[Carbon]Synthesis of graphene-based nanosheets via chemical reduction.pdf

[Carbon]Synthesis of graphene-based nanosheets via chemical reduction.pdf

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1、Carbon45(2007)1558–1565www.elsevier.com/locate/carbonSynthesisofgraphene-basednanosheetsviachemicalreductionofexfoliatedgraphiteoxideaaaaSashaStankovich,DmitriyA.Dikin,RichardD.Piner,KevinA.Kohlhaas,cccAlfredKleinhammes,YuanyuanJia,YueWu,b,*a,*SonBinhT.Nguyen,RodneyS.Ruo?aDepartmentofMechanica

2、lEngineering,NorthwesternUniversity,2145SheridanRd.,Evanston,IL60208-3133,USAbDepartmentofChemistry,2145SheridanRd.,Evanston,IL60208-3113,USAcDepartmentofPhysicsandAstronomyandCurriculuminAppliedandMaterialsSciences,UniversityofNorthCarolina,ChapelHill,NC,27599-3255,USAReceived17January2007;ac

3、cepted19February2007Availableonline6March2007AbstractReductionofacolloidalsuspensionofexfoliatedgrapheneoxidesheetsinwaterwithhydrazinehydrateresultsintheiraggregationandsubsequentformationofahigh-surface-areacarbonmaterialwhichconsistsofthingraphene-basedsheets.Thereducedmaterialwascharacteri

4、zedbyelementalanalysis,thermo-gravimetricanalysis,scanningelectronmicroscopy,X-rayphotoelectronspectroscopy,NMRspectroscopy,Ramanspectroscopy,andbyelectricalconductivitymeasurements.ó2007ElsevierLtd.Allrightsreserved.1.Introductionlets/nanoplateletsfromtheexpandedmaterial(ballmillingorexposure

5、toultrasound)hasbeenrecentlydemonstratedGraphite-likenanoplateletshaverecentlyattracted[6–13].Althoughthissimplemethodhasbeenappliedattentionasaviableandinexpensive?llerincompositeonalargescaletocommerciallyavailablesulfuricacid-materials[1–3]thatcanbeusedinmanyengineeringappli-intercalatedgra

6、phite,itneverresultsincompleteexfoliationcations,giventheexcellentin-planemechanical,structural,ofgraphitetothelevelofindividualgraphenesheets.Thethermal,andelectricalpropertiesofgraphite[4].Theseextentofthermalexpansion(andthereforetheplateletexcellentpropertiesmayberelevantatthenanoscaleifth

7、ickness)isdependentonthetypeofgraphiteusedandgraphitecanbeexfoliatedintothinnanoplatelets,andevenontheintercalationprocedure[14,15].Withfewexceptionsdowntothesinglegraphenesheetlevel[5].[3],thegraphitenanoplateletsobtainedviathisprocess

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