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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.)

Local Structure and Surface Properties of CoxZn1-xO Thin Films for Ozone Gas Sensing

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Author(s):
Catto, Ariadne C. ; da Silva, Luis F. ; Bernardi, Maria Ines B. ; Bernardini, Sandrine ; Aguir, Khalifa ; Longo, Elson ; Mastelaro, Valmor R.
Total Authors: 7
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 8, n. 39, p. 26066-26072, OCT 5 2016.
Web of Science Citations: 20
Abstract

A detailed study of the structural, surface, and gas-sensing properties of nanostructured CoxZn1-xO films is presented. X-ray diffraction (XRD) analysis revealed a decrease in the crystallization degree with increasing Co content. The X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopies (XPS) revealed that the Co2+ ions preferentially occupied the Zn2+ sites and that the oxygen vacancy concentration increased as the amount of cobalt increased. Electrical measurements showed that the Co dopants not only enhanced the sensor response at low ozone levels (ca. 42 ppb) but also led to a decrease in the operating temperature and improved selectivity. The enhancement in the gas-sensing properties was attributed to the presence of oxygen vacancies, which facilitated ozone adsorption. (AU)

FAPESP's process: 12/15170-6 - Synthesis and characterization of ZnO thin and thick films : application as gas sensors
Grantee:Ariadne Cristina Catto
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
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 type: Scholarships in Brazil - Post-Doctorate