Effects of morphology on the thermoelectric properties of Al-doped ZnO

Li Han, Ngo Van Nong, Wei Zhang, Le Thanh Hung, Tim Holgate, Kazunari Tashiro, Michitaka Ohtaki, Nini Pryds, Søren Linderoth

    Research output: Contribution to journalArticlepeer-review

    51 Citations (Scopus)

    Abstract

    The nanoparticles of Al-doped ZnO were successfully grown into rod-like and platelet-like morphologies by soft chemical routes. These powders were consolidated using spark plasma sintering (SPS) technique. The samples consolidated from rods and platelets exhibited characteristic structures with preferential orientation while the sample consolidated from nanoparticles did not show any sign of preferential orientation. The measured ZT values along the preferred orientation directions were found to be 0.16 and 0.25 at 1223 K for the samples consolidated from rods and platelets, respectively. The sample consolidated from nanoparticles exhibited fine grains and highly distributed nanoprecipitates, resulting in a ZT value of 0.3 at 1223 K due to the lower thermal conductivity resulting from nanostructuring. Using the simple parabolic band model and Debye-Callaway thermal transport model, the anisotropic properties of the nanostructured samples were elucidated and the influence of the grain size and nanoprecipitates on the electron and phonon transport was analyzed and discussed in detail.

    Original languageEnglish
    Pages (from-to)12353-12361
    Number of pages9
    JournalRSC Advances
    Volume4
    Issue number24
    DOIs
    Publication statusPublished - 2014

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)

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