Single crystalline magnetite nanotubes.
We descried a method to synthesize single crystalline Fe3O4 nanotubes by wet-etching the MgO inner cores of MgO/Fe3O4 core-shell nanowires. Homogeneous Fe3O4 nanotubes with controllable length, diameter, and wall thickness have been obtained. Resistivity of the Fe3O4 nanotubes was estimated to be approximately 4 x 10-2 Omega cm at room temperature. Magnetoresistance of approximately 1% was observed at T = 77 K when a magnetic field of B = 0.7 T was applied. The synthetic strategy presented here may be extended to a variety of materials such as YBCO, PZT, and LCMO which should provide ideal candidates for fundamental studies of superconductivity, piezoelectricity, and ferromagnetism in nanoscale structures.
Liu
Zuqin
Z
Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA.
Zhang
Daihua
D
Han
Song
S
Li
Chao
C
Lei
Bo
B
Lu
Weigang
W
Fang
Jiye
J
Zhou
Chongwu
C
D052203:Ferrosoferric Oxide; D007501:Iron / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
D010087:Oxides; D008277:Magnesium Oxide; D007501:Iron; D052203:Ferrosoferric Oxide