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

机译：面向二氧化钛纳米管阵列的量身定制的功能：磁结构相关性的解释

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摘要

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.
机译：二氧化钛纳米管（NTs）的有序阵列被认为是光催化应用（包括水分解）的良好候选者。考虑到这些纳米结构的功能受其形态，电子和晶体结构的影响，对这些特性及其可能的相关性的基本了解可以阐明提高光催化效率的方法。在这项工作中，二氧化钛NTs的有序阵列是通过电化学合成的，并在各种气氛（富氧，缺氧和还原）中进行等时退火处理，以改变其形态，晶体和电子结构。通过表征这些NT，可以发现退火气氛与相应的晶胞体积和微晶尺寸之间存在直接的相关性。此外，观察到NTs的结构与磁响应之间的相关性，揭示了电子结构的变化，例如态密度，这又与二氧化钛的功能催化性能有关。

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  • 来源
    《Journal of Materials Research》 |2013年第10期|1304-1310|共7页
  • 作者

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

  • 作者单位

    Department of Physics, Northeastern University, Boston, Massachusetts 02115;

    Department of Physics, Northeastern University, Boston, Massachusetts 02115;

    Department of Physics, Northeastern University, Boston, Massachusetts 02115;

    Department of Physics, Northeastern University, Boston, Massachusetts 02115;

    Department of Physics, Northeastern University, Boston, Massachusetts 02115;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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