Physicochemical characterization and antioxidant properties of cerium oxide nanoparticles

Вазиров, Р. А.; Sokovnin, S. Yu.; Il’ves, Vladislav G.; Бажукова, И. Н.; Pizúrová, N.; Kuznetsov, M. V.

doi:10.1088/1742-6596/1115/3/032094

Cited by 25 publications

(14 citation statements)

References 10 publications

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“…BCW and CCWO XPS Ce 3d orbitals above 880 eV could be crudely deconvoluted into two sets (3d 5/2 and d 3/2 ) of five (v and u) peaks conjoined strictly together in Figure a. The spectrum of pure CeO 2 (only Ce 4+ ions) originally consists of three multiplets related to interactions with 4f n ( n = 0, 1, and 2) electrons denoted as v, v″, with v‴ (in the d 5/2 component); and u, u″ with u‴ (d 3/2 component) separated by 18.5 eV gap with the typical intensity relation v/u = 1.5 as shown by Romeo et al − We can also see peaks assigned to Ce 2 O 3 (intentionally Ce 3+ ions) which should exhibit two multiplets related to 4f n ( n = 1,2) denoted to v o , v′ as d 5/2 components and u o , u′, respectively, as d 3/2 bands. Peaks denoted as v o and v′ are located in these exact reference positions and can serve as an evidence for self-occurring charge transfer phenomena present inside our compounds during HT synthesis. − They represent about 24% of ceria in BCW and, analogically around 41% regarding CCWO.…”

Section: Resultsmentioning

confidence: 99%

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

et al. 2022

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This comprehensive work showcases two novel, rock-salt-type minerals in the form of amphoteric cerium–tungstate double perovskite and ilmenite powders created via a high-temperature solid-state reaction in inert gases. The presented studies have fundamental meaning and will mainly focus on a detailed synthesis description of undoped structures, researching their possible polymorphism in various conditions and hinting at some nontrivial physicochemical properties like charge transfer for upcoming optical studies after eventual doping with selectively chosen rare-earth ions. The formerly mentioned, targeted A 2 BB′X 6 group of compounds contains mainly divalent alkali cations in the form of XII A = Ba 2+ , Ca 2+ sharing, here, oxygen-arranged clusters ( II X = O 2– ) with purposely selected central ions from f-block VI B = Ce 4/3+ and d-block VI B′ = W 4/5/6+ since together they often possess some exotic properties that could be tuned and implemented into futuristic equipment like sensors or energy converters. Techniques like powder XRD, XPS, XAS, EPR, Raman, and FTIR spectroscopies alongside DSC and TG were involved with an intent to thoroughly describe any possible changes within these materials. Mainly, to have a full prospect of any desirable or undesirable phenomena before diving into more complicated subjects like: energy or charge transfer in low temperatures; to reveal whether or not the huge angular tilting generates large enough dislocations within the material’s unit cell to change its initial properties; or if temperature and pressure stimuli are responsible for any phase transitions and eventual, irreversible decomposition.

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Section: Resultsmentioning

confidence: 99%

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

et al. 2022

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“…The binding energy peaks at 906 eV, 901.54 eV (Ce 4+ 3d 5/2 ) and peaks at 896.49 eV, 890.14 eV (Ce 4+ 3d 3/2 ) is assigned to Ce 3d. Four photoelectron signal peaks at 898.4 eV, 904.2 eV and 884.4 eV, 887.5 eV is assigned to Ce 3+ 3d 5/2 and Ce 3+ 3d 3/2 [13,19,20]. Figure 6.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoluminescence Properties of BaAl2O4: Ce3+/Li+ Yellow Phosphors

K¹,

Bhargav²,

Aravinth³

et al. 2021

Preprint

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Ce3+/ Li+ activated barium aluminate phosphor (BAO) was synthesized by conventional solid-state reaction method. The crystal structure of the synthesized phosphor was analyzed by X-ray diffraction (XRD) and Raman spectroscopy analysis. FT-IR spectrum results revealed the characteristic vibration bands present in the synthesized phosphor. Surface composition analysis of the prepared samples was examined using X-ray photoelectron spectroscopy (XPS). PL emission band observed at 589 nm was assigned to 5D excited level corresponding to 2F5/2 transition in yellow region under the excitation wavelength of 320 nm. Yellow light emission was confirmed by the Commission Internationale de L’Eclairage (CIE) chromatic coordinate graph. The color purity of BAO: 0.5Ce3+, BAO: 0.5Ce3+, 0.1Li+ was found to be 78.4 %, 81.3 % whereas the measured lifetime was 4.333, 4.738 ns respectively.

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“…This may be due to the fact the maltodextrin shell obstructs the natural CeO2 oxidation processes and thus preserves the Ce 3+ and Ce 4+ ions presence on the particle surface. CeO2 nanoparticles obtained by the gasphase method have a rather high different valence cerium ions ratio [17]. However, strongly nonequilibrium evaporation conditions by an electron beam lead to a significant structural defects number, including on the nanoparticle surface [11].…”

Section: Resultsmentioning

confidence: 99%

Catalytic Activity of Cerium Oxide Nanoparticles

Бажукова¹,

Zvonareva

Myshkina³

et al. 2020

NANOCON Conference Proeedings

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Cerium oxide (CeO2) nanoparticles present an interesting material for various applications in biotechnology and medicine. The mechanism of CeO2 nanoparticles biological activity is supposed to be related to the presence both Ce 3+ and Ce 4+ ions on the surface of the nanocrystal. We studied and compared the catalytic activity of CeO2 nanoparticles synthesized by chemical and physical methods. The cerium oxide was found to demonstrate catalase-like and peroxidase activity. CeO2 nanoparticles obtained by a chemical method showed more pronounced catalytic properties. In addition, this material catalyzed the decomposition of hydrogen peroxide by the enzyme horseradish peroxidase.

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Physicochemical characterization and antioxidant properties of cerium oxide nanoparticles

Cited by 25 publications

References 10 publications

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

Enhanced Photoluminescence Properties of BaAl2O4: Ce3+/Li+ Yellow Phosphors

Catalytic Activity of Cerium Oxide Nanoparticles

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Physicochemical characterization and antioxidant properties of cerium oxide nanoparticles

Cited by 25 publications

References 10 publications

Synthesis Attempt and Structural Studies of Novel A2CeWO6 Double Perovskites (A2+ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A2CeWO6 Double Perovskites (A2+ = Ba, Ca) in and outside of Ambient Conditions

Enhanced Photoluminescence Properties of BaAl2O4: Ce3+/Li+ Yellow Phosphors

Catalytic Activity of Cerium Oxide Nanoparticles

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Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions

Synthesis Attempt and Structural Studies of Novel A₂CeWO₆ Double Perovskites (A²⁺ = Ba, Ca) in and outside of Ambient Conditions