preparation_and_properties_of_magnetic–photoluminescent_bifunctional_CoFe2O4@Y2O3_Eu3+

JMaterSci:MaterElectron(2014)25:4259–4267DOI10.1007/s10854-014-2158-x

Coaxialelectrospinningpreparationandproperties

ofmagnetic–photoluminescentbifunctionalCoFe2O4@Y2O3:Eu3+coaxialnano bers

FeiBi XiangtingDong JinxianWangGuixiaLiu

Received:11April2014/Accepted:4July2014/Publishedonline:15July2014ÓSpringerScience+BusinessMediaNewYork2014

AbstractCoFe2O4@Y2O3:Eu3?magnetic– uorescentbifunctionalcoaxialnano bershavebeensuccessfullyobtainedviacalcinationofthe[CoFe2O4/PVP]@[(Y(NO3)3?Eu(NO3)3)/PVP]compositecoaxialnano -berswhichwerefabricatedbycoaxialelectrospinningtechnique.ThediameterofCoFe2O4@Y2O3:5%Eu3?magnetic– uorescentbifunctionalcoaxialnano berswas133±17nm.Strong uorescenceemissionpeaksofEu3?intheCoFe2O4@Y2O3:Eu3?coaxialnano berswereobservedandassignedto5D0?7F1(588nm),5D0?7F1(593nm),5D0?7F1(599nm),5D0?7F2(612nm)and5

D0?7F2(630nm)energylevelstransitionsofEu3?ions,andthepredominantemissionpeakwaslocatedat612nm.ComparedwithCoFe2O4/Y2O3:Eu3?compositenano bers,CoFe2O4@Y2O3:Eu3?magnetic– uorescentbifunctionalcoaxialnano berssimultaneouslyprovidedhighermagnetismand uorescentintensity.Thecolor,photoluminescentintensityandmagnetismofthecoaxialnano berscanbetunedviaadjustingthediversityandcontentof uorescentcompoundsandthecontentofmagneticcompounds.FormationmechanismofCoFe2O4@Y2O3:Eu3?coaxialnano berswasalsopresented.Thebifunctionalmagnetic–photoluminescentCoFe2O4@

3?

Y2O3:Eucoaxialnano bershavepotentialapplicationsinmany eldsduetotheirexcellentmagnetismand uorescence.

1Introduction

Electrospinningisoneofthemosteffectiveandconvenienttechniquestoprocessviscoussolutionsormeltsintocon-tinuous berswithdiametersrangingfrommicrometertosubmicronornanometer.Someinorganicandorganicnanomaterialshavebeenpreparedbyelectrospinningtech-nique[1–7].Recently,coaxialelectrospinningprovidesanalternativeroutetodesignandfabricatenewfunctionalizedcompositenano berswithcore–shellstructures[8,9].

Nowadays,rare-earth-dopednanomaterialshavebeenwidelyusedinhighperformanceluminescentdevices,mag-netsandotherfunctionalmaterials[10,11].Y2O3hasreceivedconsiderableattentionwhendopedwithrareearthionsowingtotheirinterestingproperties[12,13].Y2O3dopedwithEu3?ionsisanimportantphosphorwithavarietyofapplicationsinmanyluminescentandopticaldevices.TheinterestinthesynthesisofY2O3:Eu3?phosphorismotivatedbytheneedtoimprovetheluminescenceef ciencyofmaterials[14].

Recently,magneticnanomaterialshaveattractedincreas-inginterestofscientistsowingtotheirpracticalandpotentialapplications,suchasbiomacromoleculesseparation,catalystseparationanddrug/genedelivery[15–18].Amongthemag-neticmaterials,cobaltferrite(CoFe2O4)hasbeenstudiedintensivelyduetoitssigni cantproperties,suchasmoderatesaturationmagnetization,remarkablechemicalandthermalstabilitiesandgoodmechanicalhardness.Ithasbeenbroadlyusedasatraditionalhigh-frequencylowlosspowerconverter,stresssensorandactuator[19–22].

Magnetic–photoluminescentbifunctionalnanomaterialssimultaneouslypossessexcellentmagnetismandlumines-cence,andhavebeenappliedinmedicaldiagnosticsandopticalimaging.Presently,studiesaremainlyfocusedonthepreparation,propertiesandapplicationsofmagnetic–photoluminescentbifunctionalnanoparticles[23–25].In

F.BiÁX.Dong(&)ÁJ.WangÁG.Liu

KeyLaboratoryofAppliedChemistryandNanotechnologyatUniversitiesofJilinProvince,ChangchunUniversityofScienceandTechnology,Changchun130022,Chinae-mail:dongxiangting888@163.com

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