Figure 2.

FESEM images of ZnO nanorod arrays: a low- and b high-magnification images of ZnO NRAs grown on 2-μm strip patterns; c low- and d high-magnification images of ZnO NRAs grown on 500-nm strip patterns; e low- and f high-magnification images of ZnO NRAs grown on square patterns

Ahsanulhaq et al. Nanoscale Research Letters 2009 5:669-674   doi:10.1007/s11671-009-9504-6