Metal-Insulator Phase Transition in Quasi-One-Dimensional VO₂ Structures

Figure 5

(a) Bright (upper left) and dark (upper right) field optical images of VO₂ nanobeams grown on a SiO₂ surface at T = 100°C during cooling in air. The schematic diagram shows the periodic domain pattern of a VO₂ nanobeam strained on the SiO₂ substrate. Blue and red colors correspond to tensile and compressive strains, respectively. “M” denotes metallic phase, and the unlabeled intervening regions are insulating phase. (b) Resistance of an on-substrate VO₂ nanobeam as a function of temperature during a heating cycle (red curve) and a cooling cycle (blue curve). The inset shows a SEM image of the on-substrate VO₂ nanobeam device. Panels (a) and (b) adapted with permission from [33].

(a)

(b)