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1、NanoStmchuedMaterials,Vol.12,pp.11l-l14,1999ElsevierScienceLtdPergamon01999ActaMetallurgicaInc.PrintedintheUSA.Alltightsyeserved0965-9773/99/$-seefrontmatterPI1SO9659773(99)00076-sELECTRONMICROSCOPYOFNOBLEMETALALLOYNANOPARTICLESPREPAREDBYSONOCHEMICALMETHODSROshima,T.A.Yamamoto+,Y.Mi
2、zukoshi*,Y.NagataandY.Maeda*ResearchInstituteforAdvancedScienceandTechnology,OsakaPrefectureUniversity,Sakai,Osaka599-8570Japan+FacultyofEngineering,OsakaUniversity,Suita,Osaka565-0781,Japan”FacultyofEngineering,OsakaPrefectureUniversity,Sakai,Osaka599-8531,JapanAbstract-Argon-satur
3、atedaqueoussolutionsofNaAuC14andPdCI,orK2PtC14werereducedsimultaneouslybyultrasoundirradiationtopreparenoblemetalalloynanoparticles.Dropletsrecoveredfiiomcolloidaldispersionswereplacedoncarbon-supportedcoppergrids,anddriedinavacuum.TheywereexaminedbyTEM,HRTEM,andnano-areaenergydispe
4、rsionX-rayspectroscopy(EDX).TheAu-Pdnanoparticlesexhibitedmonodispersivedistribution(8nm),andconsistedofagoldcoreandapalladiumshell.Au-Ptalloynano-particlescouldnotbeproducedfromNaAuCldandK2PtC14aqueoussolutionseitherbysimultaneousorsuccessivereduction.01999ActaMetallurgicaInc.INTRO
5、DUCTIONTherehavebeennumerousreportsonphysicalandchemicaltechniquesforthepreparationofnanoparticles.Theevaporationofmetalelementsinaninertgasatmosphereisaconventionalphysicalmethodofpreparation.Ontheotherhand,asonochemicalmethodmayprovideanadvancedtechnique.Recently,theauthorshaverep
6、ortedthatAu,Pd.andPtnanoparticleshavebeensuccessfullyproducedbythereductionofaqueoussolutionswithmetalionsusingultrasoundirradiation(1,2).Inthepresentstudy.asonochemicalmethodhasbeendevelopedtopreparebinarynoblemetalalloynanoparticlesbythesimultaneousreductionofamixtureofaqueoussolu
7、tionswithvariousconcentrationsofAu,Pd,orPtmetalions.Thenanoparticlecharacterizationwascarriedoutbytransmissionelectronmicroscopy.EXPERIMENTALAqueoussolutionsofNaAuC&,PdCl;?andK2PtC14wereprepared.andmixedwithdesignatedconcentrations.Somesurfaceactiveagentsofsodiumdodecylsulfateorwate
8、rsolublepolymerwere
