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1、13ELSEVIERSensorsandActuatorsB31(1996)71-75TheeffectofPtandPdsurfacedopingontheresponseofnanocrystallinetindioxidegassensorstoCOM.Schweizer-Berbericha,*,J.G.Zhenga,U.Weimara,W.G6pela,N.B~sanb,E.Pentiab,A.TomescubalnstituteofPhysicalandTheoreticalChemistry,CenterofInterfaceAnalysisandS
2、ensors,UniversityofTlibingen,AufderMorgenstelle8,D-72076Ttibingen,GermanyblnstituteofPhysicsandTechnologyofMaterials,POBoxMG-7,Bucharest-Magurele,R-76900,RomaniaAbstractSnO2sensorswerepreparedbyprecipitatingSn(OH)4fromanaqueoussolutionofSnCl4orbyevaporatingSnO2intheUHV.SubsequentX-ray
3、andTEMmeasurementsshowgrainsizesinthenanometerrangeafterannealingatdifferenttemperaturesorannealingtimes.TheeffectofPtandPddopingupontheresponsetoCOisstudied.Parameters,whichwefocusedon,aresensorsignaldependentontheoperatingtemperatureanddependentonthegasconcentration.Theresultsforcer
4、amicsensorsarecomparedwiththoseforthinfilmsensors.Keywords:Tindioxide;Gassensor;PtandPddoping1.Introductionanceimprovementsbyusingmetallicadditives.Theap-proachisdifferentfromtheheuristicone,normallyused,Solid-stategassensorsbasedontindioxidearethebecauseourpurposewasnottoobtainthebes
5、tsensorsbypredominantsolid-statedevicesforgasalarmsusedinatryinglotsofadditives,concentrationsandcalcinationwidevarietyofdomesticandindustrialapplications.temperatures,buttounderstandthemechanismsofper-Theirperformancehasbeendevelopedovertheyears,formanceimprovements.Inthisrespectwefo
6、cusednotmostlyonanempiricalbasis.Theircurrentstatushasonlyonthesensitivityofoursamples,butalsoonthebeenrecentlyreviewedinseveraltextbooks[1-3].Inchangesinthedetectionmechanism.contrasttotheirwidespreadapplication,thepresentun-derstandingofthemechanismofgasdetectionisstillim-2.Experime
7、ntalmature,althoughmanypapershavebeenpublishedonthesefundamentalaspectsinrecentyears[4-6].ThemainWeusedtwotypesoftransducers:FirstlytheclassicalreasonforthisunsatisfactorysituationisthefactthattheTaguchitypewaschosen,consistingofaceramictubestructuralcharacterizationandinparticularthe
8、influ
