Physical, spectroscopic and antibacterial investigation of Mg0.3Zn0.5Mn0.2Fe2O4 via temperature dependent hydrothermal approach

Abstract

Mg0.3Zn0.5Mn0.2Fe2O4 spinel ferrite magnetic nanoparticles (MNPs) were synthesized with sealing temperatures of 160 °C, 180 °C, and 200 °C by hydrothermal route. The physicochemical parameters of synthesized MNPs were investigated by XRD, FTIR and VSM. The X-ray diffraction reveals the more crystallinity with temperature hence crystallite size (12 nm-18 nm). The functional group analysis by two strong absorptions within 400–600 cm−1 of FTIR and elemental analysis (EDS) confirms spinel ferrite MNPs. The M-H loop with minimal saturation Magnetization MS (15.90, 22.96, 21.96 emu/g), Coercivity HC (21.04, 22.69, and 20.63 Oe) and remnant magnetization Mr (0.64, 0.81, and 0.78 emu/g) as recorded by VSM. Particle size obtained by TEM signifies superparamagnetic nature of MNPs. The dielectric properties of MNPs with frequency were recorded using Impedance spectroscopy which were found to be influenced by crystallization. The dielectric constant of all samples decreases with rise in frequency, indicating dielectric dispersion at lower frequencies, possibly due to interfacial polarization. The antibacterial efficacy of MNPs against different gram positive and gram-negative bacteria was demonstrated by Zones of inhibition.