Structural and optical characteristics of cobalt ferrite nanoparticles

Jeevanantham, B.; Song, Young-Gyun; Choe, Heeman; Shobana, M.K.

doi:10.1016/j.mlblux.2021.100105

Cited by 13 publications

(5 citation statements)

References 20 publications

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“…[20,30]. When cobalt ferrite particles are added, absorption peaks due to the stretching vibration of the metal-oxygen bonds at the tetrahedral and octahedral sites is visible between 500 and 700 cm − 1 , which is in clear agreement with the XRD crystal structure, and the above bands are well matched with the literature [31]. With increase in the ller concentration in the polymer matrix, there is an increase in the -phase intensity along with a decrease in the α-phase intensity.…”

Section: Ft-ir Spectroscopysupporting

confidence: 86%

Structural, spectral and dielectric properties of PVDF-HFP/Cobalt ferrite composite films

Gunti,

Simhachalam,

Pola

2023

Preprint

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PVDF-HFP/CFO composite films consisting of a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) copolymer as the ferroelectric matrix and cobalt ferrite (CoFe2O4, CFO) nanoparticles as the ferromagnetic component were fabricated using a solution casting method. The CFO nanoparticles were synthesized using the coprecipitation approach, followed by calcination at a temperature of 850°C to obtain the pure phase. To fabricate PVDF-HFP/CFO composite films, CFO nanoparticles were loaded into PVDF-HFP with different weight % values ranging from 5, 10, 15, 20, 25, 30 and 40.The fabricated PVDF-HFP/CFO composite films were subjected to analysis in terms of their structural, morphological, spectral and dielectric properties. The CFO phase formation and its loading in composites was characterized using X-ray diffraction (XRD), while the surface morphology of the synthesized compounds was analyzed using scanning electron microscopy (SEM).The XRD analysis suggested the presence of the \(\beta\)-phase in PVDF-HFP as well as in the composites. The SEM micrographs revealed the spherulite morphology of the PVDF-HFP/CFO composites. The Fourier transform-infrared spectroscopy (FT-IR) measurement results displayed the presence of the \(\beta\)-phase, and the peak related to the \(\beta\)-phase showed an increase upto 20% CFO loading, which also reflects the enhancement of the dielectric constant. UV-Visible absorption spectra were employed to find the direct bandgap energy of the polymer composites using Tauc’s relation. The room temperature dielectric constant measurements displayed a dielectric constant value of 9.5 (PVDF-HFP), which increased to 80.82 (20% CFO-loaded composite) and later decreased as the CFO loading increased. The results were discussed in detail.

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Section: Ft-ir Spectroscopysupporting

confidence: 86%

Structural, spectral and dielectric properties of PVDF-HFP/Cobalt ferrite composite films

Gunti,

Simhachalam,

Pola

2023

Preprint

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“…The deconvoluted peaks of Co-2p contain the spin-orbit doublets of Co-2p 3/2 and Co-2p 1/2 associated by satellite peaks, as shown in figure 8(b). The two de-convoluted peaks of Co-2p 3/2 attribute to Co 2+ in the octahedral (O h ) and tetrahedral (T d ) sites [102]. Moreover, the core spectra of Mg-1 s in figure 8(c) indicate the presence of a single peak at around 1303 eV in samples F and C, and around 1305 eV in sample A, which is related to Mg 2+ ions [103,104].…”

