Figure 3
Top-view and cross-sectional SEM images of final ZnO nanostructures. The nanostructures were grown at current densities of (a) -0.1 mA/cm2, (b) -0.5 mA/cm2, (c) -1.0 mA/cm2, (d) -1.5 mA/cm2, (e) -2.0 mA/cm2.
Figure 3 | Nanoscale Research Letters