Electronic structure of graphite oxide and thermally reduced

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1、CARBON49(2011)1362–1366availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/carbonElectronicstructureofgraphiteoxideandthermallyreducedgraphiteoxideabc,daaaaDaZhan,ZhenhuaNi,WeiChen,LiSun,ZhiqiangLuo,LinfeiLai,TingYu,ca,*AndrewThyeShenWee,ZexiangShenaDivisionofPhysicsandAppl

2、iedPhysics,SchoolofPhysicalandMathematicalSciences,NanyangTechnologicalUniversity,Singapore637371,SingaporebDepartmentofPhysics,SoutheastUniversity,Nanjing211189,ChinacDepartmentofPhysics,FacultyofScience,NationalUniversityofSingapore,2ScienceDrive3,Singapore117542,SingaporedDepartmentofChemis

3、try,FacultyofScience,NationalUniversityofSingapore,3ScienceDrive3,Singapore117543,SingaporeARTICLEINFOABSTRACTArticlehistory:WepresenttheelectronicstructureevolutionfromgraphiteoxidetothermallyreducedReceived24August2010graphiteoxide.Mostfunctionalgroupswereremovedbythermalreductionasindicated

4、Accepted1December2010byhighresolutionX-rayphotoelectronspectroscopy,andtheelectricalconductivityAvailableonline4December2010increased6orderscomparewiththeprecursorgraphiteoxide.X-rayabsorptionspectros-copyrevealsthatthethermallyreducedgraphiteoxideshowsseveralabsorptionpeakssimilartothoseofpri

5、stinegraphite,whichwerenotobservedingraphiteoxideorchemi-callyreducedgraphiteoxide.Thisindicatesthebetterrestorationofgraphiticelectronicconjugationbythermalreduction.Furthermore,thesignificantincreasedintensityofRaman2Dbandofthermallyreducedgraphiteoxidecomparedwithgraphiteoxidealsosuggeststhe

6、restorationofgraphiticelectronicstructure(porbital).Theseresultsprovideusefulinformationforfundamentalunderstandingoftheelectronicstructureofgraphiteoxideandthermallyreducedgraphiteoxide.Ó2010ElsevierLtd.Allrightsreserved.1.Introductioncalapplications[7,10].Forexample,RGOfilmwasusedastransparen

7、tandconductiveelectrodesfordye-sensitizedso-Graphiteoxide(GO)isafunctionalgroupsrichcarbonaceouslarcell[8]andultra-capacitorapplications[11].layeredmaterial[1,2].Itisanon-stoichiometriccompoundAlthoughtherecentprogressonprocessingRGOfilm