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Thermoelectric Properties of Bi2Te3 Nanocrystals with Diverse Morphologies Obtained via Modified Hydrothermal Method

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Abstract

Single-phase Bi2Te3 nanostructures (spherical and flower-like) have been synthesized using a modified hydrothermal method at different reaction temperatures (70°C, 100°C, and 150°C) and subsequently consolidated by spark plasma sintering. Their crystal structure, morphology, and thermoelectric and mechanical properties were investigated. The results suggest that the reaction temperature had a significant effect on the morphology and thermoelectric properties. The presence of nanostructures in bulk samples led to a remarkable decrease in thermal conductivity with a lesser effect on electrical conductivity. As a result, the figure␣of merit (ZT) of the spark-plasma-sintered sample processed from spherical nanoparticles reached 0.54 at 400 K. The Vickers microhardness of the bulk sample processed from spherical nanoparticles was higher than the best results found in literature.

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Acknowledgement

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (NRF-2015R1D1A1A09060920).

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Kongju National University, 275, Budae-dong, Cheonan City, Chungcheongnam-do, 330-717, Republic of Korea

    Peyala Dharmaiah & Soon-Jik Hong

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  1. Peyala Dharmaiah
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  2. Soon-Jik Hong
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Correspondence to Soon-Jik Hong.

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Dharmaiah, P., Hong, SJ. Thermoelectric Properties of Bi2Te3 Nanocrystals with Diverse Morphologies Obtained via Modified Hydrothermal Method. J. Electron. Mater. 46, 3012–3019 (2017). https://doi.org/10.1007/s11664-016-5104-2

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  • DOI: https://doi.org/10.1007/s11664-016-5104-2

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