Premium
Facile Synthesis of Bimetallic Ag/Ni Core/Sheath Nanowires and Their Magnetic and Electrical Properties
Author(s) -
McKiernan Maureen,
Zeng Jie,
Ferdous Sunzida,
Verhaverbeke Steven,
Leschkies Kurtis S.,
Gouk Roman,
Lazik Christopher,
Jin Miao,
Briseno Alejandro L.,
Xia Younan
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201000801
Subject(s) - nanowire , materials science , crystallite , ferromagnetism , spintronics , bimetallic strip , electrical resistivity and conductivity , magnetization , nanotechnology , condensed matter physics , magnetic field , metallurgy , metal , physics , electrical engineering , engineering , quantum mechanics
This paper describes a facile method for coating Ag nanowires with uniform, ferromagnetic sheaths made of polycrystalline Ni. A typical sample of these core/sheath nanowires had a saturation magnetization around 33 emu g −1 . We also demonstrated the use of this magnetic property to align the nanowires by simply placing a suspension of the nanowires on a substrate in a magnetic field and allowing the solvent to evaporate. The electrical conductivity of these core/sheath nanowires (2 × 10 3 S cm −1 ) was two orders of magnitude lower than that of bulk Ag (6.3 × 10 5 S cm −1 ) and Ni (1.4 × 10 5 S cm −1 ). This is likely caused by the transfer of electrons from the Ag core to the Ni sheath due to the difference in work function between the two metals. The electrons are expected to experience an increased resistance due to spin‐dependent scattering caused by the randomized magnetic domains in the polycrystalline, ferromagnetic Ni sheath. Studies on the structural changes to the Ni coating over time under different storage conditions show that storage of the nanowires on a substrate under ambient conditions leads to very little Ni oxidation after 6 months. These Ag/Ni core/sheath nanowires show promise in areas such as electronics, spintronics, and displays.