Section: Xps Studymentioning

confidence: 93%

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

El Hajjar,

Bitar,

Zahr

et al. 2024

Mater. Res. Express

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Zn0.33Co0.33Mg0.33X2O4 nanoparticles (NPs), where X = Fe, Cr, Al and denoted by F, C, and A, were prepared by the co-precipitation method. X-ray diffraction patterns validated the formation of NPs with cubic spinel structure with the detection of small amounts of impurities in samples C (Cr2O3) and A (MgO). Transmission electron micrographs showed a nearly spherical shape for samples F and A. However, sample C revealed cubic and nearly spherical shapes. Energy-dispersive x-ray analysis ensured the presence of chemical constituents in all samples. The vibrational modes of NPs were confirmed with Fourier transform infrared spectroscopy. The direct bandgap energy values, calculated using ultraviolet-visible spectroscopy, were in the range of 2.355 and 2.967 eV for F, C, and A samples. X-ray photoelectron spectroscopy analysis confirmed the compositions as well as the valence states of all elements. Magnetic hysteresis (M–H) loops revealed a soft ferromagnetic behavior. Sample F exhibited a higher saturation magnetization, remanent magnetization, magnetic moment, and magnetic anisotropy compared to those of samples C and A. The antibacterial activity of the tested samples against four bacteria (Staphylococcus aureus, Stenotrophomonas maltophilia, Escherichia coli, and Enterococcus faecium) was determined using the broth microdilution assay, minimum bactericidal concentration (MBC), and time-kill test. The prepared NPs exhibited varying antibacterial activity due to multiple factors. These results highlighted the potential utility of the ternary ferrite, chromite, and aluminate NPs in the treatment of microbial infections, particularly multidrug-resistant bacteria.

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“…In contrast, Co II and Fe III are randomly dispersed when the material is synthesized as a nanostructured material (γ = 0.66). In the literature, the inversion degree of nanostructured CoFe 2 O 4 prepared using various methods was measured using different techniques ( 57 Fe-Mössbauer spectroscopy, EXAFS, neutron diffraction), and the values ranged from 0.68 to 0.76 [ 48 , 49 , 50 , 51 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Design of a Novel Nanosensors Based on Green Synthesized CoFe2O4/Ca-Alginate Nanocomposite-Coated QCM for Rapid Detection of Pb(II) Ions

et al. 2022

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Pb(II) is a significant contaminant that is known to have negative effects on both humans and animals. Recent industrial operations have exacerbated these consequences, and their release of several contaminants, including lead ions, has drawn attention to the potential effects on human health. Therefore, there is a lot of interest in the rapid, accurate, and selective detection of lead ions in various environmental samples. Sensors-based nanomaterials are a significant class among the many tools and methods developed and applied for such purposes. Therefore, a novel green synthesized cobalt ferrite (CoFe2O4) nanoparticles and functionalized CoFe2O4/Ca-alginate nanocomposite was designed and successfully synthesized for the fabrication of nanoparticles and nanocomposite-coated quartz crystal microbalance (QCM) nanosensors to detect the low concentrations of Pb(II) ions in the aqueous solutions at different temperatures. The structural and morphological properties of synthesized nanoparticles and nanocomposite were characterized using different tools such as X-ray diffraction (XRD), N2 adsorption–desorption isotherm, dynamic light scattering (DLS), zeta potential analyzer (ζ-potential), atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The QCM results revealed that the green synthesized CoFe2O4 nanoparticles and functionalized CoFe2O4/Ca-alginate nanocomposite-coated QCM nanosensors exhibited high sensitivity, stability, and rapid detection of Pb(II) ions in the aqueous solutions at different temperature. The lowest detection limit for Pb(II) ions in the aqueous solutions could reach 125 ng, which resulted in a frequency shift of 27.49 ± 0.81, 23.63 ± 0.90, and 19.57 ± 0.86 Hz (Δf) for the QCM detector coated with green synthesized CoFe2O4 nanoparticles thin films, and 25.85 ± 0.85, 33.87 ± 0.73, and 6.87 ± 0.08 Hz (Δf) for the QCM detector coated with CoFe2O4/Ca-Alg nanocomposite thin films in a real-time of about 11, 13, and 13 min at 25 °C, 35 °C, and 45 °C, respectively. In addition, the resonance frequency change results showed the superiority of functionalized CoFe2O4/Ca-alginate nanocomposite coated QCM nanosensor over CoFe2O4 nanoparticles towards Pb(II) ions detecting, which attributed to the beneficial properties of alginate biopolymer.

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Structural and optical characteristics of cobalt ferrite nanoparticles

Cited by 13 publications

References 20 publications

Structural, spectral and dielectric properties of PVDF-HFP/Cobalt ferrite composite films

Structural, spectral and dielectric properties of PVDF-HFP/Cobalt ferrite composite films

Fabrication, characterization, and antibacterial activity of ferrite, chromite, and aluminate nanoparticles

Design of a Novel Nanosensors Based on Green Synthesized CoFe2O4/Ca-Alginate Nanocomposite-Coated QCM for Rapid Detection of Pb(II) Ions

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