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1、OPENExploringelectronicstructureofone-atomthickpolycrystallinegraphenefilms:ASUBJECTAREAS:ELECTRONICPROPERTIESnanoangleresolvedphotoemissionstudyANDDEVICESELECTRONICPROPERTIESAND111222MATERIALSJose´Avila,IvyRazado,Ste´phaneLorcy,RomainFleurier,EmmanuellePichonat,Dominiqu
2、eVignaud,XavierWallart2&Marı´aC.Asensio1ELECTRONICDEVICESFLOWCHEMISTRY12SynchrotronSOLEIL,L’OrmedesMerisiers,SaintAubin-BP48,91192GifsurYvetteCedex,France,IEMN,UMRCNRS8520,Av.Poincare´,PObox60069,59652,Villeneuved’AscqCedex,France.Received10April2013Theabilitytoproducela
3、rge,continuousanddefectfreefilmsofgrapheneispresentlyamajorchallengeforAcceptedmultipleapplications.Eventhoughthescalabilityofgraphenefilmsiscloselyassociatedtoamanifest30July2013polycrystallinecharacter,onlyafewnumbersofexperimentshaveexploredsofartheelectronicstructure
4、Publisheddowntosinglegraphenegrains.Herewereportahighresolutionangleandlateralresolvedphotoelectron14August2013spectroscopy(nano-ARPES)studyofone-atomthickgraphenefilmsonthincopperfoilssynthesizedbychemicalvapordeposition.OurresultsshowtherobustnessoftheDiracrelativistic
5、-likeelectronicspectrumasafunctionofthesize,shapeandorientationofthesingle-crystalpristinegrainsinthegraphenefilmsinvestigated.Moreover,bymappinggrainbygraintheelectronicdynamicsofthisuniqueDiracsystem,weCorrespondenceandshowthatthesingle-graingap-sizeis80%smallerthanthe
6、multi-graingaprecentlyreportedbyclassicalrequestsformaterialsARPES.shouldbeaddressedtoM.C.A.(asensio@raphene,atwo-dimensionalhoneycomblatticeofbondedcarbonatoms,isastrong,stretchableandsynchrotron-soleil.fr)1Gimpermeableconductingmembrane.Itpossesseschemicalstability,opt
7、icaltransparencyandextremelyhighcarriermobilityamongothersurprisingproperties,however,theseremarkableattributesarehardly2exploitedtillreliablescalablegraphenefilmscouldbeattained.Mechanicalexfoliationofgraphitecanproduce3,4high-qualitygraphene,butthesizeoftheavailablefla
8、kesisrathersmallGraphitizationofSiCcrystalsand5–9carbonevaporationonSiCsubstrateshavesuccessfullygrownl
