Abstract
Zinc ferrite nanocrystals were prepared from an aqueous solution containing metal nitrates and various of concentrations of poly(vinyl pyrrolidone) (PVP), i.e., 0, 15, 40, and 55 g/L, as a capping agent. To stabilize the particles, they were thermally treated at 873 K, as an optimum calcination temperature. The behaviors of the polymeric precursor were analyzed by use of simultaneous thermo-gravimetry (TG) and derivative thermo-gravimetry analyses (DTG). The presence of the crystalline phase in each sample was confirmed by X-ray diffraction (XRD) analysis. The average particle size and the morphology of the nanoparticles were determined by transmission electron microscopy (TEM), and these parameters were found to differ at various concentrations of PVP. Fourier transform infrared spectroscopy (FT-IR) confirmed the presence of metal oxide bands for all the PVP concentrations and confirmed the absence of organic bands for PVP concentrations less than 55 g/L. Measurements of the magnetization value of the zinc ferrite nanoparticles were obtained at room temperature by using a vibrating sample magnetometer (VSM), which showed that, in the absence of PVP, the sample exhibited a paramagnetic behavior while, in the presence of PVP, samples have a super-paramagnetic behavior.
Highlights
The interest in research related to metal spinel ferrite nanoparticles, with the structure AB2O4 in which A and B pertain to tetrahedral and octahedral cation sites, respectively, and O indicates the oxygen anion site, has increased significantly in recent years
In this work, the fundamental questions that we are attempting to address is how poly(vinyl pyrrolidone) (PVP) caps zinc ferrite nanoparticles in aqueous solution containing metal nitrates and another, what amount is optimum concentration of the PVP capping agent at which the nanoparticles are pure; this is the concentration at which the nanoparticles have the smallest particle size and a nearly uniform distribution of shapes
We briefly report the results of our previous work [16] where the authors investigated on effect of calcinations temperature on phase composition, morphology and magnetic properties of zinc ferrite nanoparticles
Summary
The interest in research related to metal spinel ferrite nanoparticles, with the structure AB2O4 in which A and B pertain to tetrahedral and octahedral cation sites, respectively, and O indicates the oxygen anion site, has increased significantly in recent years. This is due to their potential applications in ferrofluids [1], magnetoptics [2], spintronics [3], biomedical applications [4,5], and anodes for batteries [6].
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