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1、APPLIEDPHYSICSLETTERSVOLUME83,NUMBER1910NOVEMBER2003Nerveagentdetectionusingnetworksofsingle-walledcarbonnanotubesa)b)J.P.Novak,E.S.Snow,E.J.Houser,D.Park,J.L.Stepnowski,andR.A.McGillNavalResearchLaboratory,Washington,DC20375~Received10June2003;accepted18Sep
2、tember2003!Wereporttheuseofcarbonnanotubesasasensorforchemicalnerveagents.Thin-?lmtransistorsconstructedfromrandomnetworksofsingle-walledcarbonnanotubeswereusedtodetectdimethylmethylphosphonate~DMMP!,asimulantforthenerveagentsarin.Thesesensorsarereversiblean
3、dcapableofdetectingDMMPatsub-ppbconcentrationlevels,andtheyareintrinsicallyselectiveagainstinterferentsignalsfromhydrocarbonvaporsandhumidity.Weprovideadditionalchemicalspeci?citybytheuseof?lterscoatedwithchemoselectivepolymer?lms.Theseresultsindicatethatthe
4、electronicdetectionofsub-ppbconcentrationsofnerveagentsandpotentiallyotherchemicalwarfareagentsispossiblewithsimple-to-fabricatecarbonnanotubedevices.?2003AmericanInstituteofPhysics.@DOI:10.1063/1.1626265#Semiconductingsingle-walledcarbonnanotubesfectivetran
5、sferofnegativechargethatmanifestsitselfasa~SWCNTs!areuniquestructuresinthattheyarecomposedshiftofthetransistorthresholdvoltage.Themolecularad-entirelyofsurfaceatoms,whileexhibitingtransportproper-sorptionisfullyreversiblebyapplyingasmallpositivegate1,2biasth
6、atreleasestheDMMPfromthenanotubesurface.Thetiessuperiortosingle-crystallineSi.ThesefeaturesmakeSWCNTsanidealcandidatematerialforanewclassofmo-SWCNT-basedsensorsarecapableofdetectingDMMPatlecularsensors.Researchershavedemonstratedthatindi-sub-ppbconcentration
7、levels,andtheyareintrinsicallyselec-vidualsemiconductingSWCNTdevicesproducealargere-tiveagainstcommoninterferents.Inaddition,wedemon-sistancechangeinresponsetocertaintypesofgaseousstrateanapproachtoachievingchemicalspeci?citythatusesanalytes.3±5Insuchsensors
8、,theadsorptionofananalyte?lterscomposedofchemiselectivepolymers.Theseresultsmoleculewithstrongelectrondonororacceptorpropertiesindicatethattheelectronicdetectionofsub-ppbconcentra-resultsinapart
