Figure 2From: The Periodic Instability of Diameter of ZnO Nanowires via a Self-oscillatory MechanismSEM images of periodic bead-like ZnO nanowires on sapphire: (a) low-magnification image of periodic bead-like nanowire; (b) low-magnification image of periodic bead-like nanowire; it could be seen the periodic instability diminishes when diameter is large; (c) high low-magnification image of periodic bead-like nanowireBack to article page