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Exfoliation of natural van der Waals heterostructures to a single unit cell thickness. | LitMetric

AI Article Synopsis

  • Weak interlayer interactions in van der Waals crystals allow for easy mechanical exfoliation into two-dimensional (2D) materials, which have unique physical properties compared to their bulk forms.
  • Researchers successfully mechanically exfoliated the mineral franckeite into a 2D form, revealing that chemical species segregate into distinct layers, making it easier to obtain very thin structures.
  • The exfoliated franckeite exhibits p-type electrical conductivity and excellent electrochemical properties, suggesting potential applications, supported by density functional theory calculations of its electronic band structure.

Article Abstract

Weak interlayer interactions in van der Waals crystals facilitate their mechanical exfoliation to monolayer and few-layer two-dimensional materials, which often exhibit striking physical phenomena absent in their bulk form. Here we utilize mechanical exfoliation to produce a two-dimensional form of a mineral franckeite and show that the phase segregation of chemical species into discrete layers at the sub-nanometre scale facilitates franckeite's layered structure and basal cleavage down to a single unit cell thickness. This behaviour is likely to be common in a wider family of complex minerals and could be exploited for a single-step synthesis of van der Waals heterostructures, as an alternative to artificial stacking of individual two-dimensional crystals. We demonstrate p-type electrical conductivity and remarkable electrochemical properties of the exfoliated crystals, showing promise for a range of applications, and use the density functional theory calculations of franckeite's electronic band structure to rationalize the experimental results.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5316834PMC
http://dx.doi.org/10.1038/ncomms14410DOI Listing

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