Magnetic and electronic structures of Co ion implanted CeO2 thin films

Kumar, Pawan; Ahmad, Bilal; Chand, Fakir; Asokan, K.

doi:10.1016/j.apsusc.2018.04.263

Cited by 27 publications

(8 citation statements)

References 47 publications

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“…However, it is noticeable that at higher fluences, there is a significant reduction in the peak intensity owing to the amorphization nature of the implanted thin film. Similar outcomes were detailed by Pawan et al using Co ion implanted ceria thin films [21]. The full width at half maximum (FWHM) values are found to increase with increasing ion fluence up to sample Fe 1E15 and then decrease for higher fluences (Fe 5E15 and Fe 1E16 ) and this may be due to the recrystallization of some grains.…”

Section: X-ray Diffractionsupporting

confidence: 83%

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Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures

et al. 2023

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The present report examines the tunability of optical band gap by 150 keV Fe ion implantation in cerium oxide (CeO2) thin films and their electronic structures. X-ray diffraction (XRD) confirms the stable FCC structure and these films lose their crystalline nature with increasing ion fluences. Atomic force microscopy (AFM) shows the morphology changes. Raman measurement exhibits the presence of defect states. UV-Vis spectroscopy reveals that the optical band gap reduces from 3.14 eV to 2.70 eV. These results are well correlated with the electronic structure studies from the X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The XPS indicates the existence of Ce3+ due to the replacement of Fe3+ which reduces the Ce4+ to Ce3+ ions. XAS at the Ce-M4,5 edge reveals the change in Ce4+→Ce3+ with Fe ion fluence and the O-K edge spectra show that the vacancies are introduced after Fe ion implantation. The edge shifting of the O-K edge confirmed the presence of Ce4+-VO-Ce3+ and Ce3+-VO-Fe3+ networks in Fe-implanted thin films. This reversible ability enables the CeO2-based nanomaterial for energy and environmental-related applications.

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Section: X-ray Diffractionsupporting

confidence: 83%

“…The enhancement in optical and ferromagnetic properties of N and C ion implanted ceria was earlier reported by Pawan et al [19,20]. Besides that, an investigation on Co ion-implanted ceria thin films was also reported with an emphasis on the electronic structures [21].…”

Section: Introductionmentioning

confidence: 59%

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures

et al. 2023

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“…According to the roughness values presented in Table I, it was observed that the CeO 2 thin films exhibited greater roughness than that of TiO 2 , as well as when CeO 2 was in the upper layer. It is expected that the films formed by smaller grains have lower surface roughness [24].…”

Section: Resultsmentioning

confidence: 99%

Effect of temperature on the photocatalytic properties of TiO2-CeO2 multilayer thin films obtained by spin coating method

et al. 2020

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TiO2-CeO2 multilayer thin films were deposited by the spin coating method and calcined at 500 and 700 °C. Thin films were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), and diffuse reflectance spectroscopy. Photocatalytic properties were estimated by varying the concentration of the methylene blue dye (MB) when illuminated by UV radiation. The XRD patterns showed that the temperatures of 500 and 700 °C were effective to obtain TiO2 and CeO2 phases. The difference in the homogeneity of TiO2 and CeO2 films was evident in the AFM images, where the films showed an average roughness of 2.0 and 5.3 nm, respectively. The CeO2-TiO2 thin film obtained at 700 °C showed the best photocatalytic activity, reducing the concentration of MB by approximately 80%, while the CeO2 and TiO2 films obtained at 700 °C reduced only 20% and 29%, respectively. The reuse test showed that the thin films maintained their photocatalytic activity after 4 cycles, and there was no need for thermal treatment, indicating that it is an immobilized photocatalyst with high efficiency in the degradation of organic dyes.

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“…2, the displacements of the peaks were observed with doping, indicating the introduction of Eu 3+ , Tb 3+ and Tm 3+ ions into CeO 2 lattice. Doping with materials of different valences and ionic radius tend to cause changes in the crystalline lattice that may go unnoticed when analyzed only visually, especially when doping occurs in low concentrations [20]. Table I presents the crystallite sizes obtained by the Scherrer equation; according to the values obtained, the doping with Eu 3+ and Tb 3+ promoted an increase in the size of the crystallite, whereas the doping with Tm 3+ provided a small reduction.…”

Section: Methodsmentioning

confidence: 99%

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

Dias

2019

Cerâmica

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In this study, thin films of Eu3+, Tb3+ and Tm3+ doped CeO2 in the proportions of 2 and 4 mol% were obtained by spin coating and calcined at 700 °C. The films were characterized by XRD, SEM, AFM and UV-vis techniques. The photocatalytic activity of the thin films was measured by the degradation of the methylene blue (MB) dye. The thin films were submitted to 4 photocatalytic cycles to analyze the capacity to be reused. XRD patterns showed no secondary phase formation, where all characteristic peaks were related to CeO2. SEM micrographs indicated that doping at 4 mol% promoted the reduction in the thickness and surface porosity of the thin films. AFM images indicated the increase in surface roughness with rare earths doping. Doping with Eu3+, Tb3+ and Tm3+ increased the degradation of the methylene blue dye by at least 15% for thin films doped at 4 mol%. The reuse tests indicated that the photocatalytic activity remained practically constant even with the application of four consecutive cycles.

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Magnetic and electronic structures of Co ion implanted CeO2 thin films

Cited by 27 publications

References 47 publications

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures

Effect of temperature on the photocatalytic properties of TiO2-CeO2 multilayer thin films obtained by spin coating method

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

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Magnetic and electronic structures of Co ion implanted CeO2 thin films

Cited by 27 publications

References 47 publications

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO2 and their electronic structures

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO2 and their electronic structures

Effect of temperature on the photocatalytic properties of TiO2-CeO2 multilayer thin films obtained by spin coating method

Study of obtaining thin films of CeO2 doped with 2 and 4 mol% of europium, terbium and thulium by spin coating: photocatalytic properties

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Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures

Tunability of bandgap from UV to visible region by transition metal ion implantation in CeO₂ and their electronic structures