Electric Properties Change during Morphological Evolution of CeO<sub>2</sub> Nanostructures: Synergy between Bulk and Surface Defects
CeO<sub>2</sub> 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.
Authors
- C. Macchi (ORCID: https://orcid.org/0000-0002-5927-866X)
- E. Longo (ORCID: https://orcid.org/0000-0001-8062-7791)
- A. Somoza (ORCID: https://orcid.org/0000-0002-0025-1999)
- Luis I. Granone (ORCID: https://orcid.org/0000-0002-8733-2942)
- C. M. Aldao (ORCID: https://orcid.org/0000-0001-9827-9086)
- Hugo Marlon da Silva Nascimento (ORCID: https://orcid.org/0000-0003-1466-3676)
- M.A. Ponce (ORCID: https://orcid.org/0000-0002-0262-7718)
- L.S.R. Rocha (ORCID: https://orcid.org/0000-0002-6059-2197)
- P.P. Ortega (ORCID: https://orcid.org/0000-0002-4254-1281)
- F. Moura (ORCID: https://orcid.org/0000-0002-1205-6672)
- Alley Michael da Silva Procópio (ORCID: https://orcid.org/0000-0001-8700-8782)
- Fernando D. Ivorra
- M.S. Castro (ORCID: https://orcid.org/0000-0002-6783-7695)
Institutions
- Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
- Universidade Federal de São Carlos (BR)
- National University of Mar del Plata (AR)
- Universidad Nacional del Centro de la Provincia de Buenos Aires (AR)
- Instituto de Investigaciones Físicas de Mar del Plata (AR)
- Instituto de Investigaciones en Ciencia y Tecnología de Materiales (AR)
- Universidade Federal de Itajubá (BR)
Publication Details
- Journal
- ACS Omega
- Published
- 2024-10-03
- DOI
- https://doi.org/10.1021/acsomega.4c03210
- Citations
- 11
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 1.29
Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Consejo Nacional de Investigaciones Científicas y Técnicas
- Fundação de Amparo à Pesquisa do Estado de Minas Gerais
- Universidade Federal de Itajubá
- Universidad Nacional del Centro de la Provincia de Buenos Aires
- Universidad Nacional de Mar del Plata
- Centro de Desenvolvimento de Materiais Funcionais
- Agencia Nacional de Promoción Científica y Tecnológica