Figure 2: High-resolution lateral force images acquired from FGr and as-grown graphene.
From: Robust ultra-low-friction state of graphene via moiré superlattice confinement
(a,b) Lateral force images (forward scan direction) from the base and the island regions of FGr, respectively. (c) Corresponding friction curves measured in a,b. A long-range undulation together with atomic stick-slip could be observed on b. (d,e) Lateral force images (forward scan direction) from two distinct regions of as-grown graphene. Only regular atomic stick-slip is observed on d, while both atomic stick-slip and an extra long-range undulation appear on e. (f) Corresponding lateral force curves measured in d,e. Fourier transform filtered images inserted in b,e show clear sixfold symmetric superlattice. Scale bars, 4 nm.
