Surface segregation and consequent so2 sensor response in SnO2-NiO

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114
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Artigo
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2005-08-09
Autores
HIDALGO, P.
CASTRO, R. H. R.
COELHO, A. V. C.
GOUVEA, D.
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Chemistry of Materials
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HIDALGO, P.; CASTRO, R. H. R.; COELHO, A. V. C.; GOUVEA, D. Surface segregation and consequent so2 sensor response in SnO2-NiO. Chemistry of Materials, v.17, n. 16, p. 4149 - 4153, August, 2005.
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Many studies have been carried out concerning the development of SO 2 sensors to detect and avoid its health prejudicial effects. However, there is still a lack of reliable, high-speed-response sensors that work at room temperature. In this work, the segregation of Ni in the SnO 2-NiO system is used to obtain a rapid SO2 sensor response. Segregation and its structure consequences were studied by electron dispersive spectroscopy, infrared spectroscopy, and high-resolution transmission electron microscopy in nanopowders of SnO2-NiO with different compositions prepared by a polymeric precursor method. The sensor activity of SnO2-1 mol % Ni was studied and a linear calibration curve was formed with a maximum limit response of 32 ppm SO2. © 2005 American Chemical Society.

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