nl-Using Binary Surfactant Mixtures To Simultaneously Improve the

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1、Letterpubs.acs.org/NanoLettUsingBinarySurfactantMixturesToSimultaneouslyImprovetheDimensionalTunabilityandMonodispersityintheSeededGrowthofGoldNanorods†,§‡,§†‡,†,‡XingchenYe,ChenZheng,JunChen,YuzhiGao,andChristopherB.Murray*†‡DepartmentofChemistryandDepartmentofMaterialsScienceandEngineering,

2、UniversityofPennsylvania,Pennsylvania19104,UnitedStates*SSupportingInformationABSTRACT:Wereportadramaticallyimprovedsynthesisofcolloidalgoldnanorods(NRs)usingabinarysurfactantmixturecomposedofhexadecyltrimethylammoniumbromide(CTAB)andsodiumoleate(NaOL).Boththin(diameter<25nm)andthicker(diamet

3、er>30nm)goldNRswithexceptionalmonodispersityandbroadlytunablelongitudinalsurfaceplasmonresonancecanbesynthesizedusingseededgrowthatreducedCTABconcentrations(aslowas0.037M).TheCTAB−NaOLbinarysurfactantmixtureovercomesthedifficultyofgrowinguniformthickgoldNRsoftenassociatedwiththesingle-component

4、CTABsystemandgreatlyexpandsthedimensionsofgoldNRsthatareaccessiblethroughaone-potseededgrowthprocess.GoldNRswithlargeoveralldimensionsandthushighscattering/absorptionratiosareidealforscattering-basedapplicationssuchasbiolabelingaswellastheenhancementofopticalprocesses.KEYWORDS:Goldnanorods,CT

5、AB,sodiumoleate,surfactantmixture,tetrahexahedral,plasmonics2,20−30oldnanorods(NRs)havereceivedsignificantattentionincontinuouslyoptimizedbymanyresearchgroups.AG171727recentyearsbecauseofgreatpromiseforawidearrayofvarietyofadditivessuchasacetone,cyclohexane,Na2S,applicationsincludingplasmon-en

6、hancedspectroscopies,1,226,31,3233−35hydrochloricacidornitricacid,iodideandbromidebioimagingandtherapeutics,3−5chemicalsensing,6,7photonicions,36−38copperions,39andsmallaromaticmolecules40have8andoptoelectronicdevices,andsoforth.TheresonantbeenintroducedtothegrowthsolutiontoaffectgoldNRexcitat

7、ionofthecollectiveoscillationsoffreeelectronsconfinedgrowth.Importantly,El-SayedandNikoobakhtdemonstratedtotheNRsleadstothecreationoflocalizedsurfaceplasmonthatNRsgrowninabinarysurfactantmixtureofCTABandresonancesandlargeelectricfieldenhancemen