Abstract
Nano-composite films of cobalt (II·III) oxide/tin (IV) oxide (Co3O4/SnO2) to be applicable for optoelectronic applications were prepared via sol gel method with variable concentrations of the Co3O4 in the range of 0–45 mol %. Structural analysis using x-ray diffraction (XRD)of the composite powder Co3O4/SnO2 revealed that a polycrystalline structure was formed, whereas the composite films showed an amorphous behavior. Transmission electron microscope (TEM) was performed to investigate the polycrystalline structure of the prepared films. The results obtained from optical measurements indicated that the absorption edge was shifted towards longer wavelengths upon increasing the Co3O4 content from 0 to 35 mol %. Further increase of Co3O4, revealed that the cut off transmission spectra were shifted to higher energies. The refractive index of prepared films increases from 1.61to1.892 along with increasing the Co3O4 mole %. The Co3O4/SnO2 content ratio can control the optical properties and energy band gap of the mixture consequently, the present study is an innovative, promising, and appreciating the Co3O4/SnO2 based composite for optical applications.
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