Fig. 2: Structure and property evolution from MoS2 flake to MoS2[O2]x superlattice.
From: 2D atomic crystal molecular superlattices by soft plasma intercalation
a, b AFM images of a pristine mechanically exfoliated four-layer MoS2 flake and the corresponding MoS2[O2]x superlattice obtained by the 3 min long oxygen plasma intercalation. Insets are the corresponding optical images and height profiles along the dashed white lines. Scale bars: 1 μm. c, d Cross-sectional TEM images of a pristine MoS2 flake and a MoS2[O2]x superlattice. Scale bars: 2 nm. e, f PL and Raman spectra of the MoS2 flake and MoS2[O2]x superlattice in a and b, respectively, as well as the corresponding spectra (after multiplying by four) of monolayer MoS2. g High-resolution XPS spectra of S 2p, Mo 3d, and O 1s of the pristine MoS2 flake and MoS2[O2]x superlattice.
