Structural, morphological, optical, and electrochemical properties of Co-doped CeO2 thin films

Zimou, J.; Nouneh, Khalid; Hsissou, Rachid; El-Habib, Abdellatif; Gana, L. El; Talbi, A.; Beraich, M.; Lotfi, N.; Addou, M.

doi:10.1016/j.mssp.2021.106049

Cited by 42 publications

(13 citation statements)

References 51 publications

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“…A clear peak around 450 cm −1 can be observed in all samples, depicting the primary F 2g mode, which is associated with the symmetrical stretching/breathing mode of O atoms around Ce cations. 25 As one can see, the pure CeO 2 samples have higher intensity in this mode, and the lack of any other mode indicates a highly symmetric system in both short-and longrange orders. This mode is very sensitive to any disturbance of the oxygen sublattice, 26 verified by the clear decrease in its intensity when the system started to be doped.…”

Section: Resultsmentioning

confidence: 84%

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

et al. 2023

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The influence of manganese modification on the spectroscopic features of manganese-doped CeO 2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified, focusing on their interaction with poisonous atmospheres. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn 2+ signal, likely due to the reduction of Mn 3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed the pure system with 33% of its cerium species in the Ce 3+ configuration, with an abrupt decrease to 19%, after the first modification with Mn, suggesting that 14% of the Ce 3+ species are donating one electron to the Mn 2+ ions, thus becoming nonparamagnetic Ce 4+ species. On the contrary, 58% of the manganese species remain in the Mn 2+ configuration with five unpaired electrons, corroborating the paramagnetic feature of the samples seen in the electron paramagnetic resonance study.

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Section: Resultsmentioning

confidence: 84%

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

et al. 2023

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“…Raman spectra of the ESM and Ce-ESM (Figure 1e) showed that the Ce-ESM had an intense band at 462 cm −1 corresponding to the symmetrical vibration of the oxygen atoms around the cerium atoms. 22 X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) were, respectively, performed to investigate the crystallinity of cerium oxide, the distribution of the cerium valence state, and the degree of mineralization. The XRD spectrum of the Ce-ESM displayed blunt peaks instead of the narrow peaks seen in pristine ESM (Figure 1f).…”

Section: Resultsmentioning

confidence: 99%

“…These carboxyl groups can chelate with cerium to facilitate infiltration and mineralization of cerium oxide. Raman spectra of the ESM and Ce-ESM (Figure e) showed that the Ce-ESM had an intense band at 462 cm –1 corresponding to the symmetrical vibration of the oxygen atoms around the cerium atoms …”

Section: Resultsmentioning

confidence: 99%

Smart, Biomimetic Periosteum Created from the Cerium(III, IV) Oxide-Mineralized Eggshell Membrane

Wan

Jiao

et al. 2022

ACS Appl. Mater. Interfaces

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The periosteum orchestrates the microenvironment of bone regeneration, including facilitating local neuro-vascularization and regulating immune responses. To mimic the role of natural periosteum for bone repair enhancement, we adopted the principle of biomimetic mineralization to delicately inlay amorphous cerium oxide within eggshell membranes (ESMs) for the first time. Cerium from cerium oxide possesses unique ability to switch its oxidation state from cerium III to cerium IV and vice versa, which provides itself promising potential for biomedical applications. ESMs are mineralized with cerium(III, IV) oxide and examined for their biocompatibility. Apart from serving as physical barriers, periosteum-like cerium(III, IV) oxide-mineralized ESMs are biocompatible and can actively regulate immune responses and facilitate local neuro-vascularization along with early-stage bone regeneration in a murine cranial defect model. During the healing process, cerium-inlayed biomimetic periosteum can boost early osteoclastic differentiation of macrophage lineage cells, which may be the dominant mediator of the local repair microenvironment. The present work provides novel insights into expanding the definition and function of a biomimetic periosteum to boost early-stage bone repair and optimize long-term repair with robust neuro-vascularization. This new treatment strategy which employs multifunctional bone-and-periosteum-mimicking systems creates a highly concerted microenvironment to expedite bone regeneration.

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“…The peak at 513 cm −1 disappears, and the peak absorption in the region of 240-250 cm −1 appears, probably, due to the formation of the additional phases Ti2O3, and β-TiO2 [21]. The most intense band is shifted in the high-frequency side from 143 to 154 cm −1 compared to TiO2, while its half-width (FWHM) increases from 10 to 25 cm −1 compared to [23]. It is the lattice deformation, and reduction in the size of crystallites and nanoparticles [21] that have a strong influence on the shear, and expansion of the peaks as in studies [27,30,32].…”

Section: Raman Spectroscopy Studymentioning

confidence: 97%

“…Nanosized CeO 2 powders crystallize in a cubic fluorite structure (crystal system Fm3m), which is described at 458 cm −1 and corresponds to the OH 5 space group (F2g symmetry) and one infrared-active optical phonon (symmetry F1u), which has either LOor TO-character, corresponding to different wave numbers [22,23]. Thus, it can be seen that each cerium ion (Ce 4+ ) is coordinated by eight oxygen ions (O 2− ).…”

Section: Raman Spectroscopy Studymentioning

confidence: 99%

Nanocomposites Based on Cerium, Lanthanum, and Titanium Oxides Doped with Silver for Biomedical Application

et al. 2022

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Nanosized composites CeO2–Ag, La2O3–Ag, and TiO2–Ag are a class of nanomaterials suitable for photocatalysis, optical devices, and photoelectrochemical elements. Further, nanocomposites with several wt.% of silver can be used as creating materials for pathogenic virus inactivation with pandemic-neutralizing potential. Thus, CeO2–Ag, La2O3–Ag, and TiO2–Ag nanocomposites are prospective materials due to their optical and biological activity. In the present work, CeO2–Ag, La2O3–Ag, and TiO2–Ag nanocomposites were synthesized by the co-precipitation method. The morphological and optical properties and the structure of the prepared nanocomposites were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM) with EDX, and nitrogen adsorption-desorption based on BET, Raman spectroscopy, and photoluminescence (PL). Both oxide matrixes corresponded to the cubic crystal lattice with the inclusion of argentum into the crystal lattice of oxides at relative low c(Ag) and reduction of silver on particle surface at 5 wt.% Ag and greater. The CeO2, TiO2, and La2O3 with a concentration of 4 wt.% Ag inhibited the growth processes of prokaryotic cells of E. coli, Bacillus sp., and S. aureus compared to pure oxides. Influenza A virus and herpes completely suppressed reproduction by nanocomposites of CeO2–Ag (2, 5 wt.%) and La2O3–Ag (2, 5 wt.%) action.

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Structural, morphological, optical, and electrochemical properties of Co-doped CeO2 thin films

Cited by 42 publications

References 51 publications

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

Smart, Biomimetic Periosteum Created from the Cerium(III, IV) Oxide-Mineralized Eggshell Membrane

Nanocomposites Based on Cerium, Lanthanum, and Titanium Oxides Doped with Silver for Biomedical Application

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