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1、NANOLETTERSSelectiveCoatingofSingleWallCarbon2002Vol.2,No.4NanotubeswithThinSiO2Layer329-332QiangFu,ChenguangLu,andJieLiu*GrossChemistryLaboratory,DukeUniVersity,Box90354,Durham,NorthCarolina27708ReceivedJanuary27,2002;RevisedManuscriptReceivedFebruary19,2002ABSTR
2、ACTSinglewalledcarbonnanotubes(SWNTs)havebeenshowntobehighlysensitivegassensors.However,attachingfunctionalgroupswithselectivesensingfunctionsonnanotubeswithoutdestroyingtheintrinsicelectronicpropertyofthenanotubesisstillchallenging.Here,wereportanewmethodofcoatin
3、gSWNTswithathinlayerofSiO2using3-aminopropyltriethoxyysilaneascouplinglayers.ThethicknessoftheSiO2couldbecontrolledatabout1nm.ThecoatingofSiO2onSWNTswasconfirmedbyburningtheSWNTsinair.Theeffectof3-aminopropyltriethoxyysilanewasalsodiscussed.Carbonnanotubeshavebeen
4、themostactivelystudiedpingandcoatingbypolymersandsurfactantswerere-materialsinthepastfewyearsduetotheiruniqueelectronicported.13-15Morerecently,coatingwiththicklayerofSiO2andmechanicalproperties.1,2CarbonnanotubescanbeeitheronMWNTsforcompositeapplicationshavebeenr
5、eported.12metallicorsemiconductive,dependingontheirhelicityandHowever,sofar,thereisnoflexiblemethodthatcoulddiameter.Moreimportantly,itwasobservedthatthefunctionalizeSWNTswithabroadvarietyoffunctionalities.electronicpropertiesofnanotubes,especiallysemiconductingHe
6、re,wereportanewmethodtoselectivelyfunctionalizecarbonnanotubes,areverysensitivetothesurroundingSWNTssidewallswithathinlayerofSiO2,whichcouldenvironments.Thepresenceofoxygen,NH3andmanyotherofferflexiblewaysforfurthermodificationbyutilizingthemoleculesthatcaneitherd
7、onateorremoveelectronsfromrichchemistryavailableforsilicasurface.Ourapproachthenanotubescansignificantlyaltertheoverallconductivityinvolvestheuseofapromoter,3-aminopropyltriethanox-ofthenanotubes.3-5Suchpropertiesmakecarbonnanotubesysilane(APTES),whichcouldbeabsor
8、bedonthesidewallsidealcandidatesfornanoscalesensingmaterials.Actually,ofSWNTbytheinteractionbetweenaminegroupsanditwasreportedthatnanotubesFETscanfuncti
