Figure 1
From: Tunable band gap in few-layer graphene by surface adsorption
Possible adsorption sites of the metal atom on FLG.
(a) Lattice structure of ABC-stacked graphene trilayer; gray/red/blue indicate links on the top/middle/bottom layers and H/B/T0/T1 distinguish the four adsorption sites for a metal adatom on graphene: hollow center (H), bridge center (B) and two top sites (T0 and T1) in a 2 × 2 graphene supercell. (b–d) Side views of the metal-adsorbed FLG with metal atom at the (b) H site, (c) B site, (d) T0 site and (e) T1 site. The T0 site is right above the carbon atoms of the top and middle layers and the hollow center of the bottom layer, while the T1 site is above the carbon atoms of the top and bottom layers and the hollow center of the middle layer.
