Morphology_Control_of_Metal_Oxide_Nanocrystals

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1、1MorphologyControlofMetalOxideNanocrystalsYoshitakeMasudaNationalInstituteofAdvancedIndustrialScienceandTechnology(AIST)Anagahora,Shimoshidami,Moriyama-ku,NagoyaJapan1.IntroductionMetaloxideshavebeenwidelyusedinelectrodevices,opticaldevices,etc.Recently,li

2、quidphasesynthesesofthemattractmuchattentionasfuturetechnologyandnovelacademicfield.Especially,liquidphasesynthesesofanisotropicparticlesorfilmsareexpectedfornextgenerationmetaloxidedevices.Thissectiondescribesliquidphasemorphologycontrolofanisotropicmetal

3、oxide.Theywererealizedbyprecisecontrolofnucleationandcrystalgrowth.Theyshowedhighperformanceofsolutionsystemsforfuturemetaloxidedevices.Liquidphasemorphologycontrolofanisotropicmetaloxideparticlesandfilmswouldcontributetodevelopmentofmetaloxidescienceandte

4、chnology.12.MorphologycontrolofacicularBaTiO3particlesAcicularBaTiO3particlesweredevelopedusingsolutionsystems.ThemorphologyofBaC2O40.5H2Owascontrolledtoacicularshape.ItsphasetransitiontoBaTiO3wasrealizedbyintroducingTiionsfromthecoprecipitatedamorphouspha

5、se.AcicularBaTiO3particleshaveanaspectratioashighas18andtheparticlesizecanbecontrolledbyvaryingthegrowthperiodofBaC2O4·0.5H2OwhichgovernsthesizeofBaC2O4·0.5H2Oparticles.AcicularparticlesofcrystallineBaTiO3canbeusedforultra-thinmultilayerceramiccapacitors.M

6、ultilayerceramiccapacitors(MLCC)areindispensableelectroniccomponentsforadvancedelectronictechnology2-12,butlargercapacityandsmallersizeareneededforfutureelectronicdevices.Tomeettheseneeds,BaTiO3particlesweredownsized,butferroelectricceramicslosetheirferroe

7、lectricitywhentheirparticlesizeisdecreasedandloseferroelectricityentirelyatacriticalsize2-11.ThisisknownasthesizeeffectanditimpedestheprogressofMLCC,soanovelsolutionhasbeeneagerlyanticipated.Here,weproposeMLCCusingacicularBaTiO3particles13.Anultra-thinferr

8、oelectriclayerandhighcapacitycanberealizedbyacicularparticleshavingahighaspectratio.Theshortsideprovidesanultra-thinferroelectriclayerandthelargevolumecausedbythelongsideavoidsthelossofferroelectricityatthecr