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1、NaaoStructuredMaterials,Vol.12,pp.61-64,1999ElsevierScienceLtdPergamon01999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved096%9113/99/$-seefrontmatterPI1SO9659773(99)00066-5PREPARATIONANDCHARACTERIZATIONOFCOBALTOXIDENANOSIZEDPARTICLESOBTAINEDBYANELECTROCHEMICALMETHODE.P.Reddy’,T.C.Rojas
2、’,J.C.Sanchez-Lopez’,M.Dominguez3,E.Roldan’,J.Campora*,P.Palma*,A.Femandez’’InstitutodeCienciadeMaterialesdeSevillaandDpto.QuimicaInorganica.*InstitutodeInvestigacionesQuimicasandDpto.QuimicaInorganica.CentrodeInvestigacionesCientificasIsladelaCartuja.Avda.AmericoVespuccios/n,41092-Sevilla,Sp
3、ain.3Dpto.deQuimica-Fisica,UniversidaddeSevilla,Ckof.GarciaGonzalezs/n,41012-Sevilla.Abstract-Anelectrochemicalprocesshasbeendescribedbywhichmetalfoilsareanodicallydissolvedandthemetalsaltsformedasintermediatesarecathodicallyreducedwith,formationqfmetalclustersstabilizedbytetraalkylammoniumsa
4、lts.Theelectrolysisprocesshasbeeninvestigatedbycyclicvoltammetryshowingtheformationofreducedcobaltadatoms.followedbyclusterformation.InthepresentpaperwehavestudiedsuchprocessforthepreparationofnanosizedCoclustersandtheirulterioroxidationtocobaltoxidenanosizedparticlesstableinair.TheTEA4analys
5、isshowstheformationofhomogeneousparticles(2-4nmindiameter)embeddedinasurfactantprotectivematrix.ElectrondtfiactionshowsbroadbutclearpeakscorrespondingtotheformationofverysmallCo0crystallites.X-RayAbsorption(XAS),ElectronEnergyLoss(EELS)andX-RayPhotoelectron(XPS)spectroscopieshavebeenusedtocha
6、racterizethematerialsshowingthestabilizationofsmallcobaltoxideclusters.@I999ActaMetallurgicaInc.I.INTRODUCTIONThestudyofmagneticpropertiesoftineparticleswastraditionallyurgedbybothatechnologicalandtheoreticalinterestconnectedwiththepossibilitytodevelopabetterunderstandingofmagneticphenomenare
7、latedtosizeeffects.Innovativenanostructuredsystemswithexcellentsoftandhardmagneticproperties(1,2)havebeendeveloped,whichatpresentplayanimportantroleinmodemtechnologyandresearch.Inparticular,thepreparationandcharacterizationofnanometricparticl
