Figure 2.

SEM images of ZnO structures. (a) Top-view SEM images of ZnO structures grown at a current density of 0.0 mA/cm2 (hydrothermal). (b)-(f) Top-view and cross-sectional SEM images of the initial ZnO structures grown at current densities of -0.1, -0.5, -1.0, -1.5, and -2.0 mA/cm2, respectively.

Aziz et al. Nanoscale Research Letters 2014 9:95   doi:10.1186/1556-276X-9-95
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