Synthesis and characterization of non-stoichiometric cobalt nanoferrites for multifunctional applications

Ateia, Ebtesam E.; AL-Hamzi, Abdulalah; Hussein, B.

doi:10.1007/s10854-022-08876-5

Cited by 7 publications

(5 citation statements)

References 51 publications

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“…The first major one (Fe 2p 3/2 ) is deconvoluted into two peaks located at 710.4 and 712.8 eV, corresponding to the presence of mixed oxidation states Fe 2+ /Fe 3+ , respectively. Also, three satellite peaks are detected at 716.6, 719.7 and 723.5 eV, which are inconsistent with the mixed oxidation states Fe 2+ and Fe 3+ [44].…”

Section: Xps Analysismentioning

confidence: 76%

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

2023

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An effective combustion technique is used to synthesize Sr0.8La0.2Fe12-xCuxO19 (x = 0,1) M-type strontium hexagonal ferrite nanoparticles (SHFNPs). The impact of La and La-Cu substitution on the structural, microstructural, and magnetic characteristics of SHFNPs is scrutinized. The samples are characterized using several experimental techniques, such as X-ray diffraction (XRD), Raman spectroscopy (RS), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and vibrating sample magnetometer (VSM). The obtained results reveal that the single lattice structure of the substituted strontium hexaferrite can be acquired by transforming Fe3+ to Fe2+ on the 2a site. Raman spectroscopy (RS) verifies the formation of all crystallographic sites of hexaferrite. The broadening of 4f2 and 12k peaks indicates the presence of disorder at the crystal sites resulting from the change in the chemical environment after doping with Cu2+ ions. FESEM images reveal flat hexagonal facets of the particle that signify the magneto-plumbite structure. The magnetic results provide high values of both intrinsic coercivity and (BH)max. The obtained data constitute good magnetic characteristics for perpetual magnet applications. Furthermore, the reduced coercivity of the Sr0.8La0.2Fe11CuO19 (SLCHF) sample with high magnetizations can be used to create microwave absorbing and data storage materials.

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Section: Xps Analysismentioning

confidence: 76%

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

2023

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“…6d) can be deconvoluted into four component peaks. The oxide species (O 2− ) are accountable for the observed component peaks at 529.63 and 531.42 eV, where the peroxide species are responsible for the peak component at 532.24 eV 30,31 . At 533.13 eV 35,36 , the OH-group can be assigned to the component.…”

Section: Resultsmentioning

confidence: 97%

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

Ateia

Arman

Mohamed

2023

Sci Rep

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Bi-functional nano-oxides are of growing interest to address environmental issues. In the present study, the structural and magnetic data are presented together with the antimicrobial activities (AMA). For the first time, silver delafossite oxide (AgCuO2) is successfully fabricated using a simple, low-cost technique to target antibiotic photodegradation and inactivation of model waterborne pathogens. It is prepared with an equimolar initial Ag+:Cu+ concentration ratio. The structure, morphology, and magnetic properties are studied by different characterization techniques. The size and shape of AgCuO2 NPs, in addition to their structural polytypes of 2H (hexagonal) or 3R (rhombohedral), are dependent on the preparation conditions. The existence of Cu, Ag, and O in the synthesized delafossite AgCuO2 NPs with no evidence of any impurity is ratified by the XPS spectrum. AFM measurements are taken to characterize the surface morphologies of AgCuO2. The distributed spiks are evaluated by roughness kurtosis (Rku). The roughness kurtosis has a value of 2.65 (< 3), indicating that the prepared sample is classified as bumpy. The prepared sample has 13.0, 10.0, 14.0, and 14.0 mm Inhibition Zone Diameter (IZD) antimicrobial activity against gram-positive Bacillus subtilis (B. subtilis), Bacillus cereus (B. cereus), Enterococcus faecalis (E. faecalis), and Staphylococcus aureus (S. aureus), respectively. The IZD for gram-negative Escherichia coli (E. coli), Neisseria Gonorrhoeae (N. Gonorrhoeae), Pseudomonas aeruginosa (P. aeruginosa), and Salmonella typhimrium (S. typhimrium) were found to be 12.0, 13.0, 14.0, and 13.0 mm, respectively. Therefore, the AgCuO2 NPs reveal excellent antimicrobial efficiency, and they can be effortlessly separated using a tiny magnet or a simple magnetic separator. The adequate cytotoxicity and magnetic characteristics of the antimicrobial sample suggest a promising future for it in biomedical applications.

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“…Based on the EDAX spectra, it can be inferred that Cu, Zn, and O are the constituent elements of the CuZnO 2 sample (see figure 5 There are several factors that can explain the discrepancy between the initial stoichiometric ratio and the predicted weight percentage of the prepared samples. These factors include their impact on the intensity, natural width, and energy resolution of distinct x-ray lines [41]. The mentioned factors could be affecting the amount of each element in a specific structure, including the distribution of the elements and the type of measurements (dots, line, and area).…”

Section: Energy-dispersive X-ray Spectroscopy Analysis (Edax) and Map...mentioning

confidence: 99%

“…Roughness kurtosis is used to estimate the distribution of spikes above and down the mean line/plane. Rku >3; indicates spiky surfaces, while Rku <3; indicates bumpy surfaces, perfectly random surfaces have a kurtosis of 3 [41]. Consequently, the prepared samples are classified as bumpy surfaces.…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Comparative study of the structural, magnetic and electrical properties of cuprous delafossites CuBO₂(B = Zn, Mn and Er) prepared using the flash auto-combustion technique

Ateia,

Soliman,

Morsy

2024

Phys. Scr.

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The flash auto-combustion method was utilized to produce Cu-based delafossites of CuBO2 (B = Zn, Mn, and Er). X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS) were employed to verify the phase formation, surface morphology, and oxidation states of the synthesized delafossite samples. The crystallite sizes were determined to be 43, 16.76, and 21.66 nm for CuZnO2, CuMnO2, and CuErO2 nanoparticles (NPs), respectively. The magnetic characteristics of CuZnO2, CuMnO2, and CuErO2 samples were studied at room temperature, revealing their paramagnetic nature through the hysteresis effect. The Seebeck coefficient (S) for CuZnO2 was found to be positive, while it was negative for CuMnO2 and CuErO2. The thermoelectric power of CuZnO2 NPs was high, indicating their potential as materials for more efficient thermoelectric devices. Additionally, CuZnO2 exhibited an antimicrobial response against four-gram (+ve) bacteria, four-gram (-ve) bacteria, and the fungus Candida albicans (CA). The data obtained demonstrated that CuZnO2 NPs altered bacterial cell morphology, ultimately leading to bacterial cell death.

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Synthesis and characterization of non-stoichiometric cobalt nanoferrites for multifunctional applications

Cited by 7 publications

References 51 publications

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

Comparative study of the structural, magnetic and electrical properties of cuprous delafossites CuBO₂(B = Zn, Mn and Er) prepared using the flash auto-combustion technique

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Synthesis and characterization of non-stoichiometric cobalt nanoferrites for multifunctional applications

Cited by 7 publications

References 51 publications

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

Multi-susceptible single-phased hexaferrite with significant magnetic switching properties by selectively doping

A facile novel synthesis of AgCuO2 delafossite nanoparticles and evaluation of their antimicrobial activity

Comparative study of the structural, magnetic and electrical properties of cuprous delafossites CuBO2(B = Zn, Mn and Er) prepared using the flash auto-combustion technique

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Comparative study of the structural, magnetic and electrical properties of cuprous delafossites CuBO₂(B = Zn, Mn and Er) prepared using the flash auto-combustion technique