Fig. 7. Room-temperature Raman spectra of pure ZnO nanoparticles at 750 °C, Zn1-xMgxO nanoparticles, partially opened nanowire-on-spherical shells, hemisphericshells and chain-like nanoparticles with
x = 2.87%, 3.51%, 4.43% and 5.01% at750, 850, 900 and 1000 °C, respectively.