Use of cobalt oxide CoOOH in a carbon monoxide sensor operating at low temperatures

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1、SensorsandActuatorsB120(2006)104109UseofcobaltoxideCoOOHinacarbonmonoxidesensoroperatingatlowtemperaturesRen-JangWua,∗,Jhih-GanWua,Tung-KangTsaib,Chuin-TihYehcaDepartmentofAppliedChemistry,ProvidenceUniversity,200ChungchiRoad,Shalu,TaichungHsien433,Taiwan,ROCbCen

2、terforMeasurementStandards,IndustrialTechnologyResearchInstitute,NationalTsinghuaUniversity,Hsinchu30043,Taiwan,ROCcDepartmentofChemistry,NationalTsinghuaUniversity,Hsinchu30043,Taiwan,ROCReceived1August2005;receivedinrevisedform26January2006;accepted26January200

3、6Availableonline13March2006AbstractCobaltoxideCoOOHwaspreparedfromaCo(NO3)2solutionviaaprecipitationwithNaOHandoxidationinair.ThepreparedsampleswerecharacterizedbyX-raydiffraction(XRD),temperatureprogramreduction(TPR),andthermo-gravimetric/differentialthermalanal

4、ysis(TG/DTA)techniques.TheresultingCoOOHwasusedasasensingmaterialinasemiconductortypeCOsensor.TheoptimumCOdetectionworkingtemperaturewasfoundtobe80◦C(S=6.7)inthisstudy,whiletheresponsetimewasshort(∼1min).CoOOHhasbetterresponsethanCoOat34lowtemperaturesandcandetec

5、tCOconcentrationof1ppm.CoOOHoffershighCOdetectionselectivityrelativetoH2(SCO/SH2∼4)andgoodlinearity(R2=0.9903)forCOconcentrationsrangingfrom1to1000ppm.AprobableexplanationoftheCOsensingcharacteristicsofCoOOHisproposed.©2006ElsevierB.V.Allrightsreserved.Keywords:C

6、oOOH;COsensor;Response;TPR1.Introductionofoscillationresistance[8].ThinfilmsofCuClhavebeenused[9]forCOsensorstosenseH2-richstreamsinfuelcells.Carbonmonoxidesensorsarewidelyusedinmanyroles,suchTheforegoingtypesofCOsensorshavehighworkingcon-asmeasuringtheCOconcentra

7、tionoftheindooratmosphere,centrationsintherangeof400800ppm[8]and1000ppm[9],vehicleemissions,naturalgasemissions,andindustrialwaste,respectively.etc.Severaldifferentsensingtechnologies,includingelectro-Ithasbeenfound[17,18]thatthecatalystCo3O4canfacili-chemical[1]

8、,optical[2],potentiometric[3,4],andresistivetatetherapidoxidationofCOatatemperatureof200◦Corless.[515],havebeenemployedtodetermineCOconcentration.Byusingcobalt