LAUSR

Semiconducting metal oxide nanostructured materials are demonstrating efficient use and functional properties in devices. Manganese oxide (Mn2O3) is one of the smart semiconductor metal oxides. The hydrothermal method was found suitable to prepare γ-Mn2O3 nanoparticles. The nanostructural characterization using various advanced tools confirmed the purity and polymorph of the as-prepared γ-Mn2O3 nanoparticles. Optical analyses exposed the presence of a possible dual-band-gap in γ-Mn2O3 nanoparticles. A strong blue shift of 1.3 eV estimates the activation energy (Ea) of the nanoparticles. Furthermore, γ-Mn2O3 nanoparticles were used as dielectrics to explore the dielectric response of the material in a broad frequency domain (50 Hz–30 MHz). The dielectric spectroscopy analyses revealed the regular value of the dielectric constant (∼ 9) in the high-frequency domain, the low value of the tangent loss (0.05 ≤ tanδ ≥ 1.34), the frequency power law-dependent ac conductivity, the occurrence of single dielectric relaxation process of relaxation time 160 μs, and a non-Debye-type relaxation behavior in the γ-Mn2O3 nanoparticles. The properties assessed here indicate the functional-behavior and prospective application of the γ-Mn2O3 nanoparticles in devices.