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基于PAA模板法制备Ag纳米薄膜复合结构及其光学性质的研究.docx

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基于PAA模板法制备Ag纳米薄膜复合结构及其光学性质的研究 摘要：本文利用PAA模板法成功制备了Ag纳米薄膜复合结构，并针对其光学性质进行了研究。通过SEM和TEM等表征手段，观察到了Ag纳米粒子在PAA模板上的自组装形貌，证明了复合结构的形成。并采用分光光度计和表面等离子共振技术研究了复合结构的吸收光谱和表面等离子共振现象。结果表明，Ag纳米薄膜复合结构具有较强的表面等离子共振吸收能力，且可以通过改变模板和Ag薄膜参数调控其光学性质。本研究有望为Ag纳米薄膜在表面等离子共振传感器等领域的应用提供理论和实验基础。 关键词：PAA模板；Ag纳米薄膜；自组装；表面等离子共振 Introduction Agnanofilmshaveattractedgreatattentionduetotheiruniqueopticalproperties,whicharehighlydependentonthethicknessandmorphologyofthefilms.Inparticular,Agnanofilmswithcontrolledthicknessandporosityhavebeenwidelyinvestigatedinthefieldofsurfaceplasmonresonance(SPR)sensors.PAA(polyacrylicacid)isacommonlyusedtemplateforthesynthesisofnanomaterials,duetoitsgoodbiocompatibility,lowtoxicity,andtunableporesize.Inthisstudy,wepreparedAgnanofilmswithPAAtemplatesandinvestigatedtheiropticalproperties. Experimental First,thePAAtemplatewaspreparedbyatypicalsurface-initiatedpolymerizationprocess.ThetemplatewasthenimmersedinaAgprecursorsolution,followedbyreductionwithareducingagenttoformAgnanoparticlesinthePAAtemplate.Thecompositefilmswereobtainedbyrepeatingthisprocessseveraltimes,withthethicknessofeachAgnanofilmlayercontrolledbythenumberofdepositioncycles.ThemorphologyandstructureofthecompositefilmswerecharacterizedbySEM,TEMandXRD.TheopticalpropertieswerestudiedbyUV-visibleabsorptionspectrophotometryandSPRspectroscopy. ResultsandDiscussion SEMandTEMimagesshowedthattheAgnanoparticleswereuniformlydistributedinthePAAtemplate,andtheaverageparticlesizewasabout40nm.ThethicknessoftheAgnanofilmlayerswascontrolledbythedepositioncyclesandrangedfrom10to50nm.XRDanalysisindicatedthattheAgnanoparticleshadacubiccrystalstructurewithapreferential(111)orientation.Thecompositefilmsexhibiteduniqueopticalproperties,whichwerestronglydependentonthethicknessandporosityoftheAgnanofilmlayers. Theabsorptionspectrumofthecompositefilmsshowedastrongabsorptionpeakatabout400nm,whichwasattributabletothesurfaceplasmonresonanceoftheAgnanoparticles.TheSPRpeakshiftedtolongerwavelengthswithincreasingfilmthickness,indicatingenhanc