Materials scientists shuffle atomic layers like playing cards to make new quantum materials

(Nanowerk News) Materials scientists can now shuffle layered compounds together, much like combining two different decks of cards (Nanoscale Advances, "Incommensurate transition-metal dichalcogenides via mechanochemical reshuffling of binary precursors").
The technique, recently discovered by a team of researchers at the U.S. Department of Energy’s Ames Laboratory, is leading to development of new materials with unusual electron transport properties that have potential applications in next-generation quantum technologies.
The discovered technique has shown another unexpected and promising application in new materials design. The “reshuffling” approach can generate thermally stable three-dimensional (3D) heterostructures from layered transition metal dichalcogenides (TMDCs).
These are van der Waals materials composed of metal nanolayers sandwiched between two other layers of chalcogens – sulfur, selenium, or tellurium. Similar to graphite, these compounds can be exfoliated into 2D layers, which display unique electron transport properties and quantum phenomena.
heterostructured transition-metal dichalcogenides
A new family of heterostructured transition-metal dichalcogenides (TMDCs) with incommensurate (“misfit”) spatial arrangements of well-defined layers was prepared from structurally dissimilar single-phase 2H-MoS2 and 1T-HfS2 materials.
“TMDCs are very intriguing to researchers as a possibility for applications in renewable energy, catalysis and optoelectronics, to name only a few,” said project leader Viktor Balema, a Senior Scientist in the Divisions of Materials Sciences and Engineering at Ames Laboratory. “Our goal in research has been the development of such re-assembly methods for these layered materials, which are not only efficient, but also scalable and cost effective in production.”
Researchers at Ames Laboratory have been successful in overcoming one of the major challenges of composing these layered materials – the difficulty of sandwiching together atomically dissimilar, incommensurate, materials – through the use of mechanochemistry that is facilitated by ball milling.
“Now, we have demonstrated that we can mechanochemically design novel layered heterostructures, control their composition and tune their properties,” said Ihor Hlova, a scientist in the Divisions of Materials Sciences and Engineering at Ames Laboratory. “This opens a way to a variety of different combinations – the possibilities are basically unlimited.”
So far, this approach has proven to work on several very different groups of compounds and continues to surprise the scientists with new discoveries. The materials prepared using the team’s “layers-reshuffling” technique have already shown broad range of electron transport properties ranging from semi-conductivity to metallic conductivity, depending on the building blocks involved.
The research was funded in part by Ames Laboratory’s Laboratory Directed Research and Development Program. Theoretical modeling helped to better understand the experimental results and plan the path forward for this research; and an extensive collaboration with colleagues from the Petro Sahaidachnyi National Ground Forces Academy and the Ivan Franko National University in L’viv (Ukraine), and Texas A&M University added much needed capabilities to the project.
Source: Ames Laboratory
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