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

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]

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

• 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 type: Research Projects - Thematic Grants
• FAPESP's process: 17/19143-7 - An experimental theoretical approach of conduction mechanisms and interface defects of heterostructures sensors based on p-n and n-n semiconductors from CeO2 matrices
• Grantee: Rafael Aparecido Ciola Amoresi
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support type: 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 type: Scholarships in Brazil - Post-Doctorate