Ag-Fe3O4 core shell

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1、ViewArticleOnline/JournalHomepage/TableofContentsforthisissueJournalofDynamicArticleLinksC

2、nDing,YanyanLiu,ShushengPan,YuanyuanLuoandGuanghaiLi*Received1stDecember2011,Accepted27thMarch2012DOI:10.1039/c2jm16293hAverysimpleprotocol,whichinvolvesthechemicalreductionofAgNO3andFe(NO3)3withethyleneglycolasreducingagent,hasbeendevelopedforsynthesizingAg@Fe3O4core/shellnanostru

3、cturesinwhichthesilvernanoparticlecorewascoveredbyathickerlayeroftheFe3O4nanoparticleshell.TheobtainedAg@Fe3O4core/shellnanostructuressimultaneouslypossessbothstrongmagneticresponsivenessandtunableplasmonicproperties.Theplasmonicpropertiesofthecompositenanospheresareprofoundlyinflue

4、ncedbythehighdielectricconstantoftheouterFe3O4shelllayerandcouldbeconvenientlymodulatedoverabroadspectralrangespanningfromtheultraviolettonear-infrared(NIR)regions(789nm)bysimplyalteringthethicknessoftheFe3O4shell.Thelocalizedsurfaceplasmonresonancesofthecore/shellnanocompositesred

5、-shiftedwithincreasingthicknessoftheFe3O4shell.ThemorphologytransformationoftheAg/Fe3O4nanocompositesfromcore/shellstructureswithacontinuousdensecoatingtoflower-likenanostructuresalsoallowsthetuningoftheirplasmonicpropertiestobeblue-shifted(to510nm).Catalyticdegradationofrhodamine6G

6、(R6G)experimentsshowthattheAg/Fe3O4compositenanostructuresexhibithighcatalyticactivitybysodiumborohydride.Duetotheefficientopticalresponsethroughlocalizedsurfaceplasmonresonances,thecatalyticperformancefromthesilvercoreandexternalmagneticmanipulationfromtheFe3O4shell,suchmultifuncti

7、onalnanoparticleswillprovideanopportunityforsimultaneousopticaldetectionandcatalyticreductionwiththeadditionalbenefitofrelativelyfacilerecoveryandregeneration.1.Introductionnanomaterialsholdsignificantpromiseforadiversenumberofapplications,e.g.electronic,opticalandmagneticdevices,Rec

8、ently,therehasbeenanincrea