Artículo
Influence of Synthesis Time on the Morphology and Properties of CeO2Nanoparticles: An Experimental-Theoretical Study
De Oliveira, Regiane Cristina; Amoresi, Rafael Aparecido Ciola; Marana, Naiara Letícia; Zaghete, Maria Aparecida; Ponce, Miguel Adolfo
; Chiquito, Adenilson José; Sambrano, Julio Ricardo; Longo, Elson; Simões, Alexandre Zirpoli
Fecha de publicación:
08/2020
Editorial:
American Chemical Society
Revista:
Crystal Growth & Design
ISSN:
1528-7483
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Here we combined experimental and theoretical results to correlate the morphological, optical, and electronic properties of cerium oxide (CeO2) prepared by a microwave-assisted hydrothermal method with varying synthesis times. X-ray diffraction confirmed a cubic structure without deleterious phases. Density functional theory simulations confirmed an indirect (K-L) bandgap energy of 2.80 eV, with an electron transition between O-2p and Ce-4f orbitals, which agrees with the value obtained using diffuse reflectance. Raman spectroscopy shows that changing the synthesis times results in samples with different defect densities at a short range. Theoretical calculations confirmed that the deformations and changes in the experimental Raman spectra area result in oxygen displacement; as the displacement decreases, the crystallinity increases, and only one peak was observed. Scanning electron microscopy and high-resolution transmission electron microscopy show changes in the morphologies as the synthesis time varies. For shorter times, sheet and polyhedral morphologies were noted. With time increases, the sheets turn into nanorods and nanowires until the nanowires decrease and cubes are observed. In addition, an initial study regarding the influence of the surface on the electric response of CeO2 was completed. It was observed that the presence of different surface defects ([CeO62Vox] or [CeO7Vox]) can alter the material resistance.
Palabras clave:
CeO2
,
Cristal
,
Morphology
,
Semiconductors
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
De Oliveira, Regiane Cristina; Amoresi, Rafael Aparecido Ciola; Marana, Naiara Letícia; Zaghete, Maria Aparecida; Ponce, Miguel Adolfo; et al.; Influence of Synthesis Time on the Morphology and Properties of CeO2Nanoparticles: An Experimental-Theoretical Study; American Chemical Society; Crystal Growth & Design; 20; 8; 8-2020; 5031-5042
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