Abstract
Thermoelectric (TE) materials could provide an efficient means for recovering waste heat energy if a low cost, scalable, and high figure-of-merit material could be fabricated. Here, we report, for the first time, a wet ball-milling method to achieve high-performance two-dimensional (2D) semi-metallic TiS2 nanoplatelets. TiO2 is milled, annealed, and sintered with sulfur under high pressure. The addition of a small amount of sulfur (S) powder during the annealing period prevents sulfur deficiency in the sintered compact, resulting in the formation of a near-stoichiometric TiS2 composition. The formation of 2D TiS2 nanoplatelets was confirmed by X-ray diffraction, field emission scanning electron microscopy with energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The TE properties were measured in the temperature range of 25–100 °C. Further, we obtain that the prepared TiS2 has as high figure of merit as 0.35 at 100 °C. Novel wet ball mill processing strategies for the development of high-performance 2D materials such as TiS2 make it possible to incorporate these materials for scaled-up device fabrication.
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This work was supported by a grant from the National Research Foundation of Korea funded by the Korean government (MSIP) (NRF-2015R1A5A1036133).
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Veluswamy, P., Subramanian, S., ul Hassan, M. et al. Design of low cost, scalable, and high-performance TiS2 thermoelectric materials via wet ball-milling process. J Mater Sci: Mater Electron 33, 8822–8832 (2022). https://doi.org/10.1007/s10854-021-06914-2
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DOI: https://doi.org/10.1007/s10854-021-06914-2