Abstract

Nanomaterials have been used in advanced biomedical applications due to their superparamagnetic and antimicrobial properties. The adequate superparamagnetic and antimicrobial capacity has improved the nanomaterials applicability in biomedical applications. Herein, superparamagnetic and antibacterial Ce doped NiO nanomaterials were developed by dissolving cerium(III) nitrate and nickel(II) nitrate at different concentrations (1-X, X = 0.001, 0.002 and 0.003, and 0.099, 0.098 and 0.097 M, respectively) using Azadirachta Indica extract as a nucleation agent. The oxidation states Ni(2p), Ce(3d) and O(1s) of the nanomaterials were investigated by XPS spectra. The XRD patterns determined that the Ce doped NiO nanomaterials exhibit face-centred​ cubic structures. FE-SEM illustrates the surface structure of the nanomaterials, which have non-uniform spherical particles. Photoluminescence spectra reveal multi-emission centres​ created in the nanostructure. In addition, the electrical and magnetic behaviours of the Ce-doped NiO nanomaterials were investigated to determine the dielectric polarization and magnetic properties. The nanomaterials’ superparamagnetic behaviour was studied using a vibrating sample magnetometer at ambient temperature. Additionally, nanostructures’ bacterial activity significantly inhibited Staphylococcus Aureus and Klebsiella Pneumoniae. This investigation indicates that forming a nanostructure has significant advantages in biomedical applications.