Abstract
Herein, we report the synthesis of Mn1-xNixFe2O4 (MNFO) nanoparticles (NPs) with lime peel and capsicum coating for different compositions (x = 0.0–0.4) by chemical co-precipitation method tested for antibacterial properties. The coated sample, Mn0.6Ni0.4Fe2O4 NPs has exhibited excellent antibacterial activity against gram positive and negative species compared to uncoated ones. Significantly, lime peel coated samples have exhibited more antibacterial effect as compared to capsaicin coated at x = 0.4. The crystallite size of the sample analysed via X-ray diffraction (XRD) is in nano regime, 7–10 nm. Results show considerably low strain for all samples except a peak value for composition at x = 0.1; which can be ascribed to the cation distribution and different ionic radii of the bivalent metal ions. Fourier transform infrared spectroscopy (FTIR) confirms presence of functional groups. The ultraviolet visible (UV–Vis) spectra reveal indirect band gap of 2–2.5 eV. The field emission scanning electron microscopy (FESEM) analysis shows nano cubical structure. The energy dispersive x-ray (EDX) spectroscopy confirms the presence of elements (Mn, Ni, Fe, and O) in the sample. The magnetic properties have investigated using vibrating sample magnetometer (VSM), shows saturation magnetization and remnant magnetization decreases with increasing Ni content. The low values of saturation magnetization and coercive force is indicative of formation of soft ferrite with super paramagnetic in nature.
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