Fig. 2. (a)–(c), (f) and (g) FE-SEM images of pure ZnO nanoparticles at 750 C, Zn1xMgxO nanoparticles, partially opened nanowire-on-spherical shells, hemispheric shells and
chain-like nanoparticles with x = 2.87%, 3.51%, 4.43% and 5.01% at 750, 850, 900 and 1000 C, respectively. (d) and (e) The magnified FE-SEM images of Zn1xMgxO nanowireon-
spherical shells with x = 3.51% grown at 850 C.