Optical and Structural Properties of Controlled pH Variation on Zinc Oxide Nanostructured via Hydrothermal Method

Zinc oxide (ZnO) had been interested today because of their unique and good properties in electronic devices. ZnO nanostructured was synthesized via hydrothermal method by varied the pH value from 7, 8, 9, 10 and 11. The effect of different pH values from 7, 8, 9, 10 and 11 was changed the morphological, structure and optical properties. The samples characterized with Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD) and Ultraviolet- Visible (UV-Vis) spectroscopy. SEM is to observe the morphology images of ZnO nanostructure grains. XRD revealed the detail information on the crystallographic structure and phase formation of the materials. Lastly, UV-vis spectroscopy is to measure the band gap of optical semiconductor. From SEM result, it had shown that the hexagonal nanorods was obtained at pH 7 and pH 11 whereas nanorods is obtain at pH 8, 9 and 10. XRD revealed that the ZnO nanostructure exhibits the hexagonal wurtzite structure and the average crystallite size of ZnO nanoparticle was calculated. UV-Vis spectroscopy shows the absorption of ZnO and band determination from Tauc Plot relation plotter using UV-vis. The resulted show the pH values affect the nanostructure growth of zinc oxide semiconductor properties.