Abstract

• Synthesis of Zinc Oxide nanoparticles (ZnO NPs) were made by using the prepared precursor solution of zinc nitrate hexahydrate (Zn (NO3)2 .6H2O) and different molarity of sodium hydroxide (NaOH) (1 M, 1.5 M) with solvent deionized water through the hydrothermal synthesis. The hydrothermal reaction was carried out at the temperature range (100°C – 150°C) for 7h. After the hydrothermal reactor was naturally cooled to room temperature, the obtained product was filtered and annealed at 200°C for 1h. The obtained Zinc Oxide (ZnO) nanoparticles were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and UV-Vis spectroscopy. The hexagonal wurtzite structure of good crystallinity of ZnO NPs was revealed through the XRD patterns and the crystallite sizes were 29.72 nm and 28.60 nm. The two morphologies of spherical and rod-like structures were found in SEM micrograph. The estimated energy band gaps were 3.06 eV and 3.08 eV obtained through the Tauc’ s plot method.