FIG. 2.
(a) The HAADF micrograph belongs to the pristine-VO2/NiO-VO2 thin film with [100] and [110] zone axis of M1 monoclinic VO2 and NiO, respectively. (b) The atomic-scale HAADF image of VO2 in (a). (c) The HAADF micrograph belongs to the high-temperature vacuum annealed VO2/NiO-VO2 thin film with [012] and [110] zone axis of M2 monoclinic VO2 and NiO, respectively. (d) The atomic-scale HAADF image of VO2 in (c). (e) The HAADF micrograph belongs to the low-temperature vacuum annealed VO2/NiO-VO2 thin film with [001] and [] zone axis of M2 monoclinic VO2 and NiO, respectively. (f) The atomic-scale HAADF image of VO2 in (e). The inset figures provide the schematic of atomic structures for the corresponding micrograph.