Structural, optical and magnetic properties of pure and rare earth-doped NiO nanoparticles

Boukhari, J. Al; Khalaf, A.; Hassan, R. Sayed; Awad, R.

doi:10.1007/s00339-020-03508-3

Cited by 50 publications

(41 citation statements)

References 67 publications

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“…The obtained slight lattice expansion agrees with the previous report; however, we did not see any peak splitting (Figure b) . Contrary to the above observation, a contraction has also been reported from Ni 98 Sm 2 O NPs. , The ionic radius of Sm 3+ (109.8 pm) is much larger than that of Ni 2+ (83 pm), which justifies the obtained lattice expansion and suggests that Sm-doping up to 0.5–1% possibly leads to substitution of Ni 2+ ions with Sm 3+ . The above finding is consistent with the observed very weak diffraction peak (marked with “*”) of the Sm 2 O 3 phase for the 2–5% samples .…”

Section: Resultssupporting

confidence: 90%

“…Recently, the rare earth (RE)-doped TMO has attracted immense research interest from both fundamental and application points of view as a dielectric, for biomedical near-infrared and magnetic resonance imaging, optoelectronics, and magnetic, optical, and electrical properties. − RE elements are known to significantly improve the host material’s electrical and magnetic properties if doped at an appropriate concentration. This is due to incompletely filled 4f orbits shielded by 5s 2 and 5p 6 orbits, large ionic radii that cause a lattice distortion, change in the ionic state, and reduced crystalline size of the host sample .…”

Section: Introductionmentioning

confidence: 99%

“…This is due to incompletely filled 4f orbits shielded by 5s 2 and 5p 6 orbits, large ionic radii that cause a lattice distortion, change in the ionic state, and reduced crystalline size of the host sample . To the best of the author’s knowledge, the NiO structural deformation under RE Sm incorporation and its magnetic properties are barely covered in the literature …”

Section: Introductionmentioning

confidence: 99%

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Sm-Doped NiO Nanoparticles for Magnetic Memory at Room Temperature

Gandhi

Tummala

Chiu

et al. 2021

ACS Appl. Nano Mater.

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The search for diluted magnetic semiconductors (DMSs) has gained immense research interest because of the coexistence of the charge and spin degree of freedom in a single substance to realize a particular class of spintronic devices, and a rare earth (RE)-doped transition-metal oxide (TMO) is one of the choices. This study intends to understand the effect of RE Sm 3+ ion substitution in antiferromagnetic (AF) NiO nanoparticles (NPs) using modern cutting-edge techniques (synchrotron powder X-ray diffraction and soft X-ray absorption, Raman scattering, and superconducting quantum interference device magnetometry). A percolation threshold limit of about 1% incorporation of Sm 3+ ions at the Ni 2+ site was evident. An enhanced magnetic moment observed for an intermediate composition has been attributed to the interacting bound magnetic polaron. A core−shell model has been proposed such that the multivalent point defects reside at the surface of NPs, whereas the core of the particles retains AF properties. The exchange coupling mediated by interfacial frozen spins is the leading mechanism behind the magnetic memory effect at room temperature. The outcome of this study is vital for the future development of RE-functionalized TMO DMS spintronic devices and the understanding of their fundamental physics and chemistry.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sm-Doped NiO Nanoparticles for Magnetic Memory at Room Temperature

Gandhi

Tummala

Chiu

et al. 2021

ACS Appl. Nano Mater.

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“…This pattern of response is witnessed in nanoparticles for the spinning moments in terms of energy barrier which is reliant on the surface area as ∆𝐸 = 𝐾 𝑠 𝑆 where𝑆and 𝐾 𝑠 refers to the surface area of nanoparticles and surface anisotropy constant respectively. This phenomenon is accountable for an increase in coercivity as𝐻 𝑐 ~ 1 𝐷 [69].…”

Section: Magnetic Propertiesmentioning

confidence: 94%

Revealing the Substitution of Zn2+ on Nano-Structural, Magneto-Electrical, Antibacterial and Antifungal Attributes of Nickel Oxide Nanoparticles via Sol-Gel Strategy

