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

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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.

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Acknowledgments

Research supported by the U.S. National Science Foundation under Grant Nos. DMR-0906608 and DMR-0907007. The authors would like to thank B. A. Assaf for useful conversations and T. Hussey for magnetometry assistance.

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Authors and Affiliations

  1. Department of Physics, Northeastern University, Boston, Massachusetts, 02115, USA

    Pegah M. Hosseinpour, Eugen Panaitescu, Don Heiman, Latika Menon & Laura H. Lewis

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  1. Pegah M. Hosseinpour
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  2. Eugen Panaitescu
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  5. Laura H. Lewis
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Correspondence to Pegah M. Hosseinpour or Laura H. Lewis.

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Hosseinpour, P.M., Panaitescu, E., Heiman, D. et al. Toward tailored functionality of titania nanotube arrays: Interpretation of the magnetic-structural correlations. Journal of Materials Research 28, 1304–1310 (2013). https://doi.org/10.1557/jmr.2013.94

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