Fig. 6. Room-temperature PL spectra of pure ZnO nanoparticles at 750 °C, Zn1-xMgxnanoparticles, partially opened nanowire-on-spherical shells, hemispheric shellsand chain-like nanoparticles with
x = 2.87%, 3.51%, 4.43% and 5.01% at 750, 850, 900and 1000 C, respectively