High-performance CeO₂:Co nanostructures for the elimination of accidental poisoning caused by CO intoxication

Author(s):Show less -

Carvalho, J. C. L. ; Rocha, L. S. R. ; Renzetti, R. A. ; Procopio, A. M. S. ; Mastelaro, V. R. ; Simoes, A. Z. ; Ponce, M. A. ; Macchi, C. ; Somoza, A. ; Aldao, C. M. ; Longo, E. ; Moura, F.

• Document type: Journal article
• Source: OPEN CERAMICS; v. 12, p. 9-pg., 2022-12-01.

Abstract

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. (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