Selective COnext term gas detection of CuO- and ZnO-doped SnO2 gas previous termsensor

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1、SensorsandActuatorsB75*2001)56±61SelectiveCOgasdetectionofCuO-andZnO-dopedSnO2gassensor*JiHaengYu,GyeongManChoiDepartmentofMaterialsScienceandEngineering,PohangUniversityofScienceandTechnology,San31,Hyojadong,Pohang790-784,SouthKoreaReceived7March2000;receivedinrevisedform1August200

2、0;accepted6November2000AbstractCuO*1±10mol%)andZnO*3mol%)wereindependentlyorsimultaneouslyaddedtoSnO2tochangetheselectivitybetweenCOandH2gasesofpellet-typeSnO2sensor.Theeffectsoftheadditivesontheelectricalconductivityandthusthesensitivityto200ppmCOand200ppmH2gaseswereexaminedinthete

3、mperaturerangefrom80to4508C.TheelectricalconductivityofSnO2wasdrasticallydecreasedbytheadditionofeitherCuOorZnO.CuOadditiontoSnO2loweredthetemperatureshowingthemaximumsensitivityvalueforeitherCOorH2gases.Ontheotherhand,ZnOadditionmadeSnO2tobemoresensitivetoH2gasathighertemperatures.

4、Consequently,SnO2sensorco-dopedwithZnOandCuOshowedahighselectivitytoCOgas*SCO=SH25)at1608C.#2001ElsevierScienceB.V.Allrightsreserved.Keywords:SnO2;ZnO;CuO;COsensor;Selectivity1.IntroductionForthecommercialsemiconductorsensors,noblemetalcatalystssuchasPdandPtwerewidelyusedtoimprove

5、theSemiconductorgassensorsbasedonSnO2havebeensensitivityandtheselectivitytoCOgas[15].Theygenerallyresearchedextensivelyforseveraldecades.Manystudieslowerthesensingtemperatureandincreasethemaximumwerefocusedontheselectivityimprovementtominimizesensitivityandtheresponseratesbycatalyti

6、creaction.ManyC2H5OHorH2interferenceinmonitoringCOorCH4.Thekindsofoxideadditiveswerealsoinvestigated[16].How-interferenceofC2H5OHhasbeenavoidedbyadding®ltersever,thecatalyticeffectoftheoxideadditiveswasnotsuchasactivecharcoal[1,2].Thedisadvantagesof®ltersthoroughlyunderstoodsincethe

7、microstructuralchangeinvolvetheirpossiblesaturationandthesubsequentbreak-wasalsoaccompaniedbytheadditionofsecondaryphasethroughofgasesthatmustbeheldback[3].TheanalysisforthesensitivityofSnO2.oftransientsensorresponsetothechangeofsensortem-Inthisstudy,ZnOandCuOwereaddedtoSnO2astheper

8、atureisanotherappro