Selective Chemical Modification of Graphene Surfaces

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1、SelectiveChemicalModificationofGrapheneSurfacesGraphenesurfacesSelectiveChemicalModificationofGrapheneSurfaces:DistinctionBetweenSingle-andBilayerGrapheneFabianM.Koehler,ArnhildJacobsen,KlausEnsslin,ChristophStampfer,andWendelinJ.Stark*Graphenemodificationswithoxygenorhydrogenarewellkn

2、owninKeywords:contrasttocarbonattachmenttothegraphenelattice.Thechemicalcovalentfunctionalizationmodificationofgraphenesheetswitharomaticdiazoniumions(carbonelectronicstructureattachment)isanalyzedbyconfocalRamanspectroscopy.Thetemporalmolecularelectronicsandspatialevolutionofsurf

3、ace-adsorbedspeciesallowsaccuratetrackingRamanspectroscopyofthechemicalreactionandidentificationofintermediates.Thecontrolledreactionmechanisms23transformationofsptospcarbonproceedsintwoseparatesteps.Thepresentedderivatizationisfasterforsingle-layergrapheneandallowscontrolledtransf

4、ormationofadsorbeddiazoniumreagentsintocovalentlyboundsurfacederivativeswithenhancedreactivityattheedgeofsingle-layergraphene.Onbilayergraphenethederivatizationproceedstoanadsorbedintermediate,whichreactsslowertoacovalentlyattachedspeciesonthecarbonsurface.21.Introductiontorehybridi

5、zationofthecarbonatomsfromansptoadistorted3[6]spstate,whichinducestheformationofabandgap.TheRecentlyithasbecomepossibletofabricatelargesingle-hydrogenationisreversiblethroughheatingandproceedsby[1,2]dehydrogenationofthegraphanetographene.Asanextensionlayergrapheneareas.Inordertocont

6、roltheelectronicpropertiesofthisfascinatingmaterialitisdesirabletoofthehydrogenationconcept(CþH¼CH),thecovalent[7,8]chemicallymodifygraphenesurfaces.Oneexampleistheattachmentofsmallorganicmoleculesenablesaccesstoa[3,4]libraryoffunctionalgroupsongraphenesurfaces.Suchoxidationtographe

7、neoxide,thatis,randomlyattachingoxygenspeciestothegraphenelatticebybreakingtheC
Cp-chemicalfunctionalizationmayeitherbeusedtochangethe[5]electronicpropertiesorthefunctionalgroupsandprovidesanands-bonds,resultinginabreakdownofconductivity.A[6]anchortosophisticatedorganicchemistry.[9]

8、Thiscouldallowmores