Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 133, Issue 1, Pages 263-269Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.02.021
Keywords
tin oxide; nanoparticle; surface segregation; propane; sensor
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Controlling the surface properties of nanoparticles using ionic dopants prone to be surface segregated has emerged as an interesting tool for obtaining highly selective and sensitive sensors. In this work, the surface segregation of Cd cations on SnO2 nanopowders prepared by the Pechini's method was studied by infrared spectroscopy, X-ray diffraction, and specific surface area analysis. We observed that the surface chemistry modifications caused by the surface segregation of Cd and the large specific surface area were closely responsible for a rapid and regular electrical response of 5 mol% Cd-doped SnO2 films to 100 ppm propane and NO, diluted in dry air at relatively low temperature (100 degrees C). (c) 2008 Elsevier B.V. All rights reserved.
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