Figure 4.

a Schematic of the nucleus formed on the molten Au–Zn droplet and ZnO nanowire growth at initial stages with tapering. b ZnO nanowires with tapered base and uniform long stems. c Plot of nanowire diameter vs. length for both tapered and needle-like ZnO nanowires. d Plot showing growth and tapering rates of needle-like ZnO nanowires.

Kar et al. Nanoscale Res Lett 2011 6:3   doi:10.1007/s11671-010-9738-3