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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

In situ study of copper reduction in SrTi1-xCuxO3 nanoparticles

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 18, n. 3, p. 2070-2079, JAN 21 2016.
Web of Science Citations: 7
Abstract

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)

FAPESP's process: 13/09573-3 - Synthesis and Characterization of the ZnO/SnO2 Heterostructures obtained by Hydrothermal Method: Gas Sensor Applications
Grantee:Luís Fernando da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral