Effect of Ni2+ and Fe3+ Ion Concentrations on Structural, Optical, Magnetic, and Impedance Response of NiFe2O4 Nanoparticles Prepared by Sol-Gel Process

Sankaranarayanan, R.; Shailajha, S.; Mubina, M. S. Kairon; Anilkumar, C. P.

doi:10.1007/s10948-020-05617-9

Cited by 25 publications

(5 citation statements)

References 26 publications

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“…The surface scans show very weak iron and nickel peaks, which can be seen in Figure S2 (Supporting Information), indicative of surface scan X-rays not penetrating far into the surface of the sample. The Ni 2p scans can be deconvoluted into contributions from the octahedrally coordinated and tetrahedrally coordinated Ni as well as the Ni 2p 1/2 , which has been previously reported. − Similarly, the Fe 2p scans can be deconvoluted into contributions from the octahedrally coordinated and tetrahedrally coordinated Fe. − Furthermore, in Figure d, the C 1s spectra is shown for the NFO/Gr sample. Deconvolution finds a large peak at 284.7 eV corresponding to the sp 2 -hybridized bonds of Gr, in excellent agreement with previously reported values, and which decays as the sample is milled into.…”

Section: Results and Discussionsupporting

confidence: 63%

Surface Termination-Enhanced Magnetism at Nickel Ferrite/2D Nanomaterial Interfaces: Implications for Spintronics

Schulz

Chanda

Datt

et al. 2023

ACS Appl. Nano Mater.

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Engineering of interfacial magnetic properties provides an extra edge in designing heterostructures with desired properties for spintronics and spincaloritronics, without drastically changing the structure of the neighboring nonmagnetic material. Here, we report on the surface termination-enhanced magnetic properties of the ferrimagnetic insulator (FMI) nickel ferrite (NFO) with the inclusion of graphene (Gr) and monolayer hexagonal boron nitride (hBN). Depth-dependent X-ray photoelectron spectroscopy (XPS) measurements reveal the presence of a layer of adsorbed oxygen at the NFO/Gr and NFO/hBN interfaces. Magnetometry and transverse susceptibility measurements indicate that the inclusion of monolayer Gr increases the saturation magnetization (M s ) by 40% and decreases the effective magnetic anisotropy by 50% across 5 K ≤ T ≤ 300 K. A similar but less pronounced effect is observed for the inclusion of hBN. Density functional theory calculations further indicate that the increase in M S due to the inclusion of Gr or hBN arises on oxygen-terminated NFO, as observed in XPS measurements. These results present ways for engineering strong interfacial magnetic effects in FMI/2D nanomaterial systems, controlling magnetism by surface termination, and developing advanced spinterfaces for applications in spincaloritronics and spin insulatronics.

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Section: Results and Discussionsupporting

confidence: 63%

Surface Termination-Enhanced Magnetism at Nickel Ferrite/2D Nanomaterial Interfaces: Implications for Spintronics

Schulz

Chanda

Datt

et al. 2023

ACS Appl. Nano Mater.

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“…Through analysis of the absorbance spectra obtained from the DRS measurements, the band gap values could be estimated. The observed absorption edges in the spectra indicated the initiation of electronic transitions within both the material and its composite 20 , 21 . The technique measures the diffused reflectance intensity as a function of incident photon wavelength.…”

Section: Resultsmentioning

confidence: 95%

Synergistic potential in spinel ferrite MFe2O4 (M = Co, Ni) nanoparticles-mediated graphene oxide: Structural aspects, photocatalytic, and kinetic studies

Parastar Gharehlar,

Sheshmani,

Nikmaram

et al. 2024

Sci Rep

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The existence of artificial dyes in water is a significant environmental concern, as it can lead to poor water quality. Photodegradation is becoming an increasingly popular method for treating water contaminated with dyes. In this study, the photodegradation of Reactive Red 66 and Reactive Red 120 dyes, as well as textile wastewater, was investigated under UV and visible light irradiation. To enhance the photoresponse of the MFe2O4 (M = Co, Ni) nanoparticles, modifications were made by incorporating graphene oxide. The MFe2O4 nanoparticles and MFe2O4/GO nanocomposite photocatalysts were subjected to several characterization techniques, including FT-IR, Raman spectroscopy, XRD, DRS, zeta potential, VSM, TGA, DSC, BET, SEM, and EDAX analysis. Experiments were conducted to optimize several key parameters involved in the photodegradation process, including pH, photocatalyst dosage, initial dye concentration, and irradiation time. The removal efficiency of Reactive Red 66 and Reactive Red 120 dyes using CoFe2O4 nanoparticles was found to be 86.97 and 82.63%, respectively. Also, the removal percentage of these dyes using CoFe2O4/GO nanocomposite photocatalyst was 95.57 and 90.9% for Reactive Red 66 and Reactive Red 120, respectively. Experiments found that NiFe2O4 nanoparticles removed 90.92% of Reactive Red 66 dye and 84.7% of Reactive Red 120 dye. The NiFe2O4/GO nanocomposite photocatalyst showed even higher removal efficiencies, degrading 97.96% of Reactive Red 66 and 93.44% of Reactive Red 120. After three days of exposure to visible light irradiation, the removal percentage of Reactive Red 66 using MFe2O4 and MFe2O4/GO nanocomposite was investigated.

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“…The analysis of Raman spectra of Ni-Zn ferrites confirmed the displacement of Fe 2+ ions due to substitution of Zn 2+ ions; the displacement of ions leads to interesting physical properties of the ferrite [6]. Recently Ni-Zn ferrites possessing interesting optical and electrical properties suitable for sensor applications were reported by Sankaranarayanan et al [7]. A long period for dielectric relaxation was reported for bulk Ni-Zn ferrite suggesting the ferrite as a promising candidate for future spintronic devices [8].…”

Section: Introductionmentioning

confidence: 82%

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

Jadhav

Ramshetti

et al. 2021

Cerâmica

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The spinel ferrite system Ni 1-x Zn x Fe 2 O 4 (x=0-0.7, Δx=0.1) was prepared by wet chemical co-precipitation method using sulfates of respective metal ions. The electrical resistivity and dielectric properties of the prepared samples have been studied as a function of temperature, frequency, and Zn content (x). The DC resistivity (ρ) was measured in the temperature range of 300 to 800 K. The curves so plotted show two phases viz. ferrimagnetic and paramagnetic, wherein the transformation from former to later phase took place at the Curie temperature, T C . The values of T C were found to decrease with the increase in x. The values of activation energy (ΔE<0.2 eV) depicted the possibility of the hopping mechanism governing the conduction within the ferrites. The ferrite samples exhibited semiconducting behavior, where the electrical resistivity (r) decreased with the increasing temperature. The dielectric constant (ε') and dielectric loss (ε") were studied as a function of composition, temperature, and frequency.

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Effect of Ni2+ and Fe3+ Ion Concentrations on Structural, Optical, Magnetic, and Impedance Response of NiFe2O4 Nanoparticles Prepared by Sol-Gel Process

Cited by 25 publications

References 26 publications

Surface Termination-Enhanced Magnetism at Nickel Ferrite/2D Nanomaterial Interfaces: Implications for Spintronics

Surface Termination-Enhanced Magnetism at Nickel Ferrite/2D Nanomaterial Interfaces: Implications for Spintronics

Synergistic potential in spinel ferrite MFe2O4 (M = Co, Ni) nanoparticles-mediated graphene oxide: Structural aspects, photocatalytic, and kinetic studies

Ferrimagnetic to paramagnetic transition and dielectric relaxation in Ni1-xZnxFe2O4 ferrites

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