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1、NanoStmchuedMaterials,Vol.12,pp.45-48,1999ElsevierScienceLtdPergamon81999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved0965-9113l99/$-seefrontmatterPI1SO9659773(99)00063-XSIZE-SELECTEDGOLDNANOPARTICLESBYAEROSOLTECHNOLOGYMartinH.Magnusson,KnutDeppert,Jan-OlleMal
2、ml,Jan-OlovBovinl,andLarsSamuelsonSolidStatePhysics,LundUniversity,Box118,22100Lund,Swedenl)InorganicChemistry2,LundUniversity,Box124,22100Lund,SwedenAbstract--Wehaveproducedsize-selectedgoldparticleswithsizesbelow30nmbymeansofaerosoltechnology.Themethodallowsforparti
3、clesofmanydifferentmaterialstobeproducedwithhighpurityandnarrowsizedistribution,anditallowseasytranportanddepositionoftheparticlesontoanysubstrate.Theparticlequalityhasbeeninvestigatedbytransmissionelectronmicroscopy,revealingahighdegreeofcrystallinity,especiallyafter
4、sinten’ngathightemperatures.01999ActaMetallurgicahc.INTRODUCTIONTheuseofverysmallparticlesasbuildingblocksinelectroniccircuitsandnanostructuredmaterialsdemandsthattheseparticlesbeproducedwithhighefficiencyandpurity.Formanyapplications,e.g.,whereCoulombblockadeorquantu
5、msizeeffectsarestudied,itisimportantthattheparticleshaveanarrowsizedistribution.Acommonmeansforproducingparticleswithanarrowsizedistributioniscolloidchemistry,whichcangivegoodresults.Aproblemwithcolloidsisthattheparticlesmustbecoatedwithasurfactantiftheyarenottocoales
6、ce,whichwillinevitablyintroducesomecontaminants.Also,wetchemicalmethodsare,ingeneral,lesscleanthangas-phasemethods,andusuallyinvolveproductioninbatches.Inourapproach,throughaerosoltechnology,theparticlesareproducedinacontinuousflow,’andinaverycleanenvironment.Themetho
7、disnaturallysuitedforlargescaleproduction.Wepresentacharacterizationofthemethoditself,andofthegoldparticlesproduced.EXPERIMENTALAschematicoftheaerosolfabricationapparatusisshowninfig.1;itissimilartotheonepreviouslyusedtoproducenanoparticlesofAg(1).Itworksasfollows:Ace
8、ramicboatcontaininghighpuritygold(99.9999%)isplacedinsideatubefurnace,whichisheatedto1650OC,creatingagoldvapor.Throughthefur
