3DGraphene-NatureMaterials.PDF

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1、LETTERSPUBLISHEDONLINE:10APRIL2011

2、DOI:10.1038/NMAT3001Three-dimensionalflexibleandconductiveinterconnectedgraphenenetworksgrownbychemicalvapourdepositionZongpingChen(,WencaiRen(,LiboGao,BiluLiu,SongfengPeiandHui-MingCheng*Integrationofindividualtwo-dimensionalgraphenesheets1–3grap

3、henesheetsintroducedduringexfoliationandreductionintomacroscopicstructuresisessentialfortheapplicationprocessesand/orhighinter-sheetjunctioncontactresistance.ofgraphene.Aseriesofgraphene-basedcomposites4–6andRecently,large-areahigh-qualitygraphenefilmshavebeengrownmacroscopicstruc

4、tures7–11havebeenrecentlyfabricatedusingbyCVDandtransferredformacroscopicuseastransparentchemicallyderivedgraphenesheets.However,thesecompos-conductivefilms24,26,whicharefarsuperiortothosefabricateditesandstructuressufferfrompoorelectricalconductivityusingchemicallyderivedgraphene

5、sheets.However,bothlarge-becauseofthelowqualityand/orhighinter-sheetjunctionquantitysynthesisofCVD-growngrapheneandintegrationintocontactresistanceofthechemicallyderivedgraphenesheets.3Dstructuresstillremainagreatchallenge.Herewereportthedirectsynthesisofthree-dimensionalInthiswor

6、k,wedevelopageneralstrategyforthesynthesisoffoam-likegraphenemacrostructures,whichwecallgraphenea3Dgraphenemacroscopicstructurewithafoam-likenetworkfoams(GFs),bytemplate-directedchemicalvapourdeposi-graphenefoam(GF),usingtemplate-directedCVD.Differentfromtion.AGFconsistsofaninter

7、connectedflexiblenetworkstructuresformedwithsmallpiecesofchemicallyderivedgrapheneofgrapheneasthefasttransportchannelofchargecarri-sheets,theGFfabricatedbyourapproachisamonolithofaersforhighelectricalconductivity.EvenwithaGFloadinggraphene3Dnetwork,inwhichchargecarrierscanmoverapid

8、lyaslowas0:5wt%,GF/poly(dimethylsiloxane)compositeswithasmallresistancethroughthehigh-qualityandcontinuousshowaveryhighelectricalconductivityof10Scm1,whichCVD-growngraphenebuildingblocks.Therefore,weexpecttois6ordersofmagnitudehigherthanchemicallyderivedobserveextraordinaryele

9、ctricalandmechanicalpropertiesofG