單分子及鹵素離子的光譜學特性研究.pdf

1、首都師范大學碩士學位論文單分子及鹵素離子的光譜學特性研究姓名：李會娟申請學位級別：碩士專業(yè)：材料物理與化學指導教師：方炎20080412Spectroscopicstudiesofsinglemolecuhandhalidestudlessinglemoleculesandhalidei‘onsAbstractSinglemoleculespectroscopywasappliedtothestudyofanimportantprobl

2、eminsurface—enhancedRamanscattering(SERS)Oneimportantconsequenceofthistypeofresearchis。explainingofadsorptionmechanism；then，thekeyimportantproblemisthatimproveenhanceofsubstrateinsingle—moleculeSeveralexperimentshaveshow

3、nthataddedhalideanionsintosilversolcandramaticallyaffecttheSERSintensityofdetectedsingle。moleculethispaperdiscussenhancesubstrateofsingle—moleculeintwoaspectsSERSisahighlysensitivetechniqueforprobingtheinterfacialphenome

4、naandthebehaviorofmoleculesadsorbedonmetalnanoparticlessurfaceItshowsfromtheexperimentsthatthevibrationalmodesofmoleculesweregreatlyincreased，especiallyappearedandevensplitaspredictionofelectromagneticenhancement(EM)theo

5、ryItmayprovideagoodreasonforUStobeoptimisticthatthetemplatesynthesiswillbeanadvantageoustooltofabricatethenewSERSactivesubstrateswhichappliedtothesinglemoleculefieldInrecentyears，observationofthesurfaceenhancedRamanscatt

6、ering(SERS)effectatthesurfacesofsilverparticleshavearousednewinterestinre—investigatingthecharacteristicsofsilvers01Furthermore，recentstudieshavedemonstratedthattheSERSenhancementfactorexcitedinthenearinfrared(NIR)region

7、isevenhigherthanthatinthevisiblerangeHowever，someexperimentsapprovedthattheobservationsofSERSandthesurfacesplasmonresonanceabsorption(SPA)bandchangedbyaddinghalideionsDifferentchemicalreductionmethodsandlaserablationmeth

8、odwereusedtoprepareAgnanoparticles，andbytransmissionelectronmicroscope(TEM)，RamandetectorUVVisabsorptionandfluorescencespectrometers，weanalyzedtheinfluencesofsize，shape，concentrationandaddedspeciestotheirabsorptions，lumi

9、nescenceandSERSsignalsTheinfluenceofaddinghalogenaniontothegraysilversolonlightabsorptionofthecolloidWasstudiedItwasfoundthatanewabsorptionbandappearedonthelongerwavelengthregionatabout1000nlnwiththeadditionofiontothemod

10、ifiedsilverparticles，andthattheoriginalsurfacesplasmonresonanceabsorptionbandwasreducedSynchronously，thelinearchainaggregationcausedbyaddingionleadstoanapparentblueshiftofthesurfacesplasmonresonanceabsorptionpeak，andthes