, 60, and 80 nm）, were successfully fabricated in porous polycarbonate （PC） ion- track templates by a two-step etching and electrodeposition method. In our experiment, the thickness of Ni shell can be effectively tuned through the etching time of templates. The core-shell structure was confirmed by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The X-ray diffraction （XRD） pattern elucidates the co-existence of characteristic peaks for both Cu and Ni, indicating no other phases were formed during preparation. Magnetic hysteresis loops measured via vibrating sample magnetometry （VSM） revealed that Cu-Ni core-shell nanowires with thinner Ni shell exhibited obviously diamagnetic character and together with a weak ferromagnetic activity, whereas ferromagnetic behavior was primarily measured for the wires with thicker Ni shell. With increasing Ni shell thickness, the squareness and coercivity value became smaller due to the shape anisotropy and the formation of multi-domain structure.Cu-Ni core-shell nanowires, with an inner Cu core diameter of about 60 nm and varying Ni shell thicknesses （10, 30, 50, 60, and 80 nm）, were successfully fabricated in porous polycarbonate （PC） ion- track templates by a two-step etching and electrodeposition method. In our experiment, the thickness of Ni shell can be effectively tuned through the etching time of templates. The core-shell structure was confirmed by scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The X-ray diffraction （XRD） pattern elucidates the co-existence of characteristic peaks for both Cu and Ni, indicating no other phases were formed during preparation. Magnetic hysteresis loops measured via vibrating sample magnetometry （VSM） revealed that Cu-Ni core-shell nanowires with thinner Ni shell exhibited obviously diamagnetic character and together with a weak ferromagnetic activity, whereas ferromagnetic behavior was primarily measured for the wires with thicker Ni shell. With increasing Ni shell thickness, the squareness and coercivity value became smaller due to the shape anisotropy and the formation of multi-domain structure.

关 键 词：core-shell nanowires ion track template ETCHING ELECTRODEPOSITION magnetic property 

分 类 号：TB383.1[一般工业技术—材料科学与工程]