Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 108, Issue 1-2, Pages 34-40Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2004.09.045
Keywords
TiO2; hydrothermal; Au; additives; gas sensor
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Nanocrystalline titanium dioxide after hydrothermal treatment was loaded singly or doubly with various metals or metal oxides (Au, Ag, Pt, Pd, Cu, Co, Nb, V). Hydrothermally treated TiO2 exhibited enhanced thermal stability: resistance to grain growth and phase transformation. Incorporation of metal additives further decreased the grain size of titania, while the phase transition was generally promoted, except in the case of Au and Pd, which maintained predominant anatase phase at 800 degrees C. Among the different additives tested, An was found to be the most attractive promoter for the CO sensing properties. Therefore, studies were extended to several An concentrations on TiO2 and, in addition, to simultaneous loads of An and Nb or V Doubly modified Au- and Nb-TiO2 presented the highest Au content on surface, as inferred from XPS measurements, and exhibited the largest and fastest sensor response to CO at high operating temperatures. (c) 2004 Elsevier B.V. All rights reserved.
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