Fabrication and characterization of Zn-ZnO core-shell microspheres from nanorods

(a) A typical SEM image of the Zn core spheres. (b-c) SEM images corresponding to the ZnO nanorods shell/Zn core grown at different concentration ratio Zn2+/OH−, respectively. (d) SEM from junction ZnO/Zn cross-sectional view. All scale bars are the same for (a-d).