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1、GrainsandGrainBoundariesinSingle-LayerGrapheneAtomicPatchworkQuilts112PinshaneY.Huang*,CarlosS.Ruiz-Vargas*,ArendM.vanderZande*,WilliamS.23431Whitney,MarkP.Levendorf,JoshuaW.Kevek,ShivankGarg,JonathanS.Alden,CalebJ.513,62,61,5Hustedt,YeZhu,JiwoongPark,PaulL.McEuen,DavidA.Muller1.SchoolofAppliedandE
2、ngineeringPhysics,CornellUniversity,Ithaca,NY14853,USA2.DepartmentofPhysics,CornellUniversity,Ithaca,NY14853,USA3.DepartmentofChemistryandChemicalBiology,CornellUniversity,Ithaca,NY14853,USA4.DepartmentofPhysics,OregonStateUniversity,Corvallis,OR97331,USA5.DepartmentofPhysicsandAstronomy,BrighamYou
3、ngUniversity,Provo,UT84602,USA6.KavliInstituteatCornellforNanoscaleScience,Ithaca,NY14853,USA*Theseauthorscontributedequallytothiswork.Thepropertiesofpolycrystallinematerialsareoftendominatedbythesizeoftheirgrainsandbytheatomicstructureoftheirgrainboundaries.Theseeffectsshouldbeespeciallypronounced
4、intwo-dimensionalmaterials,whereevenalinedefectcandivideanddisruptacrystal.Theseissuestakeonpracticalsignificanceingraphene,ahexagonaltwo-dimensionalcrystalofcarbonatoms;Single-atom-thickgraphenesheetscannowbe1-34producedbychemicalvapordeposition(CVD)onuptometerscales,makingtheirpolycrystallinityal
5、mostunavoidable.Theoretically,graphenegrainboundariesare5-89107,11-13predictedtohavedistinctelectronic,magnetic,chemical,andmechanicalpropertieswhichstronglydependontheiratomicarrangement.Yet,becauseofthefive-order-of-magnitudesizedifferencebetweengrainsandtheatomsatgrainboundaries,fewexperimentsha
6、vefullyexploredthegraphenegrainstructure.Here,weuseacombination1ofoldandnewtransmissionelectronmicroscope(TEM)techniquestobridgetheselengthscales.Usingatomic-resolutionimaging,wedeterminethelocationandidentityofeveryatomatagrainboundaryandfindthatdifferentgrainsstitchtogetherpredominantlyviapentago
7、n-heptagonpairs.Ratherthanindividuallyimagingtheseveralbillionatomsin14eachgrain,weusediffraction-filteredimagingtorapidlymapthelocation,orientation,andshapeofseveralhundredgrainsandboundaries,whereonlyahan
