Photochemical Synthesis of Monodispersed Ceria Nanocrystals in

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1、ARTICLEpubs.acs.org/crystalPhotochemicalSynthesisofMonodispersedCeriaNanocrystalsinSimpleCeriumNitrateSolutionwithoutAdditivesKaiKamada,*KojiHoriguchi,TakeoHyodo,andYasuhiroShimizuDepartmentofMaterialsScienceandEngineering,FacultyofEngineering,NagasakiUniversity,1-14Bunkyo-machi,Nagasaki852

2、-8521,JapanbSSupportingInformationABSTRACT:Wedevelopedanovelphotochemicaltechniqueforpreparationofceria(CeO2)nanocrystalsinsimpleaqueoussolutioncontainingonlyCe(NO3)3,wherenoadditiveandnoheatingarerequired.UnderUVlightillumination,photochemicalreductionofNO3resultedinformationofNO2accompa

3、niedbyhydroxylradicals3þ(3OH)asintermediatespecies.ThehydroxylradicalscouldoxidizeCetotetravalent2þstate(Ce(OH)2),thenCeO2nucleiwereformedthroughdeprotonation.TheaqueousCeO2solwaspreparedviadialysisofthereactedsolutionagainstdeionizedwatertoremovetheexcesselectrolyte.Sincethephotooxidationp

4、rocesshomoge-neouslyoccursovertheentiresolutionduetohighopticaltransmittanceofthesolvent,theparticlesizedistributionbecomesrelativelynarrowandthemeandiametercanbeeasilycontrolledbyadjustingtheinitialconcentrationofCe(NO3)3.ThepreparedCeO2nanoparticleswerepotentagainstoxidativepolymerization

5、ofphenolicderivatives(guaiacol)atroomtemperature.ThispaperclarifiesthephotochemicalformationmechanismofCeO2nanocrystalsintheCe(NO3)3solution,andtheadvantagesoftheproposedmethodarediscussedindetail.’INTRODUCTIONcanbeapplicableforvariousresearchandindustrialfields.Light3þAswell-known,ceriumisab

6、undantinnatureamongrare-earthirradiationtoCesaltsolutionbringsaboutformationofCeO23þnanoparticlesunderpresenceofphoto-oxidizer.Asaresult,Ceelements,anditsoxide(ceria,CeO2)anddopedoxideshavebeenIVistransformedintoCestatebythelightenergyandsubse-widelyemployedforvariousapplicationsduetotheiru

7、niqueproperties.Forexample,theirnanocrystals(nanoparticles)havequentlyformsinto(hydrated)CeO2nanoparticles.Inthisstudy,1weemploynitrateionsasphoto-oxidizingagentsinceultravioletattractedattentionascocatalystsfornoblemetals,ultravioletlight23(UV)lightirra