Abstract :
Nickel oxide (NiO) nanostructures were deposited on Si (100),potassium bromide (KBr),and glass slide substrates at room temperature by the evaporation technique. The prepared samples were annealed at temperatures of 400 °C and 600 °C in air atmosphere. The structure,morphology,crystalline phase,optical properties,and chemical bonding of nanocrystalline nickel oxide were investigated by scanning electron microscopy (SEM),X-ray diffraction (XRD),UV-visible absorption spectrum,and FT-IR spectroscopy. XRD results and SEM images showed that nickel oxide nanoparticles have preferred orientation with uniform size distribution. The as-deposited films showed preferred orientation (texture) growth. As the films were annealed,the crystallites were agglomerated to form bigger particles. Optical properties were identified by measuring transmittance using a UV-Vis spectrophotometer. Optical constants such as the refractive index n,the extinction coefficient k,and the films thickness and roughness were calculated from transmittance data using a reverse engineering method. As the sample annealed,the ad-atom surface mobility increased,and smaller crystallites agglomerated to form bigger ones. © TÜBITAK.
