Figure 2.

ZnO nanostructures grown on annealed c-plane sapphire substrates. Top-view SEM images of ZnO nanostructures grown on c-plane sapphire substrates (a) as-received and annealed at (b) 1,000°C, (c) 1,200°C and (d) 1,400°C.

Weigand et al. Nanoscale Research Letters 2011 6:566   doi:10.1186/1556-276X-6-566
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