Author(s): Rocha, Leandro Silva Rosa [UNESP] ; Amoresi, Rafael Aparecido Ciola [UNESP] ; Moreno, Henrique Piccoli [UNESP] ; Ramirez Gil, Miguel Angel [UNESP] ; Ponce, Miguel Adolfo ; Foschini, Cesar Renato [UNESP] ; Longo, Elson [UNESP] ; Simões, Alexandre Zirpoli [UNESP]
Date: 2021
Persistent ID: http://hdl.handle.net/11449/213659
Origin: Oasisbr
Subject(s): Nanopartículas; Nanoceria; Photoluminescent; Luminescência; Gas-Sensing Properties
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Outra
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
The modification of CeO2 with rare-earth elements opens up a wide range of applications as biomedical devices using infrared emission as well as magnetic and gas-sensing devices, once the structural, morphological, photoluminescent, magnetic, electric, and gassensing properties of these systems are strongly correlated to quantum electronic transitions between rare-earth f-states among defective species. Quantitative phase analysis revealed that the nanopowders are free from secondary phases and crystallize in the fluorite-type cubic structure. Magnetic coercive field measurements on the powders indicate that the substitution of cerium with lanthanum (8 wt %), in a fluorite-type cubic structure, created oxygen vacancies and led to a decrease in the fraction of Ce species in the 3+ state, resulting in a stronger roomtemperature ferromagnetic response along with high coercivity (160 Oe). In addition to the magnetic and photoluminescent behavior, a fast response time (5.5 s) was observed after CO exposure, indicating that the defective structure of ceria-based materials corresponds to the key of success in terms of applications using photoluminescent, magnetic, or electrical behaviors.
Faculty of Engineering of Guaratingueta, São Paulo State University, UNESP
INTEMA - National University of Mar del Plata, Mar del Plata, Argentina
FAPESP: 2013/07296-2. 2017/19143-7. 2018/ 20590-0
CNPq: 573636/2008-7
INCTMN 2008/57872-1
