Nanocrystalline NiO structure: preferred oriented growthNanocrystalline NiO structure: preferred oriented growth

Authors : Ali RAHMATI, Soheila MARDANI

Pages : 280-287

View : 19 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Nickel oxide insert ignore into journalissuearticles values(NiO); nanostructures were deposited on Si insert ignore into journalissuearticles values(100);, potassium bromide insert ignore into journalissuearticles values(KBr);, and glass slide substrates at room temperature by the evaporation technique. The prepared samples were annealed at temperatures of 400 $^{\circ}$C and 600 $^{\circ}$C in air atmosphere. The structure, morphology, crystalline phase, optical properties, and chemical bonding of nanocrystalline nickel oxide were investigated by scanning electron microscopy insert ignore into journalissuearticles values(SEM);, X-ray diffraction insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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.
Keywords : NiO nanocrystallite, preferred orientation growth, thermal evaporation