Figure 2From: Effects of substrate annealing on the gold-catalyzed growth of ZnO nanostructures 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.Back to article page