Abstract
Thermoelectric oxides can provide the advantage of high-temperature stability in oxygen-containing atmospheres. It is known that the incorporation of multiwalled carbon nanotubes (mw-CNT) can change the thermoelectric as well as the structural properties of oxides. Here, we report the influence of mw-CNT on the thermoelectric properties of Al-doped ZnO (AZO). The preparation of the mw-CNT-added AZO was done using an ultrasonic mixing of the starting materials followed by a spark plasma sintering process under vacuum. The Seebeck coefficient S, thermal conductivity λ and electrical conductivity σ were determined in the temperature range between 300 K and 900 K. It was observed that the thermal conductivity is significantly reduced by the incorporation of the mw-CNT. At the same time, the electrical conductivity is increased by a factor of 21 from 8700 S/m to 190,000 S/m. The Power factor \({\rm PF} = S^{2} \sigma\) indicates that the addition of mw-CNT improves the thermoelectric properties of Al doped ZnO in comparison to the reference sample prepared with same process but without mw-CNT.
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Acknowledgement
The work was financially supported within the Project “NOXTHERMO” by the Federal Ministry of Education and Research Germany (03FH003I2).
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Dreßler, C., Löhnert, R., Gonzalez-Julian, J. et al. Effect of Carbon Nanotubes on Thermoelectric Properties in Zn0.98Al0.02O. J. Electron. Mater. 45, 1459–1463 (2016). https://doi.org/10.1007/s11664-015-4070-4
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DOI: https://doi.org/10.1007/s11664-015-4070-4