ProChem’s CTO Presents at Faraday Discussion
On September 12, 2022, ProChem’s Chief Technology Officer Dr. V. P. Balema will be presenting a poster on “Mechanochemically – Driven 3D Heterostructuring of Metal Chalcogenides” at Faraday Discussion – Mechanochemistry: Fundamentals, Applications and Future.
The presentation discusses generation of 3D-heterostructures with incommensurate arrangements from well-defined building blocks using an unconventional synthetic approach, comprising mechanochemically facilitated reshuffling of layered transition-metal dichalcogenides MX2, [1,2], and non-layered rare-earth metal monochalcogenides REX to form MX2/M’X2 or (REX)nMX2, 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 MoS2 and HfS2 [1], 3D-heterostructuring is energetically favorable over alloying in M’X 2 – MX2 systems, whereM, 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 semi-conductivity, and superconductivity in some misfit heterostructures [1,3,4].
References:
- I. Z. Hlova et al. Nanoscale Adv. (2021), 3, 4065
- I. Z. Hlova et al. Chem. Commun. (2018), 54, 12574
- O. Dolotko et al. Nat. Commun. (2020), 11, 3005
- M. B. Sreedhara et al. Chem. Mater. (2022), 34, 1838