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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Rocha, Leandro S. R. [1] ; Amoresi, Rafael A. C. [2] ; Moreno, Henrique [2] ; Ramirez, Miguel A. [2] ; Ponce, Miguel A. [3] ; Foschini, Cesar R. [4] ; Longo, Elson [1] ; Simoes, Alexandre Z. [2]
Total Authors: 8
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ, Sch Engn, UNESP, BR-12516410 Guaratingueta, SP - Brazil
[3] Inst Mat Sci & Technol Invest INTEMA, RA-7600 Mar Del Plata - Argentina
[4] Sao Paulo State Univ, Sch Engn, UNESP, BR-17033360 Bauru, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ACS OMEGA; v. 5, n. 25, p. 14879-14889, JUN 30 2020.
Web of Science Citations: 0
Abstract

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 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 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. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/19143-7 - An experimental theoretical approach of conduction mechanisms and interface defects of heterostructure sensors based on P-N and N-N semiconductors from CeO2 matrices
Grantee:Rafael Aparecido Ciola Amoresi
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 18/20590-0 - Novel renewable rare-earth based hybrid nanomaterials for environmental sensing and energy-related applications
Grantee:Leandro Silva Rosa Rocha
Support Opportunities: Scholarships in Brazil - Post-Doctoral