Figure 3: Surface morphology and lattice structure measured by STM.
From: Robust ultra-low-friction state of graphene via moiré superlattice confinement
Representative 3D topographic images containing both base and island regions collected on (a) as-grown graphene and (b) FGr, respectively. (c,d) High-resolution topographic STM images acquired from the island and the base regions from a, together with the corresponding Fourier transform patterns. (e,f) High-resolution atomic lattice images acquired from the island and the base regions from b, together with the corresponding Fourier transform patterns. Although the outline of moiré pattern becomes slightly vague, the hexagonal lattice structure of graphene remains almost intact in the island region as indicated by the standard sixfold symmetry of the Fourier transform pattern e. The lattice structure is severely distorted in the base region, and blue and green arrows highlight the compressed and stretched lattices f, respectively. Scale bars are 2 nm. 3D, three-dimensional.
