Structural and Optical Properties Study of Cobalt Oxide and Copper Oxide Composite: Energy Band Gap Evaluation.

Abstract The present investigation reports on synthesizing (Co 3 O 4 -CuO) nanoparticles by partially green synthesis using leaf extract of Vitis vinifera to study the structural and optical properties as a prepared sample by X-ray diffraction (XRD) and FE-SEM (Field Emission Scanning Electron Microscopy) coupled with EDS (Energy-Dispersive X-ray spectroscopy) and UV-Vis spectroscopy. The average crystallite size calculated from the Scherrer formula of samples is 19.60, 28.58, and 33.32, nm for Co 3 O 4 , CuO, and their composite due to the decrease in the FWHM (full width at half maximum) of the XRD main peaks and the improvement of the crystalline degree of the products, The peaks can be indexed to be typical cubic, monoclinic and cubic structures respectively. The energy band gap was characterized by UV-visible absorption spectroscopy was, 3.2 eV for CuO,3.8 eV for Co 3 O 4 and 4eV for CuCo 3 O 4 . The homogeneous distribution of cobalt, copper, and oxygen in the mapping image aligns with the expected composition of the nanocomposite, indicating a successful synthesis of the nanoparticles with a uniform elemental distribution. The CuCo 3 O 4 nanoparticles composite the particles appear to have irregular shapes and are somewhat clustered, indicating agglomeration which is common in nanoparticles.