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1、NanoStmcturedMaterials,Vol.12,pp.79-82,1999ElsevierScienceLtdPergamon01999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved0965-9773199/$-w.frontmatterPI1SO9659773(99)00070-7NANOPARTICLEFORMATIONBYLASER-ASSISTEDPHOTOLYSISOFFERROCENE.K.Elihn,F.Otten,M.Fornan,F.E.Kruis,
2、H.Fissan,J.-O.Carlsson.InorganicChemistry,TheAngstromLaboratory,Box538,UppsalaUniversity,75121Uppsala,Sweden.ProcessandAerosolMeasurementTechnology,Gerhard-MercatorUniversity,Duisburg47057Duisburg,Germany.Abstract--Laser-assistedformationofiron-containingnanoparticleshasb
3、eenpegonnedbyphotolyticdissociationofferrocenevapourbyapulsedArFexcimerlaseratI93nm.Theprocesswascarriedoutatatmosphericpressure,eitherinaninertatmosphereofargonorinareactivegasmixtureofargonandoxygen.Differentialmobilityanalysers,DIVA’S,wereusedforthedeterminationofthepa
4、rticlesizes.Bychanginglaserparameterssuchasbeamsize,pulseenergyandrepetitionrate,particlesizesrangingfrom3to100nm,weregenerated.Morphologyandsizeofthenanoparticleswerestudiedviatransmissionelectronmicroscopy,TEM,andstructuralinformationwasobtainedfromelectrondijkction.Che
5、micalcompositionwasdeterminedthroughX-rayphotoelectronspectroscopy,XPS,andenergydispersiveX-rayspectroscopy,EDX.01999ActaMetallurgicaInc.INTRODUCTIONManyapproachesexistforthesynthesisofnanoparticles(l-3).Thedisadvantagewithmanyofthemistheirhighprocesstemperature,whichgive
6、sanincreasednumberofagglomeratedparticles.Toreducethenumberofagglomerates,alowerreactortemperatureisrequiredand/oralowerprimaryparticleconcentration.Ontheotherhand,bymaintainingalowparticleconcentration,onlyalimitedamountofnanoparticlescanbeproduced.Twotechniques,oneforge
7、neratingnanoparticlesandonefordeterminationofparticlesize,havebeencombinedinthispaper.Nanoparticlesweresynthesisedthroughthelaser-assistedphotolyticdissociationofferrocene,Fe(&H&.Themultiphotondissociationandionisationofferroceneintheuv/visrangehavebeenstudiedelsewhere(4,
8、5)anddissociationmechanismshavebeenproposed(6).Intheseexperimentsthedistributionofparticlesixesw
