Login / Signup

Realization of an Ideal Cairo Tessellation in Nickel Diazenide NiN2: High-Pressure Route to Pentagonal 2D Materials.

Maxim BykovElena BykovaAlena V PonomarevaFerenc TasnádiStella CharitonVitali B PrakapenkaKonstantin GlazyrinJesse S SmithMohammad F MahmoodIgor A AbrikosovAlexander F Goncharov
Published in: ACS nano (2021)
Most of the studied two-dimensional (2D) materials are based on highly symmetric hexagonal structural motifs. In contrast, lower-symmetry structures may have exciting anisotropic properties leading to various applications in nanoelectronics. In this work we report the synthesis of nickel diazenide NiN2 which possesses atomic-thick layers comprised of Ni2N3 pentagons forming Cairo-type tessellation. The layers of NiN2 are weakly bonded with the calculated exfoliation energy of 0.72 J/m2, which is just slightly larger than that of graphene. The compound crystallizes in the space group of the ideal Cairo tiling (P4/mbm) and possesses significant anisotropy of elastic properties. The single-layer NiN2 is a direct-band-gap semiconductor, while the bulk material is metallic. This indicates the promise of NiN2 to be a precursor of a pentagonal 2D material with a tunable direct band gap.
Keyphrases
  • carbon nanotubes
  • metal organic framework
  • room temperature
  • magnetic resonance
  • high resolution
  • reduced graphene oxide
  • solar cells
  • big data
  • mass spectrometry
  • ionic liquid
  • walled carbon nanotubes
  • light emitting