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Thermoelectric Properties of Ni-doped ZnO Synthesized by Sol-Gel Processing

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Author(s): WU Zi-Hua, XIE Hua-Qing, ZENG Qing-Feng

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 28;
Issue: 9;
Start page: 921;
Date: 2013;
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Keywords: ZnO | thermoelectric property | Sol-Gel | thermal conductivity

ABSTRACT
Zn1-xNixO nanoparticles were prepared by Sol-Gel processing. Scanning electron microscope observations indicated that nanoparticles were mainly flake structure with many honeycombed passages on the surface of nanoparticles. For the sintered samples, the solubility limit of Ni in the Zn1-xNixO wurtzite structure was found to be 0.05. All doped samples showed n-type semiconducting conductivity. The increase of x led to a significant decrease in absolute value of Seebeck coefficient (|S|). Over the entire temperature range, the thermal conductivity of Zn1-xNixO samples was much lower than that of bulk ZnO sample. The highest ZT (0.045) was obtained for Zn0.925Ni0.075O at 750 K.
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