不同形狀鉑納米粒子的合成及其SERS活性初步研究.pdf

1、廈門大學碩士學位論文不同形狀鉑納米粒子的合成及其SERS活性初步研究姓名：張勇申請學位級別：碩士專業(yè)：物理化學指導教師：田中群20051201AbstractMetalnanopartielesingeneralexhibitsomeuniqueelectric，magnetic，optical，calorificormechanicalproperties，whichareassociatedwiththeirsizeandshape

2、comparedwiththeirbulkmaterialsOneofthemostimportantissuesishowtosynthesizenanoparticleswithcontrollablesizeandshapeinordertostudyandutilizetheirspecialpropertiesSurfaceenhancedRamanscattering(SERS)effectisdeterminedbythe

3、opticalpropertyofnanoparticlesSERSinturnisapowerfultechniqueinstudyingtheopticalpropertiesofmetalnanoparticlesAccordingly，theSERSsubstrate，madeofsinglecrystalnanoparticles，maybeapromisingmaterialtobridgethegapbetweenrou曲

4、andsinglecrystalsurfaces，andhenceallowsUStoobtainadeepinsightintotheSERSmechanismInthiswork，wefirstsynthesizedplatinumnanoparticleswithcontrollablesizeandshapeTheSERSactivityofthesenanoparticleswasinvestigatedbyusingthio

5、cyanateion，carbonmonoxideandpyridineastheprobemoleculesThemainresultsaresummarizedasfollows：1，Platinumnanoparicles誦thdifferentshapeweresynthesizedbasedontheworkdevelopedbyElSayed’SgroupPlatinumnanoparicleswitlldifferents

6、hapehavebeenobtainedsuccessfullybycontrollingtheconcentrationratiobetweenK2PtCl4andpolyacrylateatroomtemperature，amongwhichnanocubeandnano—truncatedoctahedronareofmostinterestTheplatinumnanoparticlesweredispersedataglass

7、carbon(GC)electrodesurfacethencharacterizedbyelectrochemicalandSERStechniques2TheSERSactivityofthesenanoparficleswasinvestigatedindetailbyusingthiocyanateion，carbonmonoxideandpyridineastheprobemoleculesTheresultsillustra

8、tethattheSERSsignalsoftheadsorbedmoleculesOnplatinumnanopartMesarestrongerthanthatofthesameadsorbedmoleculesonroughedplatinumelectrodes，indicatingthattheplatinumnanoparticlesexhibitthehigherSERS—activityFurthermoretheSER

9、SsignalonplatinumnanocubesisstrongerthanthatofnanosphereandtruncatedoctahedralnanoparticlesThesurfaceenhancementfactorofpyridinefromplatinumnanocubesandtruncatedoctahedralplatinumnanoparticleswere402and206Thetheoreticala