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催化学报  2014 

Aselectivewaytocreatedefectsbythethermaltreatmentoffluorinateddoublewalledcarbonnanotubes

DOI: 10.1016/S1872-2067(14)60107-8, PP. 864-868

Keywords: Doublewalledcarbonnanotube,Fluorination,De-fluorination,Defectengineering,Ramanspectroscopy

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Abstract:

？Nanoscaledefectsintheoutertubetopreservetheelectricalandopticalfeaturesoftheinnertubecanbeengineeredtoexploittheintrinsicpropertiesofdoublewalledcarbonnanotubes(DWCNTs)forvariouspromisingapplications.WedemonstratedaselectivewaytomakedefectsintheoutertubebythefluorinationofDWCNTsfollowedbythethermaldetachmentoftheFatomsat1000℃inargon.FluorinatedDWCNTswithdifferentamountsofFatomswerepreparedbyreactingwithfluorinegasat25,200,and400℃thatgavethestoichiometryofCF0.20,CF0.30,andCF0.43,respectively.Atthethreedifferenttemperaturesused,weobservedpreservationofthecoaxialmorphologyinthefluorinatedDWCNTs.FortheDWCNTsfluorinatedat25and200℃,thestrongradialbreathingmodes(RBMs)oftheinnertubeandweakenedRBMsoftheoutertubeindicatedselectivefluorineattachmentontotheoutertube.However,thedisappearanceoftheRBMsintheRamanspectrumoftheDWCNTsfluorinatedat400℃showedtheintroductionofFatomsontobothinnerandoutertubes.TherewasnosignificantchangeinthemorphologyandopticalpropertieswhentheDWCNTsfluorinatedat25and200℃werethermallytreatedat1000℃inargon.However,inthecaseoftheDWCNTsfluorinatedat400℃,therecoveryofstrongRBMsfromtheinnertubeandweakenedRBMsfromtheoutertubeindicatedtheselectiveintroductionofsubstantialdefectsontheoutertubewhilepreservingtheoriginaltubularshape.ThethermaldetachmentofFatomsfromfluorinatedDWCNTsisanefficientwaytomakehighlydefectiveoutertubesforpreservingtheelectricalconductionandopticalactivityoftheinnertubes.

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