Structural and Optical Properties of Tio2:Nio Nanoparticles Thin Films Prepare by Chemical Spray Pyrolysis

Abstract

The structural and optical properties of pure and doped nano titanium dioxide (TiO2) films, prepared using chemical spray pyrolysis (CSP) technique, with different nano-size nickel oxide (NiO) concentrations in the range (3-9) wt% have been studied. X-Ray diffraction (XRD) technique was used to analysis the structure of the prepared thin films. The results revealed that the structure properties of TiO2 was polycrystalline with anatase phase. The parameters, energy gap, extinction coefficient, refractive index and real and imaginary parts were studied using absorbance and transmittance measurements from a computerized ultraviolet visible spectrophotometer in the wavelengths range (300-800) nm. Optical properties of TiO2 were affected by the addition of NiO impurity where the transmittance increased as NiO concentration increased but with more adding the transmittance returned to decrease again. It was found that the extinction coefficient, refractive index and real and imaginary parts values decreased with increasing the doping percentage up to 7% and then increases again at 9%. Energy gap values increased after doping with NiO where the values were in the range was 3.31 to 3.51 eV.