Conducting polypyrrole modified with ferrocene for applications in CO sensors

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1、SensorsandActuatorsB125(2007)6065ConductingpolypyrrolemodifiedwithferroceneforapplicationsincarbonmonoxidesensorsS.Radhakrishnan∗,SanthoshPaulPolymerScienceandEngineering,NationalChemicalLaboratory,Pune411008,IndiaReceived22May2006;receivedinrevisedform22January2007;accepted22Ja

2、nuary2007Availableonline31January2007AbstractPolypyrrole(PPy)wasmodifiedwithferrocene(Fc)bydirectincorporationduringpolymerizationsoastoincreaseitssensitivityforcar-bonmonoxide(CO)gassensorapplications.Synthesiswascarriedoutbychemicaloxidativepolymerizationinthepresenceofferroce

3、neusingferricchloride.ThepresenceofthesespeciesinPPywasconfirmedbydifferentcharacterizationtechniques.TheCOresponsemea-surementswerecarriedoutforthesensorsfabricatedinasurfacecellmodewithactivePPy+FcfilmsbyexposingtoCOgas(300ppm)atroomtemperatureanditwasfoundthattheresponseaswell

4、astherecoverycharacteristicsofthesematerialsisveryfastanddependentonthefilmcomposition.Theresponsefactorwasfoundtobemaximumfora1.32mol%Fccontentinthepolymer.ThesevariousresultscanbeexplainedonthebasisofinteractionofCOmoleculeswithFeatomsoftheferrocenetogetherwithchargetransferin

5、teractionwiththePPychain.©2007ElsevierB.V.Allrightsreserved.Keywords:Carbonmonoxide;Chemicalsensor;Polypyrrole;Ferrocene;Ironcomplexes1.Introductioningorganicsubstancessuchasporphyrins,phthalocyaninesanddopedconductivepolymers[810]fortheseapplications.OnTheimportanceofenvironme

6、ntalgasmonitoringisnowtheotherhand,thedetectionofcarbonmonoxideusingsuchrecognizedasanimportantareaandmuchresearchhasbeenpolymersisnotextensivelystudied.Conventionally,carbonfocusedonthedevelopmentofsuitablegas-sensitivematerialsmonoxide(CO)hasbeendetectedmostlybyusingacatalyst

7、forcontinuousmonitoringandsettingoffalarmsforhazardouswhichisheldathightemperatureandsubsequentlymonitor-chemicalvaporspresentbeyondspecifiedlevels[1,2].Con-ingthechangesinthetemperatureduetothereactionwithaductingpolymersaregoodcandidatesforthedevelopmentofhelpofthermistor/pell

8、istor[1113].MOSFETtypegassensorschemicalorelectrochemi