The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals
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Otros documentos de la autoría: Piccoli Moreno, Henrique; Domingues, G.L.; Assis, Marcelo de; Ortega, Pedro; Mastelaro, Valmor Roberto; Arjona Ramírez, Miguel; Simões, Alexandre
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Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Título
The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 NanocrystalsAutoría
Fecha de publicación
2023-03-02Editor
American Chemical SocietyCita bibliográfica
Moreno, H., et al. "The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals." Inorganic Chemistry 62.10 (2023): 4291-4303.Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/submittedVersionPalabras clave / Materias
Resumen
In this work, we focus on understanding the morphology and photocatalytic properties of CeO2 nanocrystals (NCs) synthesized via a microwave-assisted solvothermal method using acetone and ethanol as solvents. Wulff ... [+]
In this work, we focus on understanding the morphology and photocatalytic properties of CeO2 nanocrystals (NCs) synthesized via a microwave-assisted solvothermal method using acetone and ethanol as solvents. Wulff constructions reveal a complete map of available morphologies and a theoretical-experimental match with octahedral nanoparticles obtained through synthesis using ethanol as solvent. NCs synthesized in acetone show a greater contribution of emission peaks in the blue region (∼450 nm), which may be associated with higher Ce3+ concentration, originating shallow-level defects within the CeO2 lattice while for the samples synthesized in ethanol a strong orange-red emission (∼595 nm) suggests that oxygen vacancies may originate from deep-level defects within the optical bandgap region. The superior photocatalytic response of CeO2 synthesized in acetone compared to that of CeO2 synthesized in ethanol may be associated with an increase in long-/short-range disorder within the CeO2 structure, causing the Egap value to decrease, facilitating light absorption. Furthermore, surface (100) stabilization in samples synthesized in ethanol may be related to low photocatalytic activity. Photocatalytic degradation was facilitated by the generation of ·OH and ·O2– radicals as corroborated by the trapping experiment. The mechanism of enhanced photocatalytic activity has been proposed suggesting that samples synthesized in acetone tend to have lower e′─h· pair recombination, which is reflected in their higher photocatalytic response. [-]
Entidad financiadora
Fundaçao de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | European Union-Next Generation EU
Código del proyecto o subvención
2013/07296-2 | 2018/18236-4 | MGS/2021/21 (UP2021-021)
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Copyright © 2023 American Chemical Society
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