Influence of supercritical drying on thermoelectric properties of Zinc Oxide

DOI IR (HANDLE) Open Access
  • Klich Wojciech Jacek
    Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University
  • Ohtaki Michitaka
    Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University

Description

Effect of supercritical drying on thermoelectric performance of aluminum doped zinc oxide is investigated. Oxide gels were obtained by sol-gel processing of alcoholic zinc nitrate solution, with addition of propylene oxide as a gelation agent. The gels then were processed and dried in supercritical ethanol conditions (“A-gel” powders) or left for slow evaporation in ambient conditions (“X-gel” powders). Powders were sintered using spark plasma sintering (SPS) method. On sintered samples, the electric conductivity, the Seebeck coefficient and the thermal conductivity were measured. Distinct difference in morphology of two types of the samples was studied with SEM. The samples prepared with supercritical method exhibited up to 45% lower thermal conductivity in low temperature region. Metallic-like behavior of the electrical conductivity as observed on A-gel samples. As a consequence of good electrical properties and lowered thermal conductivity, A-gels had better result of thermoelectric efficiency (ZT). The largest dimensionless figureof-merit ZT = 0.10 was obtained for the A-gel sample.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390290699823941248
  • NII Article ID
    120006695710
  • DOI
    10.15017/1961291
  • ISSN
    24341436
  • HANDLE
    2324/1961291
  • Text Lang
    en
  • Article Type
    conference paper
  • Data Source
    • JaLC
    • IRDB
    • CiNii Articles
  • Abstract License Flag
    Allowed

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