| Full text | |
| Author(s): Show less - |
Macchi, Carlos
;
Procopio, Alley M. S.
;
Rocha, Leandro S. R.
;
Ortega, Pedro P.
;
Aldao, Celso M.
;
Granone, Luis I.
;
Nascimento, Hugo M. S.
;
Longo, Elson
;
Castro, Miriam S.
;
Ivorra, Fernando D.
;
Somoza, Alberto
;
Moura, Francisco
;
Ponce, Miguel A.
Total Authors: 13
|
| Document type: | Journal article |
| Source: | ACS OMEGA; v. 9, n. 41, p. 11-pg., 2024-10-03. |
| Abstract | |
CeO2 samples were synthesized via the polymeric precursor method at different calcination temperatures. Electric properties were investigated using positron annihilation lifetime spectroscopy, electron paramagnetic resonance spectroscopy, and complex impedance spectroscopy. Reduction in the specific surface area of the particles with increasing calcination temperature along with morphological changes were observed. PALS depicted doubly ionized oxygen vacancies surrounded by two Ce3+ atoms, while the EPR spectroscopy showed a singly ionized oxygen vacancy surrounded by Ce3+ and Ce4+ ions. Impedance measurements unraveled the presence of polarons, while thermal treatments led to a lower electrical conductance, as the calcination temperature increased. (AU) | |
| 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 |
| 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: | 20/02352-5 - In-depth spectroscopic investigations of hybrid cerium oxide quantum-dots towards mitigation of the COVID-19 pandemic |
| Grantee: | Leandro Silva Rosa Rocha |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |