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Chemical Analysis with Tin Oxide Gas Sensors: Choice of Additives, Method of Operation and Analysis of Numerical Signal

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It is demonstrated that the chemical analysis capability with tin oxide gas sensors can be considerably enhanced when the sensors are operated thermocyclically and the sensor signals are numerically analyzed. The choice of the additive is of high influence on the surface reaction processes reflected in characteristic features of the conductance-over-time-profiles used for numeric determination of the gas analysis. This was shown for different SnO2/additive gas sensitive materials (additives: Co3O4, CuO, PdO, La2O3, NASICON). For instance, dissolved ethanol/toluene mixtures were analysed with a determination error of less than 10%.
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Document Type: Research Article

Publication date: December 1, 2008

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