Gas sensing properties of printed multiwalled carbon nanotubes using the field emission effect

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1、ChemicalPhysicsLetters433(2006)105–109www.elsevier.com/locate/cplettGassensingpropertiesofprintedmultiwalledcarbonnanotubesusingthefieldemissioneffecta,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;infinalform30October2006Availableonline7November2006AbstractGassensorsforNO2detectionwerefabricatedusingprintedmultiwalledcarbonnanotubes(MWCNTs)beforeandafterelectricfiel

4、dsurfacetreatment.PrintedMWCNTsshowedanincreaseofsensitivityuponexposuretoNO2andfieldemissionduetoverticalalign-mentandprotrusionofCNTsfromsurfacelayerafterelectricfieldsurfacetreatment.ElectronfieldemissionplaysarolerecoverywhenexposedtogasmoleculesinCNT.AFastrecoverytimeoftheprintedMWCNTgassens

5、orwasobtainedbyohmicheatwithapartialfieldemissioneffectatroomtemperature.Ó2006ElsevierB.V.Allrightsreserved.1.Introductionconductingpropertyofdecreasingresistanceuponexpo-sureofNO2gas[6–8].CNTsensorsrequirethermal-heatCarbonnanotubes(CNTs)haveattractedgreatinteresttodesorbthechemisorbedmolecules

6、fromthesurface.duetotheiruniqueelectronicpropertiesandnanometerThesensorexhibitsvariationoftheelectricalresistancesize.Becauseoftheseuniqueproperties,theyaregreatofCNTfilmsintheadsorption–desorptioncyclesandpotentialcandidatesinmanyimportantapplicationssuchreproduciblerecoveryintheoperatingtemp

7、eraturerangeasnanoscaleelectronicdevices,chemicalsensorsandfieldof25–250°C[6–9].Especially,forfieldemitters,CNTsemitters.Theeffectofgasadsorptionontheelectricalresis-haveasmalldiameterandagreataspectratioaswellastanceofaCNThasreceivedgreat