Tuning structural and optical properties of GO@Mn-doped Co3O4 hybrid nanocomposite by a facile synthesis

Metal and metal oxide materials are mostly used to tune the optical characteristics. The optical and systemic effects of pure Cobalt Oxide (Co₃O₄) are examined by knocking out the dissimilar assemblage of Manganese (Mn) ions using the co-precipitation method. Graphene oxide (GO) reduces the optical band gap and enhances the effects of ethical Co₃O₄ and MnCo₃O₄ by hydrothermal procedure. The percentage of Mn over pure Co₃O₄ was 0.09 wt%, 0.18 wt%, 0.27 wt%, and GO doped over MnCo₃O₄ was 1 wt%. Remarkably, spinel-type cobalt oxide has two participation band gaps at 494 nm and 772 nm of nanocomposites which then shifted from 494 nm to 510 nm and 772 nm to 779 nm with the doping of GO. The result describes that the band gap was minimized from 1.76 eV to 1.59 eV respectively to accommodate the density of states by doping of Mn ions and GO. Conductivity and optical absorbance were also increased by doping assemblage of Mn ions and GO. XRD peaks show the FCC crystalline structure of Co₃O₄, and the GO peak disappeared for @MnCo₃O₄, indicating that GO was completely reduced to rGO during the synthesis process.