Controllable Synthesis Of Rare Earth Oxide Nanostructure And Fluorescence Performances

The Ce_xM_1-xO_y?M=La,Co,Eu?,Ce_xLa_1-xO_y:Eu³⁺ and Ce_xCo_1-xO_y:Eu³⁺ rare earth oxides nanowires have been prepared in anodic aluminum oxide?AAO?templates by suction filtration at subatmospheric.By scanning electron microscopy?SEM?,transmission electron microscopy?TEM?,selected area electron diffraction?SAED?,X-ray diffraction?XRD?energy dispersive spectra?EDS?,the morphology,phase composition and elements composition of the prepared nanowires were characterized.Meanwhile,the influence factors of morphology,the growth mechanism and fluorescence performances of the nanowires,have been investigated.The main conclusions are as following:1.The results indicate that rare earth oxides nanowires are amorphous with uniform diameter?about 80-100 nm in diameter consistent with AAO templates?,orderly setting,respectively.On the basis of the suction filter pressure,concentrations of salt solution,codeposition time and temperature,the controllable synthesis of nanowires is accomplished.Next5the results of the fluorescence luminous intensity show that the Ce³⁺,Co³⁺,La³⁺,itself no luminous performance under the 394 nm excitation,but can be used as the sensitizer,quenching agent and substrate materials of luminescent centers Eu³⁺ respectively.2.The Ce_xM_1-xO_y nanowires fluorescence emission spectrum display that Ce_xLa_1-xO_y and Ce_xCo_1-xO_y nanowires' fluorescence intensity is zero,while Ce_xEu_1-xO_y nanowires have strong fluorescence emission intensity at 593nm and 710nm under the 394 nm excitation.The fluorescence emission spectra showed that the fluorescent intensity increase as the Eu³⁺ content increases initially and decrease afterwards and reach the maximum when Eu³⁺ content is 5%.3.Dope Co³⁺ into Ce_xEu_1-xO_y and synthesis Ce_xCo_1-xO_y:Eu³⁺ nanowire arrays.The fluorescence emission spectra showed that cobalt ions result in fluorescence quenching under the 394 nm excitation.With the Co³⁺ molar percentage increases,the fluorescence intensity was gradually decreased,when the doped Co³⁺ molar percentage increase to 15%,the fluorescence of Ce_xCo_1-xO_y:Eu³⁺ nanowire arrays was quenched.4.Finally,dope La³⁺ into Ce_xEu_1-xO_y and synthesis Ce_xLa_1-xO_y:Eu³⁺ nanowire arrays.Compared with the fluorescent properties of Ce_xEu_1-xO_y nanowires,the Ce_xLa_1-xO_y:Eu³⁺ nanowires' fluorescence intensity significantly enhanced.On the other hand,the fluorescence emission spectra showed that the fluorescent properties increase as the Eu³⁺ content increases initially and decrease afterwards and reach the maximum when Eu³⁺ content is 5%.