Novel Approaches of Nanoceria with Magnetic, Photoluminescent, and Gas-Sensing Properties.

Autor: Rocha LSR; Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos, São Paulo 13565-905, Brazil., Amoresi RAC; School of Engineering, Sao Paulo State University (UNESP), Guaratinguetá, São Paulo 12516-410, Brazil., Moreno H; School of Engineering, Sao Paulo State University (UNESP), Guaratinguetá, São Paulo 12516-410, Brazil., Ramirez MA; School of Engineering, Sao Paulo State University (UNESP), Guaratinguetá, São Paulo 12516-410, Brazil., Ponce MA; Institute of Materials Science and Technology Investigation (INTEMA), Mar del Plata 7600, Argentina., Foschini CR; School of Engineering, Sao Paulo State University (UNESP), Bauru, São Paulo 17033-360, Brazil., Longo E; Department of Chemistry, Federal University of São Carlos (UFSCar), São Carlos, São Paulo 13565-905, Brazil., Simões AZ; School of Engineering, Sao Paulo State University (UNESP), Guaratinguetá, São Paulo 12516-410, Brazil.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2020 Jun 15; Vol. 5 (25), pp. 14879-14889. Date of Electronic Publication: 2020 Jun 15 (Print Publication: 2020).
DOI: 10.1021/acsomega.9b04250
Abstrakt: The modification of CeO 2 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 gas-sensing 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 room-temperature 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.
Competing Interests: The authors declare no competing financial interest.
(Copyright © 2020 American Chemical Society.)
Databáze: MEDLINE
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