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Ferromagnetism of Co-doped TiO2(B) nanotubes

Wang, X. W. , Gao, Xueping , Li, G. R. , Gao, L. , Yan, T. Y. , & Zhu, Huai Yong (2007) Ferromagnetism of Co-doped TiO2(B) nanotubes. Applied Physics Letters, 91(14), pp. 143102-1.

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Abstract

The Co-doped titanate nanotubes, synthesized via a hydrothermal reaction, are calcined at 300, 400, and 500 degrees Celsius for 2 h in an argon atmosphere to yield Co-doped TiO2(B) nanotubes and anatase nanotubes with a dark gray color. It is shown that all calcined titania nanotubes have a stronger absorption in visible region, attributed to the formation of oxygen vacancies. The saturation magnetization of all Co-doped titania nanotubes is stronger than that of as-prepared Co-doped titanate nanotubes. In particular, Co-doped TiO2(B) nanotubes calcined at 300 degrees Celsius exhibit the strongest ferromagnetism due to the existence of oxygen vacancies, as confirmed further by electron paramagnetic resonance spectra.

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23 citations in Scopus
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22 citations in Web of Science®

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ID Code: 15052
Item Type: Journal Article
Keywords: calcination, cobalt, crystal growth from solution, ferromagnetism, magnetisation, nanotechnology, nanotubes, paramagnetic resonance, semiconductor materials, titanium compounds, vacancies (crystal), visible spectra
DOI: 10.1063/1.2789734
ISSN: 0003-6951
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Transition Metal Chemistry (030207)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200) > Solid State Chemistry (030206)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2007 American Institute of Physics
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 08 Oct 2008
Last Modified: 25 Feb 2013 12:50

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