Investigations on the Temperature-Dependent Interaction of Water Vapor with Tin Dioxide and Its Implications on Gas Sensing
David Degler, Benjamin Junker, Frank Allmendinger, Udo Weimar, Nicolae Bârsan
Abstract
surfaces and discusses the possible implications on the oxygen ionosorption and gas-sensing mechanism. The impact of water on the sensor resistance, CO-sensing performance, and CO conversion was studied, and the obtained phenomenological results provide the basis for discussing the operando spectroscopic investigation findings. The provided information allows identification of three different water adsorption regimes ranging from physisorption and dominant associative adsorption to mainly dissociative water adsorption. In these regions, water has different impacts on the surface composition, sensor resistance, and gas-sensing performance.
Topics & Concepts
PhysisorptionAdsorptionTin dioxideWater vaporMaterials scienceChemical engineeringChemical physicsOxygenNanotechnologyChemistryPhysical chemistryOrganic chemistryMetallurgyEngineeringGas Sensing Nanomaterials and SensorsAdvanced Chemical Sensor TechnologiesAnalytical Chemistry and Sensors