Abstract
The controlled deposition and post-deposition treatments are fundamental steps in the synthesis of thin films in the range of nanometer to several micrometers in thickness for various applications. Because the uniform coating of nano-particles of doped metal oxide modifies the properties of metal oxide, thin films of cobalt-doped manganese oxide are prepared using the Jet nebulizer spray pyrolysis procedure at a temperature of 300°C in this study. The thin films are annealed in an air environment for two hours at various temperatures, including 350°C, 450°C, and 550°C. Cobalt thin films were produced and annealed for two hours at 550 °C in the air before being tested. The effect of annealing temperature and atomic percentage content of dopant cobalt in manganese oxide thin film on their properties were characterized by XRD, photoluminescence spectroscopy, UV-vis spectroscopic technique, scanning electron microscopy, and EDX. The characterization of the thin film reveals that these thin films are made up of uniformly coated doped metal oxide particles with (002) plan as a preferential orientation of crystal growth and band gap energy in the span of 2.5 -1.65 eV. The sensing property of the thin films towards ethanol was also characterized.
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