Issue 6, 2023

Halide-driven polymorph selectivity in the synthesis of MnX (X = S, Se) nanoparticles

Abstract

Devising synthetic strategies to control crystal structure is of great importance as materials properties are governed by structure. MnS is a great model system as it has three known stable polymorphs. Herein, we show the selective synthesis of colloidal wurtzite- and rock-salt-type MnS under identical reactions conditions changing only the manganese halide precursor. Mixtures of Mn halides or halide surrogate (e.g., NH4Cl) also enabled polymorph control. Powder X-ray diffraction aliquot studies of the reactions revealed the crystal structure at the onset of nucleation and that of the final product is the same, unlike the Ostwald ripening transformation observed in other systems. The halide-driven selectivity was also observed in the synthesis of manganese selenide nanoparticles. In this system, variation of the Mn halide precursor allowed access to the wurtzite- and rock salt-type polymorphs of MnSe, as well as the pyrite-MnSe2 phase. Based on this work, the mixing of metal salts might be a simple and effective strategy towards polymorph control and access materials with new crystal structures.

Graphical abstract: Halide-driven polymorph selectivity in the synthesis of MnX (X = S, Se) nanoparticles

Supplementary files

Article information

Article type
Paper
Submitted
21 10 2022
Accepted
12 1 2023
First published
17 1 2023

Nanoscale, 2023,15, 2650-2658

Halide-driven polymorph selectivity in the synthesis of MnX (X = S, Se) nanoparticles

D. Gendler, J. Bi, D. Mekan, A. Warokomski, C. Armstrong and E. A. Hernandez-Pagan, Nanoscale, 2023, 15, 2650 DOI: 10.1039/D2NR05854E

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