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The Effect of Reactive Electric Field-Assisted Sintering of MoS<sub>2</sub>/Bi<sub>2</sub>Te<sub>3</sub> Heterostructure on the Phase Integrity of Bi<sub>2</sub>Te<sub>3</sub> Matrix and the Thermoelectric Properties
oleh: Yanan Wang, Cédric Bourgès, Ralph Rajamathi, C. Nethravathi, Michael Rajamathi, Takao Mori
Format: | Article |
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Diterbitkan: | MDPI AG 2021-12-01 |
Deskripsi
In this work, a series of Bi<sub>2</sub>Te<sub>3</sub>/X mol% MoS<sub>2</sub> (X = 0, 25, 50, 75) bulk nanocomposites were prepared by hydrothermal reaction followed by reactive spark plasma sintering (SPS). X-ray diffraction analysis (XRD) indicates that the native nanopowders, comprising of Bi<sub>2</sub>Te<sub>3</sub>/MoS<sub>2</sub> heterostructure, are highly reactive during the electric field-assisted sintering by SPS. The nano-sized MoS<sub>2</sub> particles react with the Bi<sub>2</sub>Te<sub>3</sub> plates matrix forming a mixed-anion compound, Bi<sub>2</sub>Te<sub>2</sub>S, at the interface between the nanoplates. The transport properties characterizations revealed a significant influence of the nanocomposite structure formation on the native electrical conductivity, Seebeck coefficient, and thermal conductivity of the initial Bi<sub>2</sub>Te<sub>3</sub> matrix. As a result, enhanced <i>ZT</i> values have been obtained in Bi<sub>2</sub>Te<sub>3</sub>/25 mol% MoS<sub>2</sub> over the temperature range of 300–475 K induced mainly by a significant increase in the electrical conductivity.