High-performance CeO2:Co nanostructures for the elimination of accidental poisoning caused by CO intoxication
J.C.L. Carvalho,
L.S.R. Rocha,
R.A. Renzetti,
A.M.S. Procopio,
V.R. Mastelaro,
A.Z. Simões,
M.A. Ponce,
C. Macchi,
A. Somoza,
C.M. Aldao,
E. Longo,
F. Moura
Affiliations
J.C.L. Carvalho
Advanced Materials Interdisciplinary Laboratory, Federal University of Itajubá, (UNIFEI), Campus Itabira, MG, Brazil
L.S.R. Rocha
Center for Research and Development of Functional Materials, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil; Corresponding author.
R.A. Renzetti
Institute of Integrated Engineering, Federal University of Itajubá(UNIFEI), Campus Itabira, MG, Brazil
A.M.S. Procopio
Advanced Materials Interdisciplinary Laboratory, Federal University of Itajubá, (UNIFEI), Campus Itabira, MG, Brazil
V.R. Mastelaro
São Carlos Institute of Physics, University of São Paulo (USP), PO Box 369, 13560-970, São Carlos, SP, Brazil
A.Z. Simões
School of Engineering, São Paulo State University (UNESP), 333 Dr. Ariberto Pereira da Cunha Avenue, Portal das Colinas, 12516-410, Guaratinguetá, SP, Brazil
M.A. Ponce
National University of Mar del Plata (UNMdP), Buenos Aires, Argentina
C. Macchi
CIFICEN (UNCPBA-CICPBA-CONICET) and Instituto de Física de Materiales Tandil (UNCPBA), Pinto 399, B7000GHG, Tandil, Argentina
A. Somoza
CIFICEN (UNCPBA-CICPBA-CONICET) and Instituto de Física de Materiales Tandil (UNCPBA), Pinto 399, B7000GHG, Tandil, Argentina
C.M. Aldao
Institute of Scientific and Technological Research in Electronics (ICYTE) University of Mar del Plata and National Research Council (CONICET), Mar del Plata, Argentina
E. Longo
Center for Research and Development of Functional Materials, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil
F. Moura
Advanced Materials Interdisciplinary Laboratory, Federal University of Itajubá, (UNIFEI), Campus Itabira, MG, Brazil
Owing to the global upward trend of accidental carbon monoxide (CO) poisoning in the past 30 years, this work aimed to develop Cobalt-doped CeO2 particles by the microwave-assisted hydrothermal route under distinct conditions. Their structural, morphological, spectroscopic and electrical behaviors were investigated to correlate the influence of Co on their properties with the introduction of oxygen vacancies and their sensing capability to assist in the mitigation of CO poisoning cases. The samples were crystalline and had no secondary phases. Two distinct activation energies for the electrical conduction processes were observed due to dopant influence, corroborating the local cluster-to-cluster charge transfer (CCCT) mechanism, resulting in a response time of only 3s for the 4% Co-doped sample. On the other hand, through positron annihilation studies we showed that the oxygen vacancies are preferentially formed near Co ions, reducing the Co ion charge and leading to the formation of neutral VO-Co+2 complex clusters.
