6533b7cffe1ef96bd12597d4
RESEARCH PRODUCT
Co-adsorption processes, kinetics and quantum mechanical modelling of nanofilm semiconductor gas sensors
Theodor DollJuan-jesús Velasco-vélezJuan-jesús Velasco-vélezThomas HaasUlrich Kunzesubject
business.industryChemistryKineticsSurfaces and InterfacesCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAdsorptionSemiconductorChemical physicsElectric fieldMaterials ChemistryMoleculePhysical chemistryElectrical and Electronic EngineeringbusinessQuantumdescription
A quantum mechanical model of co-adsorption on semiconductor surfaces is developed and successfully adopted towards exposure to several gases. It is related to nanofilms and thus allows the application of electric fields altering the electronic surface properties of adsorption centres (electro-adsorptive effect, EAE). The model is matched against experimental data with O 2 , NO 2 and CO measurements under the hypothesis of no direct interaction among the species. However the sequence of adsorption plays an important role where the adsorption of one gas species is opening up other sites that are filled by another sort of impinging molecules. Quantum mechanical modelling of co-adsorption: (a) NO 2 and CO present at the SnO 2 surface. (b) Simplified model. (c) Probability of adsorption.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-03-29 | physica status solidi (a) |