Design of low cost, scalable, and high-performance TiS2 thermoelectric materials via wet ball-milling process

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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 degrees C. Further, we obtain that the prepared TiS2 has as high figure of merit as 0.35 at 100 degrees 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.
Publisher
SPRINGER
Issue Date
2022-04
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, v.33, no.11, pp.8822 - 8832

ISSN
0957-4522
DOI
10.1007/s10854-021-06914-2
URI
http://hdl.handle.net/10203/295204
Appears in Collection
CBE-Journal Papers(저널논문)NE-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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