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1、SensorsandActuatorsA114(2004)3035Vacuum-depositednanocrystallinepolyanilinethinfilmsensorsfordetectionofcarbonmonoxideS.C.K.Misraa,∗,PrafullMathura,B.K.SrivastavabaNationalPhysicalLaboratory,NewDelhi110012,IndiabNarain(PG)College,Shikohabad,IndiaReceived16August2003;receivedinrevisedfor
2、m26January2004;accepted13February2004Availableonline1April2004AbstractGassensorsbasedonmetaloxidesemiconductorsarewidelyusedfordetectionoftoxicgaseslikeCO.Thesesensorssufferfromthedrawbackoflimitedlifetimeduetotheiroperationathightemperatures.Ontheotherhanditisoftendifficulttoachievehig
3、hsensitivity,selectivity,andspecificityinpresenceofamixtureofgases.Toovercomethis,vacuum-depositednanocrystallinepolyanilinethinfilmshavebeenfoundsuitablefordetectionofcarbonmonoxide.Thesensorsusingthesefilmsoperateatroomtemperature.Ahighsensitivity,selectivity,specificity,andafastresponse
4、timehavebeenachieved.Highsensitivity,selectivity,andspecificityareobtainedbydopingthepolyanilinepowderduringsynthesis.Thesethinfilmsensorsarehighlystable,reliable,andtheirgasdetectionlimitislow.©2004ElsevierB.V.Allrightsreserved.Keywords:GasSensor;Semiconductors;Carbonmonoxide1.Introduct
5、ionoperateatroomtemperature.Recentlytherehasbeenare-markablegrowthinthedevelopmentofelectroactivesemi-Carbonmonoxide,isoneofthemostcommonandconductingpolymerthinfilmsfordetectionofCOgasasdangerouspollutantspresentintheenvironmentduetoanalternative[612].Electroactivepolymericsemiconduc-e
6、missionsfromautomatedvehicles,aircraft,naturalgastorshavealreadybeeninvestigatedfortheirpotentialuseinemission,industrialwastage,sewageleaking,mines,etc.variouselectronicdevicessuchasSchottkydiodes,LEDs,Itspoisonouseffectsonhumanlifearewell-known.Whenphotosensitivedevicesflexibleelectro
7、niccircuitsprintedthelevelofCOrisesbeyondtheminimumlevelintheen-circuitboards,fieldeffecttransistorandelectrochromicvironment,itbecomeslifethreateningandahazard.Itisandmagneticdevices[1317,19,22,23].ElectronicdevicesthereforerequiredtomonitortheCOlevelinthesurround-basedonpolymericsem
