Ni Doped Fe₃O₄ Magnetic Nanoparticles

Abstract

In this work, the effect of nickel doping on the structural and magnetic properties of Fe3O4 nanoparticles is analysed. Ni(x)Fe(3-x)O4 nanoparticles (x = 0, 0.04, 0.06 and 0.11) were obtained by chemical co-precipitation method, starting from a mixture of FeCl2 x 4H2O and Ni(AcO)2 x 4H2O salts. The analysis of the structure and composition of the synthesized nanoparticles confirms their nanometer size (main sizes around 10 nm) and the inclusion of the Ni atoms in the characteristic spinel structure of the magnetite Fe3O4 phase. In order to characterize in detail the structure of the samples, X-ray absorption (XANES) measurements were performed on the Ni and Fe K-edges. The results indicate the oxidation of the Ni atoms to the 2+ state and the location of the Ni2+ cations in the Fe2+ octahedral sites. With respect to the magnetic properties, the samples display the characteristic superparamagnetic behaviour, with anhysteretic magnetic response at room temperature. The estimated magnetic moment confirms the partial substitution of the Fe2+ cations by Ni2+ atoms in the octahedral sites of the spinel structure.

Tuning the Magnetic Properties of Nanoparticles

“…Cationic exchange is especially attractive in the case of ferrite nanoparticles, where physical and magnetic properties can be tuned by replacing a cation without affecting its crystal structure [100]. Larumbe et al studied the effect of nickel doping on Fe 3 O 4 MNPs, where Ni +2 partially displaced Fe +2 from the octahedral sites [44]. Although there was no substantial change in the value of Ms, the blocking temperature for MNPs of the form Ni x Fe 3− x O 4 reached a maximum for Ni 0.06 Fe 2.94 O 4 MNPs ( i.e.…”

Evaluation of the Antitumor Activity by Ni Nanoparticles with Verbascoside

“…Cancer is quickly becoming the leading cause of death worldwide [1]. Nickel nanoparticles (Ni NPs) have been applied in a wide range of fields due to their unique structure and properties [2][3][4][5][6]. Over the past decades, nanoparticles have been increasingly applied in clinical diagnoses and cancer therapy with promising and far-ranging prospects in the medical fields.…”

Effect of Mechanochemical Treatment on Magnetic Properties of Nanodimensional Magnetite-Type Materials

“…nanoparticles [1,3,12,13]. We cannot exclude again the inuence of the agglomeration eects typical for wet synthesis methods as co-precipitation [11]. …”