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1、物理化学学报(WuliHuaxueXuebao)AprilActaPhys.-Chim.Sin.,2010,26(4)：1177-11831177[Article]www.whxb.pku.edu.cn用双还原法制备三角形银纳米片及其光学性能1,2111,*赖文忠赵威杨容李星国(1北京大学化学与分子工程学院,稀土材料化学及应用国家重点实验室,北京分子科学国家实验室,北京100871;2三明学院化学与生物工程系,福建三明365004)摘要：在硼氢化钠和柠檬酸三钠共存的体系中还原硝酸银,以聚乙烯吡咯烷酮(
2、PVP)为表面活性剂和保护剂,水浴加热制备得到三角形银纳米片,用X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见(UV-Vis)吸收光谱、表面增强拉曼散射(SERS)光谱对其进行了表征.结果表明:三角形银纳米片产物为立方相金属银,边长为(100±40)nm,厚度为(10±5)nm;产物表现出与球形银纳米粒子完全不同的吸收光谱;柠檬酸根在银晶核不同晶面的选择吸附、PVP的包覆作用及Ag(111)晶面的层错对产物的形成起决定作用;与球形纳米颗粒相比,三角形银纳米片膜对吡啶(Py)分子有显著的SE
3、RS活性.关键词：双还原法;三角形银纳米片;生长机理;表面等离子共振;表面增强拉曼散射光谱中图分类号：O647;TG146.32PreparationandOpticalPropertiesofTriangularSilverNanoplatesbyaDual-ReductionMethod1,2111,*LAIWen-ZhongZHAOWeiYANGRongLIXing-Guo(1BeijingNationalLaboratoryforMolecularSciences,StateKeyLabora
4、toryofRareEarthMaterialsChemistryandApplications,CollegeofChemistryandMolecularEngineering,PekingUniversity,Beijing100871,P.R.China;2DepartmentofChemistryandBiologyEngineering,SanmingUniversity,Sanming365004,FujianProvince,P.R.China)Abstract：Triangulars
5、ilvernanoplatesweresuccessfullypreparedbyawater-bathheatingmethod.NaBH4andsodiumcitratewerebothusedasreducingagentswhilepolyvinylpyrrolidone(PVP)wasusedasasurfactantandprotectiveagent.TheproductwascharacterizedbyX-raydiffraction(XRD),transmissionelectro
6、nmicroscopy(TEM),UV-Visabsorptionspectroscopy,andsurface-enhancedRamanscattering(SERS)spectrum.Theproducthasacubicface-centeredAgstructure.Thetriangularsilvernanoplateshaveabordersizeof(100±40)nmandathicknessof(10±5)nm.Agrowthmechanismisproposedtoaccoun
7、tfortheformationoftriangularnanoplates.Thepreferentialabsorptionofcitrateondifferentcrystalplanesofsilvernuclei,theencapsulationfunctionofPVPandtheexistenceoflatticedefectsinsilvercrystalsplaysasignificantroleintheformationofproducts.Comparedwithspheric
8、alnanoparticles,thetriangularsilvernanoplatesexhibitadifferentabsorptionspectrumandstrongSERSactivityforpyridine(Py)molecules.KeyWords：Dual-reductionmethod;Triangularsilvernanoplates;Growthmechanism;Surfaceplasmonresonance;Surfac
