▎ 摘　　要

Mn2O3 and Mn2O3/reduced graphene oxide (rGO) composites were prepared by the hydrothermal and sono-chemical method, respectively. The prepared samples were characterized via X-ray diffraction, Transmission electron microscope, Fourier transform infra-red, and Raman spectroscopy. Di-Manganese tri oxide morphology appeared new morphology as polyhedron prism nano-rods as to the best of our knowledge, no work has described before for Mn2O3 nanoparticles (NPs). The Raman vibrational band at 694 cm-1 is related to the Mn-O bond of trivalent manganese ions (Mn3+). XRD and TEM analysis confirmed the decrease of particle sizes with the insertion of rGO sheet to the matrix. The optical properties were measured by UV-visible spectrometer. The obtained data from the absorption spectra was used to investigate the optical parameters. The optical band gap was tuned to a lower value of about 1.57 eV and the refractive index increased from 4.031 for Mn2O3 to 4.429 for Mn2O3/rGO. The obtained results revealed that the optical and morphological structure of Mn2O3 were enhanced via the addition of rGO sheets to the matrix which make it useful in optoelectronic applications.