自组装单分子膜在金属电极上的表面增强拉曼光谱分析

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1、AbstractOrganisedmolecularassemblyhasbecomeoneofthemOstimportantareasofmodernchemicalresearch．ofthevarietyofapproachesusedfortheformationoforganizedmolecularassemblies，theselfassemblyistheoneforemostimponanttechnique．TheVefsatilityofselfassembledmonolayer(SAM)methodologytomakefhnctionalm

2、OnOlaversonmetalsurfhceshasattractedconsiderableattentionintherecentyears，whichcanimproVepotentialapplicationofsuchlayersincorrosionprotection，friction，optics，microelectronics，andchemicalsensors．TheextensionofappIicationofSAMscallsfbrthedeeperunderstandingofSAMswhichrequirest11eanalytica

3、lmethodswiththehighersensitivity．SurfaceenhancedRamanspectroscopy'whichhasbeenprovedtobeoneofthemostsensitivetoolstoinVestigateSAMs，canprovidemoredetailedinformationonthephysicochemicalpropertyofSAMswhilecombinedwithRamanmappingtechnique．Basedonthespectralfeaturealongwi也thecalculatedresu

4、ltsfromquantumchemistfy，wecandeducetheoriemationoftheadsorbedmolecukonmetalsurface．AndthestabilityofSAMsalsohasbeenexaminedbyinsituspectroelectrochemicalmethods．Furthermore，thedensityfhnctionaltheory(DFT)presentedinthethesisprovidesthefhndamentalunderstandingofthechemisorptionofthemolecu

5、leson901dandsilVersurfaceandthestructureofthemonlayersthusformed．Themaincontentsinthethesisarepresentedasfollows：(1)AcombinedprotocoloftheSERStechniquewithDFTcalculationhasbeenusedto100kintotheSAMsof6-mercaptopurineonsilversurface．And“wasfo'dndthattheadsorptionmodeof6MPSAMschangedw“hthep

6、Hvalueoftheenvironment．6MPwasadsorbedonthesilverelectrodewithatiltedorientationviaS，N1，andN7atomsinacidmedium，whiletheSAMsadoptedhead—OnadsorptionmodeswiththeSatomandtheNlatomanchoringthesilversurfaceinalkalinemedium．HoweVer，6MPSAMsturnstothesameuprightorientationontheelectrodethroughthe

7、SandN7atomswheneitheracidorbasicsolutionwasremoved．TheresunsreVealthedesorptionpotentialsof6MPSAMsunderacidandalkalineconditionsfromtheAgelectrodewereatca．一1．3Vand一1．6VvsSCE，respectively．Thedif话rentbehaViOrsof6MPSAMsongoldandsilversurfacealsowerecomparatiVelystudied(2)The