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Keywords:

  • 2D nanomaterials;
  • intercalation–deintercalation;
  • vanadium dioxides;
  • XAFS;
  • band gaps
Thumbnail image of graphical abstract

Exfoliation of layered bulk VO2(B) with strong covalent bonding by a convenient room-temperature intercalation-deintercalation strategy is proposed to obtain ultrathin sheets with atomic thickness of ∼0.62 nm. This VO2(B) single layer possesses a more symmetric atomic structure with slight lattice expansion that widens the band gap Energy by ΔEg = 0.19 eV, providing more possibilities for energy-level engineering in photovoltaics.