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《Chemical reactions in the detection of acetone and NO by a CeO2 thin film》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、SensorsandActuatorsB71(2000)36±41ChemicalreactionsinthedetectionofacetoneandNObyaCeO2thin®lma,*aabR.Bene,I.V.Perczel,F.ReÂti,F.A.Meyer,bbM.Fleisher,H.MeixneraDepartmentofAtomicPhysics,TUBudapest,BudafokiuÂt8,1111Budapest,HungarybSiemensCorporateResearch&Development,
2、Otto-Hahn-Ring6,81739Munich,GermanyAccepted22June2000AbstractThisworkpresentsanattempttoapplytheundopedn-typesemiconductorCeO2inthedetectionofgasesÐacetoneandNOÐinanoxygencontainingenvironment.However,insuchgasmixturechemicalreactionsmaytakeplaceatandnearthehotsenso
3、rsurface,changingthecompositionofthegasenvironment.TheeffectofCeO2ÐitscatalyticactivityÐwasstudiedintheoxidationofacetoneandNOduringtheirdetection.Forthispurpose,aparticularexperimentalset-upwasplannedandbuilt:aspecial,¯owtypequartzmicroreactorconnectedtoamassspectr
4、ometer,offeringthepossibilityforsimultaneousresistancemeasurementandanalysisofthenearsensorgascomposition.Thesensorwasoperatedbothinself-andoven-heatedmodebetween20±9008C.ThemaximumsensitivityofCeO2wasfoundbetween350±4508Cforbothgases.Whileacetonecausesawellmeasurab
5、leresistancechange,thesignalduetoNOisquitesmall.TheCeO2surfaceprovedtobecatalyticallyactiveintheoxidationofacetoneresultingintheformationofCO2.Surprisingly,thesamesurfaceledtothereductionofNO.#2000ElsevierScienceB.V.Allrightsreserved.Keywords:CeO2oxidesemiconductor;
6、Gassensor;Acetone;NO1.Introductionphasechangingitslocalcomposition.Asthesensorsingeneralaresmallandspeciallydesigneddevices,theirOxidesemiconductorbasedsensorshavebeencommer-catalyticactivityisdif®culttobestudied.ciallyavailableformanyyears.Accordingtomarketneeds,Fo
7、rthispurpose,aspecialdeviceisneeded:aninstrumentastablesensormaterialworkingathightemperatureisthatcombinesthepossibilitiestomeasurethesensorresis-desirableforchemicalorvehicleindustry.tanceandtoanalysewithhighaccuracythecompositionofCericoxideisann-typesemiconducto
8、r[1];itisaquitethenearsurfacegasregion.Inthiswork,suchanequipmentnewsensormaterialandseemsto®ttheaboverequirements.ofourdevelopment[4]wass
