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

Michitaka Ohtaki, Kazuhiko Araki

    研究成果: ジャーナルへの寄稿記事

    7 引用 (Scopus)

    抄録

    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.

    元の言語英語
    ページ(範囲)813-816
    ページ数4
    ジャーナルJournal of the Ceramic Society of Japan
    119
    発行部数1395
    DOI
    出版物ステータス出版済み - 1 1 2011

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    Phonon scattering
    Thermoelectric power
    Polymethyl Methacrylate
    Pore structure
    Thermal conductivity
    porosity
    Seebeck coefficient
    augmentation
    voids
    thermal conductivity
    Porous materials
    Porosity
    porous materials
    Seebeck effect
    scattering
    retarding
    electrical resistivity
    Electric Conductivity

    All Science Journal Classification (ASJC) codes

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

    これを引用

    Thermoelectric properties and thermopower enhancement of Al-doped ZnO with nanosized pore structure. / Ohtaki, Michitaka; Araki, Kazuhiko.

    :: Journal of the Ceramic Society of Japan, 巻 119, 番号 1395, 01.01.2011, p. 813-816.

    研究成果: ジャーナルへの寄稿記事

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    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.",
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