FESEM images of well-aligned ZnO nanowire arrays (approximately 15 nm) grown on Cu substrate. (a) Low-magnification image from top view. (b) Aligned nanowires at a viewing angle. (c) Top view at one point. (d) Another view at another point. (e) High-magnification image of vertically aligned nanowires. (f) Dimensional measurements of a single nanowire.
Shrama et al. Nanoscale Research Letters 2014 9:122 doi:10.1186/1556-276X-9-122