Effect of Molarity on the Structural, Morphological, Optical Properties and Magnetic behavior of NiO Thin Films

The fabrication of Nickel oxide (NiO) thin films by spray pyrolysis technique were coated onto a glass substrate maintained at constant substrate temperature 350 ̊C at different mole concentrations (0.1 M, 0.2 M and 0.3 M ). The influence of deposited thin film on the structural, morphological, optical properties was characterized by X-ray diffraction analysis (XRD), FE- SEM and UV-Vis spectroscopy. A special emphasis on the magnetic properties of NiO thin films were determined using vibrating sample magnetometer. The NiO thin film displayed the crystalline nature with cubic structure. The XRD parameters were estimated and tabulated. The homogeneous, uniform spherical grains were observed from FESEM. The optical band gap was estimated from Tauc’s relation and was found to be 3.40 eV, 3.39 eV and 3.34 eV respectively for concentrations 0.1, 0.2 and 0.3 M. The NiO thin films possess superparamagnetic ordering which suggest that the magnetic behavior may be due to the size effects.