Figure 1From: Effect of Size-Dependent Thermal Instability on Synthesis of Zn2 SiO4-SiO x Core–Shell Nanotube Arrays and Their Cathodoluminescence PropertiesSEM images of a, b a ZNW template and c, d a ZSO sample. The inset top-view SEM image shows the ZSO sample after scratching surface nanotubes out of the substrate. The scale bars in a – d are 1 μm and for the inset is 500 nm. a, c cross-sectional view images, b, d top-view imagesBack to article page