SYNTHESIS AND CHARACTERIZATION OF ZnO BASED NANOSTRUCTURES

Abstract

More metal oxides are practical materials that have propelled applications in numerous zones, as a result of their different properties (optical, electrical, attractive, and so on.), hardness, warm strength and substance resistance. Recently, the oxide semiconductor is very useful for electronic and microelectronic devices. ZnO is the most famous in that area. ZnO is a wide band gap semiconductor with the value 3.37eV. It has large exciton binding energy of 60 meV. One dimensional nanostructures exhibit interesting electronic and optical properties due to their low dimensionally leading to confinement effect. In this work, zinc oxide (ZnO) nano rods of different shapes were successfully synthesized by hydrothermal method. Zinc nitrate hexahydrate and hexamethylenetramine (HMTA) were used as precursor and surfactant respectively. Absolute ethanol was used as solvent and pH was adjusted by dilute solution of NaOH. The ZnO seed layer was formed in the buffer solution of different concentration. ZnO nano wires of different shape were further grown by varying the pH of solution in the hydrothermal process. The samples were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), IV characterization and UV visible spectroscopy. The scanning electron microscopy confirmed formation of the nano sized seed and growth of various shaped nano wires in hydrothermal solution. The XRD diffraction pattern confirmed the formation of hexagonal wurtzite crystal structure of ZnO. The average particle size observed in SEM image was 12-14 nm. The optical properties of the sample are investigated by UV-visible spectroscopy. For different pH value, growth time and concentration of hydrothermal solution, nano-wire of different shapes and size were obtained. The world in this manner now requests a material that ought to have inborn properties like bigger band hole, higher electron versatility and additionally higher breakdown field quality. So on making examination about such a material the name of compound turns out is "Zinc Oxide" which is a wide crevice semiconductor material exceptionally well fulfilling the above required properties. Not just has this Zinc oxide had numerous flexible properties for UV gadgets, spintronic gadgets and sensor applications. Additionally ZnO has been regularly utilized as a part of its polycrystalline frame more than hundred years in an extensive variety of utilizations.