Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods

Kenji Sugiura, Hiromichi Ohta, Kenji Nomura, Tomohiro Saito, Yuichi Ikuhara, Masahiro Hirano, Hideo Hosono, Kunihito Koumoto

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Epitaxial film of a layered cobalt oxide, Ca3Co 4O9, was fabricated on a (0001)-face of α-Al 2O3 substrate by a topotactic ion exchange method using a Na0.8CoO2 epitaxial film as a precursor. High-resolution X-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca3Co4O9 with stepped & terraced surface morphology. The film exhibits a high electrical conductivity of 2.95 × 102 Scm-1 and a large Seebeck coefficient of ∼+125 μVK-1, which leads to the thermoelectric power factor of 4.5 × 10-4 Wm-1K -2 at 300 K.

    Original languageEnglish
    Title of host publicationProceedings ICT'06 - 25th International Conference on Thermoelectrics
    Pages99-102
    Number of pages4
    DOIs
    Publication statusPublished - 2006 Dec 1
    EventICT'06 - 25th International Conference on Thermoelectrics - Vienna, Austria
    Duration: 2006 Aug 62006 Aug 10

    Publication series

    NameInternational Conference on Thermoelectrics, ICT, Proceedings

    Other

    OtherICT'06 - 25th International Conference on Thermoelectrics
    CountryAustria
    CityVienna
    Period06/8/606/8/10

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Sugiura, K., Ohta, H., Nomura, K., Saito, T., Ikuhara, Y., Hirano, M., Hosono, H., & Koumoto, K. (2006). Thermoelectric properties of epitaxial films of layered cobalt oxides fabricated by topotactic ion-exchange methods. In Proceedings ICT'06 - 25th International Conference on Thermoelectrics (pp. 99-102). [4133246] (International Conference on Thermoelectrics, ICT, Proceedings). https://doi.org/10.1109/ICT.2006.331290