Effect of oxygen vacancy on structural, optical, and photocatalytic properties of ceria films grown by magnetron sputtering deposition

Wang, Yanlong; Zhang, Xianghua; Li, Yimin; Lv, Qiujian; Deng, Songwen; Li, Gang; Jin, Yuqi

doi:10.1016/j.surfcoat.2018.11.017

Cited by 12 publications

(4 citation statements)

References 38 publications

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“…X-ray photoelectron spectroscopy (XPS) characterization was performed by using a Thermo Scientific ESCALAB 250Xi spectrometer. 24 Fresh fractures of samples were used for XPS analysis to exclude any contamination. Take-off angle was set as ~90° to penetrate deeply into bulk.…”

Section: Methodsmentioning

confidence: 99%

“…X‐ray diffraction (XRD) analysis was carried out with an Empyrean‐100 Panalytical diffractometer using monochromatic Cu Kα irradiation (1.5418 Å). X‐ray photoelectron spectroscopy (XPS) characterization was performed by using a Thermo Scientific ESCALAB 250Xi spectrometer 24 . Fresh fractures of samples were used for XPS analysis to exclude any contamination.…”

Section: Methodsmentioning

confidence: 99%

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Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

et al. 2020

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Incorporation of transition-metal ions (TMIs) in the precipitated nanocrystals (NCs) of glass-ceramics (GCs) greatly improves the photonic properties of these materials. The crystal field and coordination of TMIs show fingerprints for spectroscopic characterization. However, it is difficult to probe the effect of the host NCs' structural phase on doped TMIs' d-d orbitals. Herein, ZnF 2 :Ni and KZnF 3 :Ni based on controllable crystallization in KF-ZnF 2-SiO 2 :Ni 2+ GCs were taken as model systems. Compared to ZnF 2 , perovskite-type KZnF 3 has higher binding energy Zn-F bonds in which Ni 2+ are easier to be segregated, which makes KZnF 3 :Ni be better "excited electron trapper" due to hole localization to intra-gap Ni states. These findings contribute to the understanding and design of TMIs-doped GCs in practical applications. K E Y W O R D S band structure, binding energy, oxyfluorides, perovskite, photoluminescence 1 | INTRODUCTION Tremendous attention has been paid to optical oxyfluoride glass ceramics (GCs) because of their unique comprehensive characteristics of low phonon energy of fluoride crystals, but also favorable mechanical properties and durability of oxide glasses. In particular, through the precipitation of rare earth ions (REIs) and transition metal ions (TMIs)-doped fluoride

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

et al. 2020

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“…In addition, it is well known that oxygen vacancies doping is one of the important defects which is inevitable during the growth of oxide films. Its existence will significantly affect the valence state of metal ions and crystal structure of materials, thus changing various physical properties [16][17][18][19][20]. For example, if there are excessive oxygen vacancies in the lattice of YIG film, part of Fe 3+ in the material will be reduced to Fe 2+ , which will significantly affect the optical, magnetic and electrical properties [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Its existence will significantly affect the valence state of metal ions and crystal structure of materials, thus changing various physical properties [16][17][18][19][20]. For example, if there are excessive oxygen vacancies in the lattice of YIG film, part of Fe 3+ in the material will be reduced to Fe 2+ , which will significantly affect the optical, magnetic and electrical properties [20,21]. However, the effect of oxygen vacancies doping on the electrical properties of YIG has not been thoroughly studied, and the dynamic processes of oxygen vacancies formation and recombination at different temperatures have not been reported, which is not conducive to the in-depth understanding of the electrical properties of YIG materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of oxygen vacancies on the electrical transport properties of conductive Y₃Fe₅O₁₂ films at high temperature

Chen

Luo

Cao

et al. 2023

J. Phys. D: Appl. Phys.

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Oxygen vacancies doping in oxide materials is a very common means to modulate the electrical transport properties. In this work, Y3Fe5O12 (YIG) films with abundant oxygen vacancies were grown on Gd3Ga5O12 (GGG) substrates by solution spin coating and high vacuum annealing method, and the effect of oxygen vacancies on the electrical transport properties was systematically studied. It was found that a large amount of oxygen vacancies doping could convert the YIG film from a good room-temperature insulator to an electrical conductor. At high temperature and high vacuum, a large number of oxygen vacancies increased the disorder of the system, resulting in the appearance of a band-tail state, thus forming a constant range hopping conduction. While when the sample was exposed to air, the oxygen vacancies in the sample would gradually recombine and disappear, and the conduction mechanism transferred to drift mode.

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Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

Sánchez

Rosas

García

et al. 2020

Physica Status Solidi (a)

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Herein, the influence of the flow rate, substrate temperature, and thermal annealing at 700 C on the optical and structural parameters of nanostructured ceria thin films prepared by ultrasonic spray pyrolysis is evaluated. The morphology, structure, and optical properties are studied by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL). The spray conditions are optimized for obtaining smooth, dense, and homogeneous nanocrystalline films with grain sizes smaller than 20 nm. XPS demonstrates a high percentage (%40%) of Ce 3þ in the films, even in heat-treated films (%25%). The Ce 3þ concentration does not depend on the growth temperature. Intense peaks at 575 and 618 nm are observed in PL measurements. These peaks are not reported in pure ceria thin films, they are dependent on the growth parameters (director and carrier gas flow rates and substrate temperature), and they are associated with levels produced by oxygen defects in the films. Variations in the flow rate modify the optimal temperature and the kinetic reaction, which also modifies the preferential orientation and the defect distribution in the films.

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Effect of oxygen vacancy on structural, optical, and photocatalytic properties of ceria films grown by magnetron sputtering deposition

Cited by 12 publications

References 38 publications

Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

Effect of oxygen vacancies on the electrical transport properties of conductive Y₃Fe₅O₁₂ films at high temperature

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis

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Effect of oxygen vacancy on structural, optical, and photocatalytic properties of ceria films grown by magnetron sputtering deposition

Cited by 12 publications

References 38 publications

Structural phase evolved Ni2+‐doped fluoride nanocrystals in KF−ZnF2−SiO2 glass‐ceramics

Structural phase evolved Ni2+‐doped fluoride nanocrystals in KF−ZnF2−SiO2 glass‐ceramics

Effect of oxygen vacancies on the electrical transport properties of conductive Y3Fe5O12 films at high temperature

Visible Emission on Nanostructured CeO2 Thin Films Obtained by Spray Pyrolysis

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Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

Structural phase evolved Ni²⁺‐doped fluoride nanocrystals in KF−ZnF₂−SiO₂ glass‐ceramics

Effect of oxygen vacancies on the electrical transport properties of conductive Y₃Fe₅O₁₂ films at high temperature

Visible Emission on Nanostructured CeO₂ Thin Films Obtained by Spray Pyrolysis