Luminescence and optical properties of cerium oxide nanoparticles

Бажукова, И. Н.; Sokovnin, S. Yu.; Il’ves, Vladislav G.; Myshkina, A. V.; Вазиров, Р. А.; Pizúrová, Naděžda; Kasyanova, V. V.

doi:10.1016/j.optmat.2019.04.021

Cited by 47 publications

(25 citation statements)

References 17 publications

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“…For reference CeO 2 NTs, one broad emission peak at around 3.0 eV and an intensive emission with maximum peak at 2.0 eV are observed the spectrum at room temperature (Figure a). According to the optical research findings on the CeO 2 defects, these two signals demonstrate clearly the presence of Ce 3+ (V O s) and the charge transfer Ce 4+ −O 2− (CT), namely, PL emission in the region of 3.0 eV was due to radiative transitions in the Ce 3+ ion involving the emission of F 0 centers related to the formation of V O s, and the intensive band in the region of 2.0 eV was associated to electronic transitions with Ce 4+ −O 2− charge transfer. However, PL of the exemplary 0.5TCPP@CeO 2 NTs changed dramatically as shown in Figure b, where only one intensive emission with maximum peak at around 2.4 eV was observed.…”

Section: Resultsmentioning

confidence: 90%

“…Taken 0.5TCPP@CeO 2 as an example, the BG narrowed to approximately 2.75 eV, which is in line with the more extended absorption in visible region, and serves for making use of lower‐energy photons. The BG reduction may be acquired from either the generation of oxygen vacancies or the induction of an indirect BG …”

Section: Resultsmentioning

confidence: 99%

“…The BG reduction may be acquired from either the generation of oxygen vacancies or the induction of an indirect BG. [23] The normalized fluorescent spectra were obtained under the excitation of 420 nm light. As shown in Figure 4c, both TCPP and 0.5TCPP@CeO 2 NTs show emission peaks at 650 nm originated from TCPP, proving that TCPP had been successfully immobilized in CeO 2 NTs.…”

Section: Electronic Communication Between Tcpp and Ceomentioning

confidence: 99%

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Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Meng

Chen

et al. 2019

ChemPlusChem

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Artificial enzymes have broad applications in catalysis and can be used to help understand catalytic mechanisms. Nanoceria has various enzyme‐mimetic properties that depend on the relative content of Ce3+ and Ce4+. In this context, CeO2 nanotubes was investigated as catalase mimics for water oxidation. The photosensitizer 5,10,15,20‐meso‐tetra(4‐carboxyphenyl) porphyrin (TCPP) was facilely embedded in CeO2 nanotubes (TCPP@CeO2 NTs), and photoinduced charge transfer was shown to occur between the strongly coupled TCPP and CeO2, which leads to effective charge separation and charge redistribution within the hybrids. As a consequence, formation of H2O2, a competing process in water oxidation and a key factor that affects the oxidative stability of photoelectrodes, was effectively inhibited on TCPP@CeO2 NTs. These findings show that enzyme mimics can be used for the selective generation of reactive oxygen species, and therefore to control the kinetics of water oxidation.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Electronic Communication Between Tcpp and Ceomentioning

confidence: 99%

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Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Meng

Chen

et al. 2019

ChemPlusChem

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“…Для нанокристаллов характерны разупорядочение структуры и образование поверхностных дефектов. Таким образом, в кристаллической решетке наночастиц возникает множество ионов РЗИ с различным локальным окружением [2,30,[45][46][47][48]. В результате ионы, имеющие разное координационное окружение, будут проявлять различную фотолюминесценцию.…”

Section: симметрия локального окружения рзи в нанокристаллахunclassified

“…В наших работах исследован антиоксидантный потенциал данных наночастиц [223][224][225]. Кроме того, были показаны низкая цитотоксичность СеО 2 и избирательное ингибирование опухолевых клеток наночастицами [47], что представляет значительный интерес для биомедицинских приложений. Допирование СеО 2 РЗИ приводит к усилению биологической активности наночастиц и может быть использовано для реализации мультимодальной визуализации [226].…”

Section: тераностика в последние годы значитель-unclassified

Люминесцентные Наноматериалы, Допированные Редкоземельными Ионами, И Перспективы Их Биомедицинского Применения (Обзор)

Бажукова¹,

Пустоваров²,

Мышкина³

et al. 2020

Журнал Технической Физики

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Luminescent nanomaterials doped with rare-earth elements are characterized by such physicochemical properties as long-lived luminescence, large Stokes or anti-Stokes shifts, narrow emission bands, high photostability and low toxicity. These materials can be considered as a new generation of biosensors along with conventional molecular probes, such as organic dyes, quantum dots and chelate-based lanthanide probes. In recent years there has been significant interest in the study of functional nanomaterials based on rare earth elements. The purpose of this paper is to provide an overview of recent advances in the development of luminescent inorganic nanoparticles doped with rare earth elements which could be used for biomedical applications.

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Investigating the Dynamics of Pt/CeO₂ Catalysts at the Powder Agglomerate Scale by Combining In Situ Hyperspectral Raman Imaging and SEM‐EDX Analysis

2023

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The dynamics of Pt/CeO2 catalysts is a hot topic since its knowledge can be used to (re)generate more active sites for redox reactions, even at low temperature (<500 °C). While numerous works focus on the atomic scale, the spatial extent of Pt surface diffusion is poorly known. In this work, it is evaluated at the powder agglomerate scale using an original methodology combining SEM‐EDX analysis and in situ optical/microRaman hyperspectral imaging performed on a Pt/CeO2+CeO2 mechanical mixture. No intergranular diffusion of platinum during redox cycles at 500 °C is revealed by these techniques, in particular by the Raman images of Ce3+ and peroxo species, which are highly sensitive to the presence of Pt atoms. It strongly suggests that Pt surface diffusion takes place only at the nanometer scale and could be limited by atom trapping on Pt/CeO2 agglomerates. Our method for investigating diffusion processes at the micrometer scale may be extended to other thermochemical conditions and other materials.

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Luminescence and optical properties of cerium oxide nanoparticles

Cited by 47 publications

References 17 publications

Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Люминесцентные Наноматериалы, Допированные Редкоземельными Ионами, И Перспективы Их Биомедицинского Применения (Обзор)

Investigating the Dynamics of Pt/CeO₂ Catalysts at the Powder Agglomerate Scale by Combining In Situ Hyperspectral Raman Imaging and SEM‐EDX Analysis

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Luminescence and optical properties of cerium oxide nanoparticles

Cited by 47 publications

References 17 publications

Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Enzyme‐Like Catalytic Activity of Porphyrin‐Functionalized Ceria Nanotubes for Water Oxidation

Люминесцентные Наноматериалы, Допированные Редкоземельными Ионами, И Перспективы Их Биомедицинского Применения (Обзор)

Investigating the Dynamics of Pt/CeO2 Catalysts at the Powder Agglomerate Scale by Combining In Situ Hyperspectral Raman Imaging and SEM‐EDX Analysis

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Product

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Investigating the Dynamics of Pt/CeO₂ Catalysts at the Powder Agglomerate Scale by Combining In Situ Hyperspectral Raman Imaging and SEM‐EDX Analysis