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1、SensorsandActuatorsB118(2006)232242Carbonnanotubesthin?lms?beropticandacousticVOCssensors:PerformancesanalysisMarcoConsalesa,StefaniaCampopianoa,AntonelloCutoloa,MichelePenzab,PatriziaAversab,GennaroCassanob,MicheleGiordanoc,AndreaCusanoa,?aOptoelectronicDi
2、vision,DepartmentofEngineering,UniversityofSannio,82100Benevento,ItalybENEA,C.R.Brindisi,MaterialsandNewTechnologiesUnit,72100Brindisi,ItalycInstituteforCompositeandBiomedicalMaterials,CNR,80124Napoli,ItalyAvailableonline30May2006AbstractThisworkisfocusedon
3、theperformancesanalysisofsilicaoptical?ber(SOF)andquartzcrystalmicrobalance(QCM)volatileorganiccompounds(VOCs)sensors,coatedbysingle-walledcarbonnanotubes(SWCNTs)multilayers,towardstolueneandxylenevapors,atroomtemperature.TheLangmuir-Blodgett(LB)techniqueha
4、sbeenusedforthedepositionofcarbonnanotubesdirectlyontotheopticalandacousticsensorssubstrates.AtimedivisionmultiplexingapproachhasbeenusedinordertosimultaneouslytestuptoeightSOFandsixQCMchemicalsensorsinthesametestchamber.Theresultsobtaineddemonstrategoodsen
5、sitivity,fastresponseandhighrepeatabilityprovidedbytheproposedsensorsevenatverylowconcentrations.Resolutionsintheppmandsub-ppmrangehavebeenfoundtowardsthetestedVOCs,forbothopticalandacoustictransducers.TheeffectsoftheSWCNTs?lmthicknessandevenofacadmiumarach
6、idate(CdA)buffermultilayer,exploitedinthepasttoimprovetheadhesionofnanotubesontothesensorssubstrates,ontheperformancesofSOFandQCMtransducershavebeeninvestigated.Totheaim,severalopticalandacousticsensorswithadifferentnumberofSWCNTsLBlayers,directlydepositedo
7、ntooptical?bersandquartzsurfacesandbufferedbyaCdAlinkermaterial,havebeenfabricatedandsimultaneouslyexposed,atroomtemperature,todifferentconcentrationpulsesoftolueneandxylene.TheresultsobtaineddemonstratethepossibilitytousethedatacomingfromcarbonnanotubesSOF
8、andQCMsensorstoimprovetheVOCdiscriminationbymeansofthehybridsystembasedonthesetwocomplementarytransducersbypatternrecognitionmethods.?2006ElsevierB.V.Allrightsreserved.Keywords:Carbonnanotubes;LBdeposi
