Controlled Synthesis of Hollow Hemispheric ZnO Shells/Cages on Graphite Fiber
Figure 6
Schematic diagram of the growth process of the hemispheric ZnO shells/cages. (a) Vapor ZnOx reduced into vapor Zn, and Zn droplets/particles are precipitated on the graphite surface. (b) Zn particles transforming into ZnO from the outside surface to the core, and meantime Zn in the core is ready to vaporize at elevated temperature, leaving behind a hollow cage-like ZnO crust. (c) Precipitation, oxidation, and vaporization are undergoing simultaneously during the experiment, and more hollow hemispheric ZnO shells/cages are formed and stacked together around the graphite fiber.
