Thermoelectric properties and thermopower enhancement of Al-doped ZnO with nanosized pore structure

Michitaka Ohtaki, Kazuhiko Araki

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Thermoelectric properties of Al-doped ZnO (Zn0.98Al 0.02O) with nanosized pore (nanovoid) structure were investigated. Nanovoids were formed by using monodisperse polymethylmethacrylate (PMMA) particles of 150, 425, and 1800nm in average diameter as a void forming agent (VFA). Whereas the thermal conductivity of the samples sintered with the 150nm PMMA particles of 510 wt% was efficiently suppressed, the magnitude of the suppression was almost the same as that of the electrical conductivity, revealing that the selective phonon scattering was failed in these samples. However, being helped by the contribution from an enhancement in the Seebeck coefficient, the samples sintered with 510 wt% of 150nm VFA successfully attained the ZT values of 0.55-0.57 at 1000°C. Furthermore, the reduction of the thermal conductivity with increasing porosity was much steeper than ordinary porous materials, suggesting significantly stronger phonon scattering by the nanosized pore structure.

    Original languageEnglish
    Pages (from-to)813-816
    Number of pages4
    JournalJournal of the Ceramic Society of Japan
    Volume119
    Issue number1395
    DOIs
    Publication statusPublished - Nov 2011

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

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