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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 5, n. 25, p. 14879-14889, JUN 30 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/19143-7 - Uma abordagem teórico-experimental dos mecanismos de condução e defeitos de interface em heteroestruturas sensoras baseados em semicondutores P-N e N-N a partir de matrizes de CeO2
• Beneficiário: Rafael Aparecido Ciola Amoresi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 18/20590-0 - Novos nanomateriais híbridos à base de elementos terras-rara renováveis para aplicações multifuncionais energéticas e de sensoriamento ambiental
• Beneficiário: Leandro Silva Rosa Rocha
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado