Figure 4From: Controllable synthesis of ZnO nanostructures on the Si substrate by a hydrothermal routePlan view and cross sections (insets) SEM images of the ZnO nanorods. They are grown at 0.025 M, at 85°C for 5 h on the RF-sputtered seed layer with a thickness of (a) 40 nm, (b) 80 nm, (c) 300 nm, and (d) 1 μm, respectively.Back to article page