Springer.SAITO.R.&.KATAURA.H.Optical.Properties.and.Raman.Spectroscopy.of.Carbon.Nanotubes_.FROM.CARBON.NANOTUBES.TOPICS.(SPRINGER.2001;.35.p)

Springer.SAITO.R.&.KATAURA.H.Optical.Properties.and.Raman.Spectroscopy.of.Carbon.Nanotubes_.FROM.CARBON.NANOTUBES.TOPICS.(SPRINGER.2001;.35.p)

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1、OpticalPropertiesandRamanSpectroscopyofCarbonNanotubesRiichiroSaito1andHiromichiKataura21DepartmentofElectronic-Engineering,TheUniversityofElectro-Communications1-5-1,Chofu-gaoka,Chofu,Tokyo182-8585,Japanrsaito@tube.ee.uec.ac.jp2DepartmentofPhysics,TokyoMetropolitanUniv

2、ersity1-1Minami-Ohsawa,Hachioji,Tokyo192-0397,Japankataura@phys.metro-u.ac.jpAbstract.TheopticalpropertiesandtheresonanceRamanspectroscopyofsinglewallcarbonnanotubesarereviewed.BecauseoftheuniquevanHovesingulari-tiesintheelectronicdensityofstates,resonantRamanspectrosco

3、pyhasprovideddiameter-selectiveobservationofcarbonnanotubesfromasamplecontainingnano-tubeswithdi?erentdiameters.Theelectronicandphononstructureofsinglewallcarbonnanotubesarereviewed,basedonboththeoreticalconsiderationsandspec-troscopicmeasurements.Thequantumpropertiesof

4、Single-WallCarbonNanotubes(SWNTs)dependonthediameterandchirality,whichisde?nedbytheindices(n,m)[1,2].Chiralityisatermusedtospecifyananotubestructure,whichdoesnothavemirrorsymmetry.ThesynthesisofaSWNTsamplewithasinglechiralityisanultimateobjectiveforcarbonnanotubephysics

5、andmaterialsciencere-search,butthisisstilldi?culttoachievewithpresentsynthesistechniques.Ontheotherhand,thediameterofSWNTscannowbecontrolledsigni?-cantlybychangingthefurnacegrowthtemperatureandcatalysts[3,4,5,6].Thus,amixtureofSWNTswithdi?erentchiralities,butwithasmallr

6、angeofnanotubediametersisthebestsamplethatcanbepresentlyobtained.ResonanceRamanspectroscopyprovidesapowerfultooltoinvestigatethegeometryofSWNTsforsuchsamplesandweshowherethatmetallicandsemiconductingcarbonnanotubescanbeseparatelyobservedintheresonantRamansignal.Inthispa

7、per,we?rstreviewtheoreticalissuesconcerningtheelectronandphononpropertiesofasingle-walledcarbonnanotube.WethendescribetheelectronicandphonondensityofstatesofSWNTs.InordertodiscussresonantRamanexperiments,wemakeaplotofthepossibleenergiesofopticaltransitionsasafunctionoft

8、hediameterofSWNTs.Thenwereviewexperimentalissuesconcerningthediameter-controlledsynthesisofSWNTsandRamanspectr

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