Mechanochemistry: Fundamentals, applications and future

Mechanochemically driven 3D heterostructuring of metal chalcogenides

Viktor P. Balema ProChem Inc., USA

The presentation discusses generation of 3D-heterostructures with incommensurate arrangements from well-defined building blocks using unconventional synthetic approach, comprising mechanochemically facilitated reshuffling of layered transition-metal dichalcogenides MX 2 [1,2], and non-layered rare-earth metal monochalcogenides REX to form MX 2 /M’X 2 or (REX) n MX 2, nano-assemblies, where M (M’) = W, Mo, Ta, Nb; RE = Sm, and X = S or Se [3]. The discovered solid-state transformations are directed by atomic-scale interaction between chemically and structurally similar or dissimilar solids toward ordering.In the case of the layered MoS 2 and HfS 2 [1], 3D-heterostructuring is energetically favorable over alloying in M'X 2 - MX 2 systems, where M,M' = W, Mo, Ta, Nb, and X = S, or Se [2]. Density-functional theory calculations validated experimental results. The obtained 3D-hetero assemblies demonstrate diverse electron transport behavior, varying from metallic conductivity to indirect band gap semiconductivity, and superconductivity in some misfit heterostructures [1,3,4]. Potential scale up of mechanochemical processes will be discussed as well. References 1. Z. Hlova et al. Nanoscale Adv. (2021),3, 4065 Z. Hlova et al. Chem. Commun. (2018),54,12574 Dolotko et al. Nat. Commun. (2020),11,3005 B. Sreedhara et al. Chem. Mater. (2022), 34, 1838

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© The Author(s), 2022

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