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Optical, phonon and structural analysis of Na doped ZnO nanostructures

We report optical properties and X- ray peak broadening analysis of the Na doped ZnO nanostructures. To prepare Na doped ZnO, simple room temperature wet chemical method is adopted. X ray diffraction pattern shows prepared particles are in hexagonal wurtzite structure. The individual contributions of small crystallite sizes and lattice strain to the peak broadening in undoped and Na doped ZnO nanoparticles are studied using Williamson-Hall (W-H) analysis. Morphological properties are investigated through Scanning Electron Microscopic (SEM). Optical absorption measurements show an exciton absorption peak centred at 360 nm and as the doping concentration increases, exciton peak maximum shifts towards the higher wavelength. Photoluminescence measurements are carried out by exciting at 335 nm: reveal an exciton peak emission and oxygen vacancy band emissions. From Fourier Transform Infrared Spectroscopy (FTIR), the band at 433 cm-1 is attributed to Zn-O bond