Aslinjensipriya¹,

R²,

Ragu³

et al. 2022

Preprint

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Transition metal oxides have gathered momentum among the scientific community on account of their peculiar procession in physico-chemical, opto-electronic, magnetic, electrochemical, and biological attributes resulting from anisotropic charge distribution of partly filled d-orbitals, non-stoichiometric behaviour, and diverse oxidation states of the cations. The current work emphasize on the systematic synthesis and characterization of pure and zinc (Zn) incorporated nickel oxide (NiO) nanoparticles in varying concentrations ZnxNi1−xO (x = 0, 0.1, 0.2, and 0.3) via a scalable sol-gel approach assisting citric acid (C6H8O7) as a congealing factor. A series of extensive analyses were executed to investigate the structural, opto-electrical, and magnetic characteristics of prepared nanoparticles. X-Ray Diffraction (XRD) studies confirmed the face-centered cubic structure of as-synthesized samples and the corresponding crystallite size is found to decrease with an increasing dopant concentration as estimated from the Scherrer method. Scanning electron microscopy studies portrayed the spherical structure and porous nature of NiO nanoparticles. Particle size calculated from SEM shows the decreasing trend with dopant discrepancy which is in accordance with crystallite size measured from XRD results. Energy Dispersive X-ray (EDX) spectra revealed the presence of estimated molecular assembly in synthesized samples. The cubic configuration and the presence of functional groups existing in synthesized nanoparticles were endorsed from Fourier Transform Infra-Red (FTIR) spectra. The optical absorption spectrum examined from UltraViolet-visible (UV-vis) spectroscopy evaluates the energy bandgap and it is noticed to increase from 2.48 to 2.87 eV affirming the Burstein Moss shift. The energy dispersion of optical parameters plays a crucial contribution in optical materials pursuant to its prominence in optical communications and in fabricating novel devices for spectral dispersion. Optical and energy dispersion parameters evaluated from Wemple-DiDomenico (WDD) model and non-linear optical parameters were deliberated from optical studies. Urbach energy and another pivotal optical criterion highly correlated with the bandgap energy anchored in the fabrication of optoelectronic devices were assessed. The electrical characteristics such as dielectric constant, loss, and conductivity exhibited by pure and Zn doped nickel oxide nanoparticles were reported. Molecular electronic polarizability assessed through elementary solid-state parameters is in better concurrence with diverse relations like Clausius-Mossotti, Lorentz-Lorent, bulk modulus, optical electronegativity, energy band gap. The pore size distribution of substance matrix and the associated surface area were elucidated from Brunauer-Emmett-Teller (BET) analysis. Dispersive magnetic properties and two pivotal parameters were derived from the Law of Approach to Saturation (LAS) operandi. Further, microbial cell mechanism was illustrated through nano-architecture design, and the antibacterial and antifungal activity encountered by undoped and zinc doped NiO nanoparticles against different microbial strains were deeply discussed for pilot production of antimicrobial agents.

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“…Al Boukhar et al, found a modest blue shift in the optical spectra of Re-doped NiO samples when compared to pure NiO, implying that the optical bandgap has increased. They are investigating the magnetic characteristics of NiO nanoparticles at room temperature and have shown that antiferromagnetic and weak ferromagnetic ordering coexists in both pure and RE 3+ -doped NiO nanoparticles [29]. The addition of Mn to the NiO lattice increases the magnetic characteristics substantially, according to Samar and Verma [30].…”

Section: Introductionmentioning

confidence: 99%

Thermal-Induced Effects on the Structural and Photocatalytic Properties of Nickel Oxide Nanoparticles for Indigo Carmine Dye Removal

Abd‐Elnaiem

Hakamy

Ibrahem

et al. 2022

J Inorg Organomet Polym

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In this study, NiO nanoparticles were formed using the chemical precipitation method, and the calcination process induced structural parameters and optical bandgap. The research was carried out using a variety of techniques such as XRD, FTIR, and SEM. The XRD analysis reveals that the formed NiO crystallized in an fcc crystal structure, and that the calcination process in uences the microstrain, dislocation density, and average surface area. The optical bandgap and crystal structure parameters are signi cantly affected by increasing the calcination temperature and/or time. The formation of a Ni-O stretching vibration mode is revealed by FTIR, and the broadness of the absorption band con rms that the NiO samples are nanocrystals. The morphology of the prepared NiO reveals the formation of spherical nanoparticles for samples calcined at 700 °C and dodecahedron-like shapes for samples calcined at 800 and 900 °C. Depending on the calcination temperature and time, the optical band gap ranged from 3.33 to 3.71 eV. The photocatalytic performance of NiO nanoparticles as catalysts for the degradation of indigo carmine (IC) dye is investigated under UV-visible irradiation for up to 3 h. The best degradation e ciency was found to be 76% for NiO calcined at 800 °C for 4 h, which revealed the smallest crystallite size of 19.13 nm, and the highest surface area of 47.02 m 2 /g. A mechanism for the degradation process was proposed, and the reaction rate constants for various NiO catalysts were estimated, with the maximum value of 4.51×10 -3 /min calculated for NiO calcined at 800 °C for 4 h.

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Structural, optical and magnetic properties of pure and rare earth-doped NiO nanoparticles

Cited by 50 publications

References 67 publications

Sm-Doped NiO Nanoparticles for Magnetic Memory at Room Temperature

Sm-Doped NiO Nanoparticles for Magnetic Memory at Room Temperature

Revealing the Substitution of Zn2+ on Nano-Structural, Magneto-Electrical, Antibacterial and Antifungal Attributes of Nickel Oxide Nanoparticles via Sol-Gel Strategy

Thermal-Induced Effects on the Structural and Photocatalytic Properties of Nickel Oxide Nanoparticles for Indigo Carmine Dye Removal

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