资源描述：
《Uniform Silver Nanowires Synthesis by Reducing AgNO3 with Ethylene Glycol in the Presence of Seeds and Poly(Vinyl Pyrrolidone)》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、4736Chem.Mater.2002,14,4736-4745UniformSilverNanowiresSynthesisbyReducingAgNO3withEthyleneGlycolinthePresenceofSeedsandPoly(VinylPyrrolidone)YugangSun,²YadongYin,³BrianT.Mayers,²ThurstonHerricks,³andYounanXia*,²DepartmentofChemistryandDepartmentofMate
2、rialsScienceandEngineering,UniversityofWashington,Seattle,Washington98195ReceivedMay17,2002.RevisedManuscriptReceivedAugust29,2002Asolution-phaseapproachhasbeendemonstratedforthelarge-scalesynthesisofsilvernanowireswithdiametersintherangeof30-40nm,and
3、lengthsupto50ím.ThefirststepofthisprocessinvolvedtheformationofPt(orAg)nanoparticlesbyreducingPtCl2(orAgNO3)withethyleneglycol(EG)heatedto160°C.ThesePt(orAg)nanoparticlescouldserveasseedsfortheheterogeneousnucleationandgrowthofsilver(formedbyreducin
4、gAgNO3withEG)becauseoftheirclosematchincrystalstructureandlatticeconstants.Inthepresenceofpoly(vinylpyrrolidone)(PVP),thegrowthofsilvercouldbedirectedintoahighlyanisotropicmodetoformuniformnanowireswithaspectratiosashighas1000.UV-visiblespectroscopy,
5、SEM,TEM,XRD,andelectrondiffractionwereusedtocharacterizethesesilvernanowires,indicatingtheformationofahighlypurephase,aswellasauniformdiameterandbicrystallinestructure.Bothmorphologyandaspectratiosofthesesilvernanostructurescouldbevariedfromnanopartic
6、lesandnanorodstolongnanowiresbyadjustingthereactionconditions,includingtheratioofPVPtosilvernitrate,reactiontemperature,andseedingconditions.Measurementsofthetransportpropertiesatroomtemperatureindicatedthatthesesilvernanowireswereelectricallycontinuo
7、uswithaconductivity(0.8105S/cm)approachingthatofbulksilver.Introductioncomponentsinfabricatingnanoscaledevices.5MetallicnanowiresmayalsoprovideauniquemodelsystemtoOne-dimensional(1D)nanostructures(wires,rods,experimentallyprobephysicalphenomenasucha
8、sandtubes)areexpectedtoplayanimportantroleinquantizedconductanceandlocalizationeffects.6fabricatingnanoscaledevices.Therearemanyapplica-Silvernanowireswithwell-defineddimensionsrep-tionswherenanowirescouldbeexploitedtogreatlyresentaparticularc
