资源描述:
《Springer.SAITO.R.&.KATAURA.H.Optical.Properties.and.Raman.Spectroscopy.of.Carbon.Nanotubes_.FROM.CARBON.NANOTUBES.TOPICS.(SPRINGER.2001;.35.p)》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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-tubeswithdifferentdiameters.Theelectronicandphononstructureofsinglewallcarbonnanotubesarereviewed,basedonboththeoreticalconsiderationsandspec-troscopicmeasurements.Thequantumpropertiesof
4、Single-WallCarbonNanotubes(SWNTs)dependonthediameterandchirality,whichisdefinedbytheindices(n,m)[1,2].Chiralityisatermusedtospecifyananotubestructure,whichdoesnothavemirrorsymmetry.ThesynthesisofaSWNTsamplewithasinglechiralityisanultimateobjectiveforcarbonnanotubephysics
5、andmaterialsciencere-search,butthisisstilldifficulttoachievewithpresentsynthesistechniques.Ontheotherhand,thediameterofSWNTscannowbecontrolledsignifi-cantlybychangingthefurnacegrowthtemperatureandcatalysts[3,4,5,6].Thus,amixtureofSWNTswithdifferentchiralities,butwithasmallr
6、angeofnanotubediametersisthebestsamplethatcanbepresentlyobtained.ResonanceRamanspectroscopyprovidesapowerfultooltoinvestigatethegeometryofSWNTsforsuchsamplesandweshowherethatmetallicandsemiconductingcarbonnanotubescanbeseparatelyobservedintheresonantRamansignal.Inthispa
7、per,wefirstreviewtheoreticalissuesconcerningtheelectronandphononpropertiesofasingle-walledcarbonnanotube.WethendescribetheelectronicandphonondensityofstatesofSWNTs.InordertodiscussresonantRamanexperiments,wemakeaplotofthepossibleenergiesofopticaltransitionsasafunctionoft
8、hediameterofSWNTs.Thenwereviewexperimentalissuesconcerningthediameter-controlledsynthesisofSWNTsandRamanspectr