Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.111
Publication date: 22nd December 2022
Crystal structure plays a central role in the properties exhibited by a material. As such, intense research efforts are focused on polymorph selectivity during materials synthesis in the nano and bulk scales. The MnS system, having three known polymorphs, has received considerable attention towards developing a better understanding of factors that control crystal structure selectivity. The three polymorphs are metastable zincblende- and wurtzite-MnS, with rock salt-MnS as the thermodynamic product. In addition, MnS is an Earth-abundant semiconductor with potential applications that include photovoltaics, batteries, and opto-electronics. This talk focuses on the halide-driven polymorph selectivity of MnS nanoparticles. Specifically, we show that the product can be tuned between the wurtzite and rock salt structures by varying the Mn halide precursor, under otherwise identical conditions. Temperature and aliquot studies were employed to obtain insights into the reaction pathway. The synthesized particles were characterized with powder X-ray diffraction, Transmission Electron Microscopy (TEM) and high-resolution TEM. This halide-driven selectivity can also be extended to the MnSe system.
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