Oxygen vacancy driven luminescence, ferromagnetic and electronic structure properties of Eu doped CeO2 nanoparticles

Leel, N.S.; Kiran, Mehwish; Kumawat, Manoj Kumar; Alvi, P. A.; Vats, V.S.; Patidar, Dinesh; Dalela, B.; Kumar, Shalendra; Dalela, S.

doi:10.1016/j.jlumin.2023.119981

Cited by 23 publications

(3 citation statements)

References 62 publications

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“…The registered spectra for the ceria-based samples are presented in Figure 4. The literature data reported that the energy of emitted photons due to the electron transitions from the 4f band to the valence band in CeO2 lies in the range of 3.0-3.8 eV [21]. The band centred at 364 nm, presented in all spectra, should be attributed to this transition.…”

Section: Resultsmentioning

confidence: 61%

“…The band centred at 364 nm, presented in all spectra, should be attributed to this transition. Also, it is reported that the emission bands located from 400 to 500 nm are attributed to some defects, such as vacancies or dislocations in CeO2 [21,55]. Therefore, the conclusive transitions from Ce 4f level to O 2p level due to abundant defects like O vacancies and dislocations are responsible for emission peaks from the 430 nm to 494 nm domains observed in all spectra.…”

Section: Resultsmentioning

confidence: 71%

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Enhancing the Photocatalytic Activity and Luminescent Properties of Rare-Earth-Doped CeO2 Nanoparticles

Toloman,

Popa,

Sonher

et al. 2024

Applied Sciences

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Our study is focused on the structural and morphological characteristics, optical behaviour and photocatalytic properties of undoped and 5 at% Eu3+-, Gd3+- and Y3+-doped CeO2 nanoparticles prepared by a green hybrid sol-gel combustion method. Several techniques such as X-ray diffraction powder (XRD), Transmission Electron Microscopy (TEM), UV-Vis spectroscopy, Photoluminescence spectroscopy (PL) and Electron Paramagnetic Resonance (EPR) have been used to investigate the obtained samples. Moreover, the correlation between the characteristics and properties has been studied. The nanoparticles observed by TEM exhibit a pseudo-spherical shape, except for Y3+-doped CeO2, which presents an acicular shape. The average size of undoped and rare-earth-doped CeO2 nanoparticles is below 10 nm, in good agreement with the calculations performed based on XRD analyses. From UV-Vis analyses it has been deduced that with doping the band gap energy decreases, which shows that additional levels are introduced by doping into the CeO2 band gap. The EPR spectra evidence similar behaviour for all doped samples. The photocatalytic activity was evaluated by the degradation of rhodamine B (RhB) under UV light irradiation. The photodegradation mechanism has been studied in depth based on the formation of electron-hole pairs, and to evidence the reactive oxygen species, ESR coupled with spin-trapping experiments was performed. In the case of Y-doped CeO2 nanoparticles, the generation of both •OOH and •O2− radicals involved in RhB photodegradation was highlighted.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 71%

Enhancing the Photocatalytic Activity and Luminescent Properties of Rare-Earth-Doped CeO2 Nanoparticles

Toloman,

Popa,

Sonher

et al. 2024

Applied Sciences

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“…The Ce 3d XPS spectra of xEu-CeO are presented in Figure 4 c. Due to the complex nature of spectra, it was necessary to apply a model that considered a multiplicity of 3d states originating from different Ce 4f level occupancies. The 10-component approach was chosen according to the articles of Paparazzo and Leel et al [ 32 , 33 ]. The Ce 3d 5/2 and Ce 3d 3/2 multiplets are labeled ‘v’ and ‘u’, respectively.…”

Section: Resultsmentioning

confidence: 99%

Influence of Eu3+ Doping on Physiochemical Properties and Neuroprotective Potential of Polyacrylic Acid Functionalized Cerium Oxide Nanoparticles

Meenambal,

Kruk,

Jakubowska

et al. 2024

IJMS

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Cerium oxide nanoparticles (CeONPs) exhibiting antioxidant properties are investigated as potential tools for neurodegenerative diseases. Here, we synthesized polyacrylic acid conjugated cerium oxide (CeO) nanoparticles, and further to enhance their neuroprotective effect, Eu3+ was substituted at different concentrations (5, 10, 15 and 20 mol%) to the CeO, which can also impart fluorescence to the system. CeONPs and Eu-CeONPs in the size range of 15–30 nm were stable at room temperature. The X-ray Photoelectron Spectroscopy (XPS) analysis revealed the chemical state of Eu and Ce components, and we could conclude that all Eu3+ detected on the surface is well integrated into the cerium oxide lattice. The emission spectrum of Eu-CeO arising from the 7F0 → 5D1 MD and 7F0 → 5D2 transitions indicated the Eu3+ ion acting as a luminescence center. The fluorescence of Eu-CeONPs was visualized by depositing them at the surface of positively charged latex particles. The developed nanoparticles were safe for human neuronal-like cells. Compared with CeONPs, Eu-CeONPs at all concentrations exhibited enhanced neuroprotection against 6-OHDA, while the protection trend of Eu-CeO was similar to that of CeO against H2O2 in SH-SY5Y cells. Hence, the developed Eu-CeONPs could be further investigated as a potential theranostic probe.

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Biosynthesis, Structural, Spectroscopic, Photoluminescence, and Antifungal Activity of Ni-doped CeO2 Nanoparticles

Lohitha,

Albert

2024

J Fluoresc

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Oxygen vacancy driven luminescence, ferromagnetic and electronic structure properties of Eu doped CeO2 nanoparticles

Cited by 23 publications

References 62 publications

Enhancing the Photocatalytic Activity and Luminescent Properties of Rare-Earth-Doped CeO2 Nanoparticles

Enhancing the Photocatalytic Activity and Luminescent Properties of Rare-Earth-Doped CeO2 Nanoparticles

Influence of Eu3+ Doping on Physiochemical Properties and Neuroprotective Potential of Polyacrylic Acid Functionalized Cerium Oxide Nanoparticles

Biosynthesis, Structural, Spectroscopic, Photoluminescence, and Antifungal Activity of Ni-doped CeO2 Nanoparticles

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