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1、NanoStmchuedMaterials,Vol.12,pp.83-88,1999ElsevierScienceLtdPergamonQ1999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved0965-9773/99/$-seefrontmatterPI1SO9659773(99)00071-9TEMPLATESYNTHESISOFCARBONNANOTUBESG.L.Hornyak’,A.C.Dillon’,P.A.Parilla’,J.J.Schneider’,N
2、.Czap2,K.M.Jones’,F.S.Fasoon’,A.MasonI,andM.J.Heben’’NationalRenewableEnergyLaboratory1617ColeBlvd.,Golden,Colorado80401USA’InstitutfurAnorganischeChemie,UniversitatEssen,45117Essen,GermanyAbstract--Thetemplatesynthesisandcharacterizationofcarbonnanotubes(CNTs)forme
3、dinporousaluminamembranes(PAM)bythethermalchemicalvapordecomposition(CVD)ofpropylene(Pr)gasaredescribedWefoundthatthegraphiticcharacterofCNTsimprovedasCVDtemperaturewasincreasedfrom500to800“C.Samplesshowedprogressiveincreasesinmetallicappearanceana’layeredtubewallst
4、ructureanddecreasesinelectricalresistance.Nofurtherenhancementofgraphitizationwasobservedamongsamplesformedat800,900and1000°C.X-raydiffraction(XRD)indicatedthatlong-rangeorderwasabsentinallCNTstested.Localizedcrystallinedomainsofgraphiticcarbon,however,weredetectedb
5、yRamanspectroscopyandseeninlightanddarkfieldtransmissionelectronmicroscopy(TEM)images.CNTsformedinthepresenceofcatalyticFeandCoparticlesat600and700“CwithaPr/N,flowrateof94seem(standardcubiccentimetersperminute)showedslightlylowerelectricalresistancethanCNTsformedinc
6、ontrolexperiments.ThecatalyticeffectsofFeandCowereobservedforsamplesmadeat800“Cwitha50seemP/N2flowrateas“nanotubeswithinnanotubes”wereformed.Nomajordtrerenceswerefoundbetweencatalyst-containingandcontrolsamplesformedattemperaturesgreaterthanorequalto800“Cat94seem.01
7、999ActaMetallurgicainc.INTRODUCTIONSingle-wallCNTsformedbyanarc-dischargeprocesswereshownhereatNRELtostabilizeadsorbedhydrogenatmoderatetemperatures(1)andtodemonstrateselectivityofCO,overCH,ingasseparationexperiments(2).StudyoftransportandadsorptionpropertiesofCNTsw
8、ouldbegreatlyfacilitated,however,ifnanotubescouldbealignedwithinawell-definedmatrix.PAMs,formedbytheanodicelectrolysisofaluminum,consistof
