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Selectivity improvement of SnO2 films by superficial metallic films

Abstract : The purpose of this paper is to demonstrate the possibility of modifying the sensitivity of tin dioxide (SnO2) films by depositing metallic catalysts on the surface of SnO2 layer. The aim is to reduce the effect of ethanol which is considered as an interfering gas in many domestic or industrial applications. Two catalysts have been so studied (platinum and palladium), deposited on two types of SnO2 layers which present different textures. Both catalysts reduce the sensitivities to ethanol, carbon monoxide and methane. But the decrease of the alcohol sensitivity is more significant and consequently, the relative sensitivities to CO and CH4 are increased. This effect is more important with the SnO2 layers which have a high porosity. An other application where tin dioxide sensors can be used is the automotive application. In this case, nitrogen oxides are considered as interfering gases for the carbon monoxide detection. Several catalysts are studied in order to decrease the influence of nitrogen oxides and especially the conductance decrease under NO2. One of the catalysts which can be used to reduce the nitrogen oxide effect is rhodium. The results obtained with such rhodium films deposited on SnO2 sensors allow us to consider future applications in the automotive field.
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Submitted on : Tuesday, November 17, 2009 - 11:46:02 AM
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Muriel Sauvan, Christophe Pijolat. Selectivity improvement of SnO2 films by superficial metallic films. Sensors and Actuators B: Chemical, Elsevier, 1999, 58, pp.295-301. ⟨10.1016/S0925-4005(99)00147-1⟩. ⟨emse-00432774⟩



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