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Synthesis, structure, and magnetic properties of iron-oxide nanowires

Published online by Cambridge University Press:  03 March 2011

Matej Pregelj ,
Polona Umek ,
Boštjan Drolc ,
Boštjan Jančar ,
Zvonko Jagličič ,
Robert Dominko  and
Denis Arčon
Matej Pregelj*
Affiliation:
Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia
Polona Umek
Affiliation:
Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia
Boštjan Drolc
Affiliation:
Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia
Boštjan Jančar
Affiliation:
Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia
Zvonko Jagličič
Affiliation:
Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia
Robert Dominko
Affiliation:
National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
Denis Arčon
Affiliation:
Institute Jožef Stefan, Jamova 39, 1000 Ljubljana, Slovenia; and Faculty of Mathematics and Physics, Jadranska 19, University of Ljubljana, 1000 Ljubljana, Slovenia
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Iron-oxide nanowires were synthesized by a hydrothermal treatment of Fe(OH)3 dispersion in NaOH. The obtained materials were first structurally investigated by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and thermogravimetric analysis techniques. Their magnetic properties were then examined by superconducting quantum interference device and electron paramagnetic resonance methods. A typical nanowire measured 10–15 nm in diameter and 600 nm in length. All the structural and magnetic investigations were consistent with the nanowire goethite structure. The nanowire Neél transition temperature occurred at 375 K; i.e., it was lowered by 25 K with respect to the corresponding goethite bulk value. The shift in the ordering temperature was suggested to be a consequence of a growing importance of strains and surface effects at the nanoscale. We were also able to irreversibly convert goethite nanowires into hematite, by warming the sample to temperatures exceeding 530 K.

Keywords

FeMagneticNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 11 , November 2006 , pp. 2955 - 2962
Copyright
Copyright © Materials Research Society 2006

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