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稀土离子掺杂的纳米氧化铈荧光粉体的改性燃烧合成.docx

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稀土离子掺杂的纳米氧化铈荧光粉体的改性燃烧合成 Introduction Ceriumoxide(CeO2)nanoparticlesarewidelyusedinvariousapplicationsduetotheiruniquepropertiessuchashighoxygenstoragecapacity,highsurfacearea,goodthermalstability,andexcellentcatalyticactivity.However,thepoorluminescenceofpureCeO2nanoparticlesmakesthemunsuitableforuseinlightinganddisplayapplications.DopingwithrareearthionsisonewaytoimprovetheluminescenceofCeO2nanoparticles.Inthispaper,wediscussthemodificationofCeO2nanoparticlesbydopingwithrareearthionstoobtainhighlyluminescentnanophosphors. SynthesisofCeO2Nanoparticles CeO2nanoparticlesweresynthesizedbyasimplecombustionmethod.Astoichiometricamountofceriumnitratewasdissolvedindistilledwaterandammoniumhydroxidewasaddeddropwisetothesolutionwhilestirring.Thesolutionwasthensubjectedtovigorousstirringtoensuretheformationofauniformgel.Thegelwasdriedinanovenat80°Cfor12hoursandthensubjectedtocalcinationat600°Cfor3hours.TheresultingpowderwasthengroundandsievedtoobtainCeO2nanoparticles. DopingofCeO2NanoparticleswithRareEarthIons Rareearth-ion-dopingwascarriedoutbyaconventionalco-precipitationmethod.Astoichiometricamountofceriumnitratewasdissolvedindistilledwater,andthenasmallamountoftherareearthions(Eu3+,Tb3+,orDy3+)wereaddedtothesolutionandstirredfor2hours.Asolutionofsodiumhydroxidewasslowlyaddedtothemixturewhilestirringcontinuously,untilthepHofthesolutionreached9.Thesolutionwasthenstirredforanother2hourstoensureagoodmixingoftherareearthionswiththeCeO2nanoparticles.Themixturewasthencentrifugedandwashedwithdistilledwaterseveraltimestoremoveanyimpurities.Finally,thedopedCeO2nanoparticlesweredriedinanovenat80°Cfor12hours. CharacterizationoftheDopedCeO2Nanoparticles ThesynthesizedanddopedCeO2nanoparticleswerecharacterizedbyvarioustechniquessuchasX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),andFourier-transforminfraredspectroscopy(FTIR). TheXRDpatternofthepureanddopedCeO2nanoparticlesshowedthatallsampleshadacubicfluoritestructure(Figure1).Thisindicatedth