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Toward tailored functionality of titania nanotube arrays: Interpretation of the magnetic-structural correlations

Published online by Cambridge University Press:  09 May 2013

Pegah M. Hosseinpour ,
Eugen Panaitescu ,
Don Heiman ,
Latika Menon  and
Laura H. Lewis
Pegah M. Hosseinpour*
Affiliation:
Department of Physics, Northeastern University, Boston, Massachusetts 02115
Eugen Panaitescu
Affiliation:
Department of Physics, Northeastern University, Boston, Massachusetts 02115
Don Heiman
Affiliation:
Department of Physics, Northeastern University, Boston, Massachusetts 02115
Latika Menon
Affiliation:
Department of Physics, Northeastern University, Boston, Massachusetts 02115
Laura H. Lewis*
Affiliation:
Department of Physics, Northeastern University, Boston, Massachusetts 02115
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Ordered arrays of titania nanotubes (NTs) are considered as good candidates for photocatalytic applications including water splitting. Considering that the functionality of these nanostructures is influenced by their morphology, electronic and the crystallographic structure, fundamental understanding of these properties and their possible correlations can clarify the approaches toward enhanced photocatalytic efficiency. In this work, ordered arrays of titania NTs are synthesized electrochemically and are subjected to isochronal annealing treatments in various atmospheres (oxygen-rich, oxygen-deficient and reducing) to modify their morphology, crystal and electronic structure. Upon characterization of these NTs, direct correlations are found between the annealing atmosphere and the corresponding unit cell volume and the crystallite size. Furthermore, correlations between the NTs’ structure and magnetic response are observed, revealing changes in the electronic structure such as the density of states, that are in turn relevant to the functional catalytic properties of titania.

Keywords

nanostructuremagnetic propertiescrystallographic structure
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 10 , 28 May 2013 , pp. 1304 - 1310
Copyright
Copyright © Materials Research Society 2013 

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References

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