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1、SensorsandActuatorsB125(2007)5559DielectrophoreticallyassembledpolymernanowiresforgassensingYapingDana,∗,YanyanCaob,TomE.Malloukb,AlanT.Johnsona,c,StephaneEvoydaDepartmentofElectricalandSystemsEngineering,UniversityofPennsylvania,Philadelphia,PA19104,USAbDe
2、partmentofChemistry,PennsylvaniaStateUniversity,CollegePark,PA16802,USAcDepartmentofPhysicsandAstronomy,UniversityofPennsylvania,Philadelphia,PA19104,USAdDepartmentofElectricalandComputerEngineeringandNationalInstituteforNanotechnology,UniversityofAlberta,E
3、dmonton,ABT6G2V4CanadaReceived12October2006;receivedinrevisedform22January2007;accepted23January2007Availableonline3February2007AbstractWemeasuredtheelectronicpropertiesandgassensingresponseofnanowirescontainingsegmentsofpoly(3,4-ethylenedioxythiophene)/pol
4、y(styrenesulfonate)(PEDOT/PSS)thatweresynthesizedusinganodicaluminumoxide(AAO)membranes.Thenanowireshaveastripedstructureofgold-PEDOT/PSS-goldandaretypically8mlong(1m-6m-1mforeachsection,respectively)and220nmindiameter.Dielec-trophoreticassemblywasusedt
5、opositionsinglenanowiresonpre-fabricatedgoldelectrodes.Apolymerconductivityof11.5±0.7S/cmandacontactresistanceof27.6±4kwereinferredfromresistancemeasurementsofnanowiresofvaryinglengthanddiameter.Whenusedasgassensors,thewiresshowedaresistancechangeof10.5%,9
6、%,and4%atthesaturationvaporpressureofacetone,methanolandethanol,respectively.Sensorresponseandrecoverywererapid(seconds)withexcellentreproducibilityintimeandacrossdevices.Stripedtemplate-grownnanowiresarethusintriguingcandidatesforuseinelectronicnosevaporse
7、nsingsystems.©2007ElsevierB.V.Allrightsreserved.Keywords:Polymer;Nanowire;Vaporsensor;Dielectrophoreticassembly1.Introductionnanowiresensingelementspossesssignificantlyincreasedsensitivityoverthinfilmssensorsduetotheone-dimensionalThedevelopmentofalow-poweran
8、dlow-footprintintegratedconfinementofcarriersinsuchstructuresandtheirhighsurface-sensingarraytechnologywillopenvastmarketsspanningawideto-volumeratio[3].Inaddition,dielectrophoreticassemblycanvarietyofa
