In situ study of copper reduction in SrTi1-xCuxO3 nanoparticles

Autor(es)

Coletta, Vitor C. ^[1] ; Marcos, Francielle C. F. ^[2] ; Nogueira, Francisco G. E. ^[2] ; Bernardi, Maria I. B. ^[1] ; Michalowicz, Alain ^[3] ; Goncalves, Renato V. ^[1] ; Assaf, Elisabete M. ^[2] ; Mastelaro, Valmor R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Paris Est Creteil Val de Marne, ICMPE CNRS, Thiais - France

• Tipo de documento: Artigo Científico
• Fonte: Physical Chemistry Chemical Physics; v. 18, n. 3, p. 2070-2079, JAN 21 2016.
• Citações Web of Science: 7

Resumo

Perovskite strontium titanate is a promising functional material for gas sensors and catalysis applications. Herein, we report the preparation of SrTi1-xCuxO3 nanoparticles with Cu doped in the B sites using a modified polymeric precursor method. This study describes in detail the structural and local atomic configurations for the substitution of Cu into the titanium sites and its reducibility using X-ray diffraction (XRD), field emission gun scanning and transmission electron microscopies (FEG-SEM and TEM), X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR) analyses. Our results indicate that copper is segregated for x >= 0.06. After exposing the samples to a hydrogen-rich atmosphere at temperatures over 500 K, copper is reduced from Cu2+ to metallic Cu. This reduction was attributed to copper atoms that originated primarily from the CuO phase. (AU)

• Processo FAPESP: 13/09573-3 - Síntese e Caracterização de Heteroestruturas de ZnO/SnO2 obtidas pelo Método Hidrotermal: Aplicação como Sensores de Gás
• Beneficiário: Luís Fernando da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado