Study Optical Properties of Nickel Oxide Syntheses by Chemical Spray Pyrolysis

In this study, thin nickel oxide nanomembranes were obtained using thermal chemical spraying technology, which involves spraying a green-colored chemical solution at a rate of 30 sprays onto glass substrates with an area of 6.25 cm². This thin layer was prepared at a temperature of 450 °C under a pressure of 2 bar. The optical properties of nickel oxide films were studied using analytical methods such as dual spectral analysis of ultraviolet and visible light and their relationship to wavelengths which ranging from 190 nm to 1100 nm. The surface morphology was also studied using a scanning electron microscope (SEM). The analysis results showed that the nickel oxide film particles were irregularly spherical, with diameters ranging from 10 to 55 nm. These glass substrates were then exposed to ultraviolet radiation UVC for (1-3) hours, with each irradiation session lasting only one hour. By using a visible ultraviolet spectrometer before and after each hour, the results showed that the absorbance spectrum, changes with wavelength and also changes with irradiation time, decreasing with increasing wavelength and increasing with increasing irradiation time. The energy gap for NiO films prepared at a temperature of 450 °C was also calculated, and it was found that its value before irradiation was 3.70 eV and then began to decrease with increasing irradiation hours, reaching 3.63 eV. These results are consistent with those of previous studies, including studies [Faycal et al ,2018] and [kamal et al, 2004], which recorded energy gaps of (3.8 and 3.65) eV respectively.