Oxygen vacancies and defects tailored microstructural, optical and electrochemical properties of Gd doped CeO2 nanocrystalline thin films

El-Habib, Abdellatif; Addou, M.; Aouni, A.; Diani, Mustapha; Zimou, J.; Bouachri, M.; Brioual, Bilal; Allah, Rabie Fath; Rossi, Zaid; Jbilou, Mohammed

doi:10.1016/j.mssp.2022.106631

Cited by 25 publications

(5 citation statements)

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“…The UV−visible spectrum of pristine and Prdoped CeO 2 showed the absorption below 400 nm, due to the charge transfer from O 2− 2p to Ce 4+ 4f orbitals in CeO 2 . 39 An estimate of the optical band gap E g was made by using the following equation for a semiconductor: 40…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The UV–visible spectrum of pristine and Pr-doped CeO 2 showed the absorption below 400 nm, due to the charge transfer from O 2– 2p to Ce 4+ 4f orbitals in CeO 2 . An estimate of the optical band gap E g was made by using the following equation for a semiconductor: false( α h ν false) n = C ( h ν − E normalg ) where α is the absorption coefficient, h is the photon energy, C is a constant, and n = 1/2 for an indirectly allowed transition. For the direct transition, the plots of (α h ν) 2 versus photon energy ( h ν) of Pr x Ce 1– x O 2 are shown in Figure D.…”

Section: Resultsmentioning

confidence: 99%

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Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Zou,

Wang,

2023

ACS Appl. Mater. Interfaces

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Zou,

Wang,

2023

ACS Appl. Mater. Interfaces

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“…The absorbance response depends on oxygen vacancies, impurity centers, surface roughness, and optical band gap. [ 35 ] An exponential curve is obtained for all three thin layers, where the peak of the plot is reached when the energy of the incident photon is equal to the absorption band gap energy, and a decay of the absorption is observed as the wavelength increases. Also, the absorption plots show a red shift for all Co‐doped Mn 3 O 4 thin layers compared to undoped Mn 3 O 4 .…”

Section: Resultsmentioning

confidence: 99%

Effect of Cobalt Doping on The Structural, Linear and Nonlinear Optical Parameters of Manganese Oxide Thin Layers

Rossi,

Ghannam,

Brioual

et al. 2023

Cryst. Res. Technol.

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In this study, undoped and cobalt‐doped manganese oxide Co:Mn3O4 (0, 2, and 4 at%) are elaborated by the spray pyrolysis procedure on glass substrates. The effect of cobalt doping concentrations on the structural, morphological, and optical features (linear and nonlinear) are investigated through the X‐ray diffractometer, Raman spectroscopy, Scanning Electron Microscopy with an attached energy dispersive X‐ray and UV–Vis‐NIR spectrophotometer. The XRD investigations exhibit a polycrystalline tetragonal structure for all Co:Mn3O4 and confirm by Raman results with the distinctive tetragonal mode A1g at 657 cm−1. The SEM images show an increase in roughness as cobalt doping concentration increases. The EDS quantitative analysis revealed the presence of manganese, oxygen, and cobalt. Furthermore, the optical investigation is pursued firstly through the linear optical that showed a decrease in the transmittance, and optical band gap energy as the cobalt concentration increased due to oxygen vacancies and defects and the increase of refractive index from 2.05 to 2.21. Second, the nonlinear optical parameters show a high value of the nonlinear refractive index 3.75 × 10−7 (esu) and the third‐order susceptibility χ3 = 2.2 × 10−8(esu) of Co:Mn3O4(2at%). These values put the Co:Mn3O4(2at%) thin layer as a candidate in the optoelectronic applications as a third‐order nonlinear medium.

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“…al. [68] presented Gd-doped CeO2 nanocrystalline thin films using spray pyrolysis and reported that the peak asymmetry and broadening of Raman spectra could be attributed to the existence of an oxygen vacancy and Ce 3+ , which changed with the addition of Gd 3+ . With a gradual increase in crystal size, there may be a simultaneous enhancement of defects in the thin film and the growth of other The root mean square values of the surface roughness (R q ) of 10-GDC fluctuated with the annealing temperature and had a maximum value of 18.08 nm at 600 • C, with the lowest value of 11.32 nm for as-evaporated films.…”

Section: Characterization Of Thin Filmsmentioning

confidence: 99%

Section: Characterization Of Thin Filmsmentioning

confidence: 99%

Synthesis and Electron-Beam Evaporation of Gadolinium-Doped Ceria Thin Films

et al. 2022

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Gadolinium-doped ceria (GDC) nanopowders, prepared using the co-precipitation synthesis method, were applied as a starting material to form ceria-based thin films using the electron-beam technique. The scanning electron microscopy (SEM )analysis of the pressed ceramic pellets’ cross-sectional views showed a dense structure with no visible defects, pores, or cracks. The AC impedance spectroscopy showed an increase in the total ionic conductivity of the ceramic pellets with an increase in the concentration of Gd2O3 in GDC. The highest total ionic conductivity was obtained for Gd0.1Ce0.9O2-δ (σtotal is 11 × 10−3 S∙cm−1 at 600 °C), with activation energies of 0.85 and 0.67 eV in both the low- and high-temperature ranges, respectively. The results of the X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical emission spectrometer (ICP-OES) measurements revealed that the stoichiometry for the evaporated thin films differs, on average, by ~28% compared to the target material. The heat-treatment of the GDC thin films at 600 °C, 700 °C, 800 °C, and 900 °C for 1 h in the air had a minor effect on the surface roughness and the morphology. The results of Raman spectroscopy confirmed the improvement of the crystallinity for the corresponding thin films. The optimum heat-treating temperature for thin films does not exceed 800 °C.

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Oxygen vacancies and defects tailored microstructural, optical and electrochemical properties of Gd doped CeO2 nanocrystalline thin films

Cited by 25 publications

References 42 publications

Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Effect of Cobalt Doping on The Structural, Linear and Nonlinear Optical Parameters of Manganese Oxide Thin Layers

Synthesis and Electron-Beam Evaporation of Gadolinium-Doped Ceria Thin Films

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Oxygen vacancies and defects tailored microstructural, optical and electrochemical properties of Gd doped CeO2 nanocrystalline thin films

Cited by 25 publications

References 42 publications

Defect-Engineered Charge Transfer in a PtCu/PrxCe1–xO2 Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Defect-Engineered Charge Transfer in a PtCu/PrxCe1–xO2 Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Effect of Cobalt Doping on The Structural, Linear and Nonlinear Optical Parameters of Manganese Oxide Thin Layers

Synthesis and Electron-Beam Evaporation of Gadolinium-Doped Ceria Thin Films

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Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions

Defect-Engineered Charge Transfer in a PtCu/Pr_xCe_1–xO₂ Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions