Figure 4From: Effect of Size-Dependent Thermal Instability on Synthesis of Zn2 SiO4-SiO x Core–Shell Nanotube Arrays and Their Cathodoluminescence Propertiesa HAADF-STEM image of two typical Zn2SiO4 nanotube morphologies, a SiO x -shelled Zn2SiO4 nanochain-encapsulated nanotube (left) and a SiO x -coated Zn2SiO4 nanotube (right); b, c, and d the corresponding spatially resolved elemental EDS maps of Zn, Si, and OBack to article page