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1、Chem.Mater.2010,22,6291–62966291DOI:10.1021/cm101996uOne-PotAqueousSynthesisofFeandAgCore/ShellNanoparticles§KylerJ.Carroll,DanielM.Hudgins,StevenSpurgeon,KennnethM.Kemner,§§BhoopeshMishra,MaximI.Boyanov,LesterW.BrownIII,MitraL.Taheri,and,EverettE.Car
2、penter*DepartmentofChemistry,VirginiaCommonwealthUniversity,Richmond,Virginia23284,UnitedStates,DepartmentofMaterialsScienceandEngineering,DrexelUniversity,Philadelphia,Pennsylvania19104,§UnitedStates,andBiosciencesDivisionArgonneNationalLaboratory,Ar
3、gonne,Illinois60439,UnitedStatesReceivedJuly18,2010.RevisedManuscriptReceivedOctober1,2010Thisarticleinvestigatesafacileone-potmethodforthesynthesisofFeandAgcore/shellnano-particlesbyaqueousreductionunderambientconditions.Wehaveshownthattheinjectionti
4、meofsilvernitrateintoareactionvesselcontainingaqueousferroussalt,sodiumborohydride,andsodiumcitrateisavitalparameterfortheprecisecontrolofadesiredcore/shellstructure.Forexample,ifsilvernitrateisinjectedoneminuteaftersodiumborohydrideisaddedtothereacti
5、onvessel,AgwillnucleatefirstfollowedbyFe,creatingmonodisperseAg/Fecore/shellnanoparticles.Incontrast,iftheintroductiontimeisprolongedto5min,FenanoparticleswillnucleatefollowedbyAgproducingFe/Agnanoparticles.Thecomposition,morphology,andmagneticbehavio
6、rwereinvestigatedbyX-rayabsorptionspectroscopy(XAS),X-rayphotoelectronspectroscopy(XPS),X-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),androom-temperaturevibratingsamplemagneto-metry(VSM).Fe/Agcore/shellnanoparticleswithopticalandmagneticfu
7、nctionalityofferbroadopportunitiesinmedicine,catalysis,andchemicaldetection.1.Introductionrangeofapplicationsfrommagneticseparatorstooptical8-11probesandrecoverablecatalysts.Bimetallicnanoparticleswithacore/shellmorphologySeveralmultistepsyntheticmeth
8、odshavebeenreportedtooffergreaterflexibilitywithenhancedpropertiesascom-preparebimetallicnanoparticles,includingchemicalreduc-paredtotheirmonometallicandbulkcounterparts.Thetion,microemulsiontechniques,sonochemicalreactions,fabricationofbimeta
