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1、ChemicalPhysicsLetters433(2006)105–109www.elsevier.com/locate/cplettGassensingpropertiesofprintedmultiwalledcarbonnanotubesusingthe?eldemissione?ecta,dbbcdYangDooLee,Woo-SungCho,Seung-ILMoon,Yun-HiLee,JaiKyeongKim,ab,*SahnNahm,Byeong-KwonJuaDepartmentofMaterialsScienceandEngineering,KoreaUnive
2、rsity,Anam-dong,Seongbuk-gu,Seoul136-713,RepublicofKoreabDisplayandNanosystemLaboratory,CollegeofEngineering,KoreaUniversity,Anam-dong,Seongbuk-gu,Seoul136-713,RepublicofKoreacDepartmentofPhysics,KoreaUniversity,Anam-dong,Seongbuk-gu,Seoul136-713,RepublicofKoreadOptoElectronicMaterialsResearch
3、Center,KoreaInstituteofScienceandTechnology,39-1Hawolgok-dong,Seongbuk-gu,Seoul136-791,RepublicofKoreaReceived1September2006;in?nalform30October2006Availableonline7November2006AbstractGassensorsforNO2detectionwerefabricatedusingprintedmultiwalledcarbonnanotubes(MWCNTs)beforeandafterelectric?el
4、dsurfacetreatment.PrintedMWCNTsshowedanincreaseofsensitivityuponexposuretoNO2and?eldemissionduetoverticalalign-mentandprotrusionofCNTsfromsurfacelayerafterelectric?eldsurfacetreatment.Electron?eldemissionplaysarolerecoverywhenexposedtogasmoleculesinCNT.AFastrecoverytimeoftheprintedMWCNTgassens
5、orwasobtainedbyohmicheatwithapartial?eldemissione?ectatroomtemperature.ó2006ElsevierB.V.Allrightsreserved.1.Introductionconductingpropertyofdecreasingresistanceuponexpo-sureofNO2gas[6–8].CNTsensorsrequirethermal-heatCarbonnanotubes(CNTs)haveattractedgreatinteresttodesorbthechemisorbedmolecules
6、fromthesurface.duetotheiruniqueelectronicpropertiesandnanometerThesensorexhibitsvariationoftheelectricalresistancesize.Becauseoftheseuniqueproperties,theyaregreatofCNT?lmsintheadsorption–desorptioncyclesandpotentialcandidatesinmanyimportantapplicationssuchreproduciblerecoveryintheoperatingtemp
7、eraturerangeasnanoscaleelectronicdevices,chemicalsensorsand?eldof25–250°C[6–9].Especially,for?eldemitters,CNTsemitters.Thee?ectofgasadsorptionontheelectricalresis-haveasmalldiameterandagreataspectratioaswellastanceofaCNThasreceivedgreat
