Ternary transition metal sulfides with the general formula (AE)MIVS3 (AE = Ca, Sr, Ba; M = Zr, Ti, Hf) have recently drawn increasing attention because of their optical, electronic, and thermal properties, with possible applications including photovoltaic absorbers and NIR detectors. However, synthetic routes to these materials, especially as nanomaterials, remain limited. We have recently developed solution synthesis routes to colloidal nanocrystals of BaTiS3 using several different methods at readily accessible temperatures. The size and shape of the nanocrystals are tunable through variation of the synthetic conditions. Structural data (powder X-ray diffraction) shows the hallmarks of a composite crystal correlated with deviations from the ideal stoichiometry. The BaTiS3 nanorods show a strong and tunable NIR absorbance (~0. 8 eV) whose energy is correlated to the nanorod structure and stoichiometry; investigations into the origin of this feature will be discussed. Progress in extending these results to other related materials including the chalcogenide perovskites such as BaZrS3 will be discussed.

Shape-controlled synthesis of colloidal nanorods and naoparticles of ternary alkaline earth metal/Group 4 transition metal sulfides

ACS Fall 2021

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