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20046218,1771～1774ACTACHIMICASINICAVol.62,2004No.18,1771～1774邹 凯a,b 张晓宏,a 吴世康,a 段晓峰b(a 100101)(b 100080) ,(PVP)50～120nm,50μm.、.. ,,UV,,PVPSynthesisofSilverNanowiresbythePhotochemicalMethodandTheirFormationMechanismZOU,Kaia,b ZHANG,Xiao-Hong,a WU,Shi-Kang,a DUAN,Xiao-Fengb(aTechnicalInstituteofPhysicsandChemistry,ChineseAcademyofSciences,Beijing100101)(bBeijingLaboratoryofElectronMicroscopy,InstituteofPhysics,ChineseAcademyofSciences,Beijing100080)Abstract Usingseed-mediatedandphotochemicalreductionapproachinthepresenceofpoly(vinylpyrrolidone)(PVP),Agnanowireswithdiametersof50～120nmandlengthsupto～50μmandelegantsilverdendriteswerepreparedatroomtemperature.ItwasfoundthatexperimentalconditionsincludingthemolarratioofPVPtoAgNO3,thevolumeofsilverseeds,andthereactiontimeallplayinfluentialrolesintheformationofsilvernanostructures.Themechanismsofformationofthosesilvernanostructureswerediscussedpreliminarily.Keywords silvernanowire,silvernanodendrite,UVirradiation,seed-mediated,PVP 、...:(AAO)(PC)[1],[2][3].,,..Xia[4](PVP),.Murphy[5],,-.,(PVP),,,,,.1 1.1 PhillipsCM12,GATANPhillipsFEG-CM200.(PVP)(Mw=58000)Aldrich;AgNO3,NaBH4()..E-mail:shikangwu@yahoo.com;zhangxh8@yahoo.comReceivedDecember24,2003;revisedMarch16,2004;acceptedMay21,2004.973(No.2001CB610502).1.2 :10mL0.5mmol/LAgNO310mL0.5mmol/L,,0.6mL10mmol/LNaBH4,30s.,(4±2)nm.:0.1mL()3mL1mmol/L2mmol/L(Mw=58000)(PVP),15W(λ=253.7nm)48h.6000r/min20min,,.2 2.1 ,.(PVP/AgNO3),,PVP/AgNO310,60nm,.,,.PVP/AgNO30.8,.1(A)1mmol/L2mmol/L48h.,80～100nm,35μm.1(B)(HRTEM),(111),0.235nm,(111)(0.234nm).EDS[1(C)]().,.,:,、.,,,.,,,[6].0.5mL,,1(D).Zhou[7].1 (A)3mL1mmol/LAgNO32mmol/L(Mw=58000)0.1mL48h;(B);(C)EDS;(D)0.5mLFigure1 (A)TEMimageofsilvernanowiresobtainedbyUVirradiationin3mLofaqueoussolutionof1mmol/LAgNO3,2mmol/Lpoly(vinylpyrrolidone)(Mw=58000)and0.1mLofsilverseedsfor48h;(B)HREMimageofas-preparedsilvernanowire;(C)EDSoftheproducedsilvernanowires;(D)TEMimageofsilvernanostructuresobtainedwhen0.5mLofsilverseedswereadded1772 Vol.62,20042.2 .72h,.,[8].,.[6][4],,,,,.:,.,10h,,2(A),,—NH—COAg,(),.30h“”,2(B).,,.[2(B)][2(C)],,“”.,,,、、.,.2(D)48h,.2(E),2(F)N,2(F)N,,.3 .,,.2 (A)10h;(B)30h;(C)2(B);(D)48h;(E)(F)NFigure2 (A)Bright-fieldTEMimageoftheproductobtainedafter10h;(B)TEMimageoftheproductobtainedafter30h;(C)EnlargedpictureofarrowpositioninFigure2(B);(D)Bright-fieldTEMimageofproductobtainedafter48h;(E)TEMimageofsilvernanowireand(F)thecorrespondingNelementmap1773No.18 :“”References1(a)Sauer,G.;Brehm,G.;Schneider,S.;Nielsch,K.;Wehrspohn,R.B.;Choi,J.;Hofmeister,H.;Gösele,U.J.Appl.Phys.2002,91,324.(b)Barbic,M.;Mock,J.J.;Smith,D.R.;Schultz,S.J.Appl.Phys.2002,91,9341.2Huang,M.H.;Choudrey,A.;Yang,P.Chem.Commun.2000,1063.3Sloan,J.;Wright,D.M.;Woo,H.-G.;Bailey,S.;Brown,G.;York,A.P.E.;Coleman,K.S.;Hutchison,J.L.;Green,M.L.H.Chem.Commun.1999,699.4(a)Sun,Y.;Gates,B.;Mayers,B.;Xia,Y.NanoLett.2002,2,165.(b)Sun,Y.;Xia,Y.Adv.Mater.2002,14,833.(c)Sun,Y.;Yin,Y.;Mayers,B.T.;Herricks,T.;Xia,Y.Chem.Mater.2002,14,4736.5Jana,N.R.;Gearheart,L.;Murphy,C.J.Chem.Commun.2001,617.6Huang,H.H.;Ni,X.P.;Loy,G.L.;Chew,C.H.;Tan,K.L.;Loh,F.C.;Deng,J.F.;Xu,G.Q.Langmuir1996,12,909.7Zhou,Y.;Yu,S.H.;Wang,C.Y.;Li,X.G.;Zhu,Y.R.;Chen,Z.Y.Adv.Mater.1999,11,850.8(a)Kim,F.;Song,J.H.;Yang,P.J.Am.Chem.Soc.2002,124,14316.(b)Kamat,P.V.J.Phys.Chem.B2002,106,7729.(A0312241 SONG,J.P.;DONG,H.Z.)1774 Vol.62,2004