title: Single crystalline magnetite nanotubes.
abstract: 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.
authors.affiliation: Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA.
authors.forename: Zuqin
authors.initials: Z
authors.lastname: Liu
authors.forename: Daihua
authors.initials: D
authors.lastname: Zhang
authors.forename: Song
authors.initials: S
authors.lastname: Han
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Lei
authors.forename: Weigang
authors.initials: W
authors.lastname: Lu
authors.forename: Jiye
authors.initials: J
authors.lastname: Fang
authors.forename: Chongwu
authors.initials: C
authors.lastname: Zhou
mesh_terms: D052203:Ferrosoferric Oxide; D007501:Iron / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D043942:Nanotubes / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
chemical_list: D010087:Oxides; D008277:Magnesium Oxide; D007501:Iron; D052203:Ferrosoferric Oxide