Bacterial resistance caused by antibiotic misuse has garnered substantial attention, prompting numerous researchers to develop materials that can combat these resistant pathogens. The hydrothermal method is employed to produce γ-MnO2 nanostars and to coat them with Fe2O3 nanoparticles. The materials are characterized using XRD, FE-SEM, EDX, and UV-vis spectrophotometry, as well as antioxidant and antibacterial activities. The nano γ-MnO2 star shapes are coated with tiny spherical Fe2O3 nanoparticles with diameters of 35-47 nm. The peaks located at the crystal planes (120), (031), (131), (230), (300), (160), (421), and (003) are represented by the values of 2θ = 22.36º, 34.36º, 37.22º, 38.78º, 42.56º, 56.14º, 65.48º and 68.82º, respectively, and no additional peaks for any more materials showing pure γ-MnO2. The SEM descriptions of the star shapes of γ-MnO2 nanostructure in three different magnifications. The diameters of the six-branched star-shaped γ-MnO2 are about 140 nm close to the star's center, 55–70 nm close to its tips, and 1.5–4 μm in length. The EDX analysis of the γ-MnO2 nanostars are coated with Fe2O3 nanoparticles. It clearly shows the elemental composition that includes Mn, O, and Fe. The radical scavenging performance of the γ-MnO2 nanostars coated with Fe2O3 nanoparticles is showed substantial enhancement compared to bare γ-MnO2 nanostars. The prepared materials exhibit comparable antibacterial properties, with noticeable activity against Gram-negative strains (Salmonella and Escherichia coli), but no effectiveness against Gram-positive strains (Bacillus subtilis and Staphylococcus aureus).
