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1、30March2001ChemicalPhysicsLetters337,2001)31±35www.elsevier.nl/locate/cplettCarbonnanotubes:Athermoelectricnano-noseClementK.W.Adu,GaminiU.Sumanasekera,BhabendraK.Pradhan,HugoE.Romero,PeterC.Eklund*DepartmentofPhysics,ThePennsylvaniaStateUniversity,104DaveyLaboratory,UniversityPa
2、rk,PA16802-6300,USAReceived11December2000AbstractAthermoelectric`nano-nose'hasbeenbuiltfromtangledbundlesofsingle-walledcarbonnanotubes,SWNT).Theresponseisspeci®ctothedetailsoftheinteractionoftheadsorbedmoleculewiththenanotubewall;evengasessuchasHe,N2andH2canbeeasilydetected.Plot
3、sofDSvs:qaaresensitivetowhetheroxidationorreductionofthetubewallistakingplace,andtowhetherthegasmoleculeisphysisorbedorchemisorbed.Ó2001ElsevierScienceB.V.Allrightsreserved.Asingle-walledcarbonnanotube,SWNT)cantunnelingmicroscopy[7],opticalabsorptionbeenvisionedasamonolayergraphe
4、nesheetrol-spectroscopy[8,9]andtheoreticalcalculations[10]ledupintoalongseamlesscylinder[1].Firstre-reportthatthesemiconductinggapEgap0:6eV.portedintheproductsofanelectricarcin1993bySimilartographite,SWNTsareamphotericresearchscientistsinNEC-Tsukuba[2]andIBM-[11,12].Thatis,theyc
5、anbedopedbyelectronAlmaden[3],andlaterproducedinmuchmoredonorsoracceptorsthatattachtothetubewall,signi®cantquantitiesandhigherpuritybypulsedremovingoraddingelectronstothecarbonplaservaporizationatRiceUniversity[4],theseelectronconductionbands.molecular®lamentsarenowunderactiveinv
6、esti-ThebundlestructureofSWNTsproducesatgationforavarietyoffundamentalreasons,asleastfourdistinctsitesinwhichgasmoleculescanwellaspotentialnewtechnologies[5].Boththeadsorb,seeFig.1):ontheexternalbundlesurface,electricarcandthelaserproducewell-ordered,inagrooveformedatthecontactbe
7、tweenadjacenttightlypackedbundlesoftubescontainingtenstotubesontheoutsideofthebundle,withinanin-hundredsofSWNTs[6,4].Withinabundle,theteriorporeofanindividualtube,andinsideantubesareboundtogetherbyaweakvanderWaalsinterstitialchannelformedatthecontactofthreeforce.Ifalltheallowedhe
8、licitiesarestatisticallytubesinthebundle
