Figure 5: The anchoring effect revealed by the atomistic simulations.
From: Robust ultra-low-friction state of graphene via moiré superlattice confinement
(a) DFT-relaxed morphology (I and II) of Gr/Ge(111) surface with rotation angles of 2.2° and 30°. Domain and domain wall can be distinguished in I. The corresponding interfacial charge density maps of I and II are shown in III and IV, respectively. (b) Atomic configuration (colour of top graphene layer atoms represents height change after fluorination) in the regions marked by the squares in 5a-I and 5a-II. The dotted circles highlight the projected overlaps between top C atoms and underneath Ge atoms. The lower panel presents the variation of graphene corrugation magnitude after the F atom is added. (c) Schematic representations showing the atomic configurations of backbone carbon atoms of graphene with/without moiré pattern after fluorination during friction measurement.
