X-ray diffraction pattern for the ZnO nanoparticles was recorded using an X-ray
diffractometer (MD-10) using CuKa radiation of wavelength λ=1.5406 in the scan range
2θ=20°-90°. The optical absorption spectra of ZnO dispersed in water were recorded using
UV-VIS Spectrophotometer (GENESYS 10s v1.200 2L7H311008)