Controllable Synthesis And Performances Of Rare Earth Oxide Nanostructure

We have employed anodic aluminium (AAO) as template to prepare NdCoxOy、 LaNdxOy、NdCoxOy:Eu、LaNdxOy:Eu rare earth oxide nanoarrays nanostructure by suction filtration at subatmospheric pressure. The detailed researches of the thesis are as follows:1. The different nanopores porous anodic aluminum oxide (AAO) template have been fabricated by two-step anodization using in sulfuric, oxalic acid and phosphoric acid. The NdCoxOy nanowire arrays have been successfully fabricated in AAO by suction filtration at subatmospheric pressure (SFSP). The morphology, structure, chemical composition and magnetic performance of NdCoxOy nanowires have been characterized by scanning electron microscope(SEM)、transmission electron microscope (TEM)、x-ray diffraction (XRD)、energy dispersive spectra (EDS) and vibrating sample magnetometer(VSM). The results show the NdCoxOy nanowires is amorphous in structure. There are obvious magnetic anisotropy for NdCoxOy nanowire arrays, and the easily magnetized direction is parallel to the nanowire arrays.2. The NdCoxOy:Euand LaNdxOy:Eu nanotube arrays have been synthesized by the method of SFSP assisted AAO template. The morphology and the crystal structure have been investigated and luminescence Properties have been studied. The results show that the nanotubes are both amorphous in structure, the diameter of nanotube is homogeneous. The result of the fluorescence spectrum for the two nanotubes indicates that there are both a strong broad emission peak at593nm under394nm excitation characterized as transition5D0-7F1of the Eu3+ions, which is not related to the substrate.3. LaNdxOy nanowire arrays and LaNdxOy nanotubes arrays have been prepared. We have researched heat treatment technology on the influence of the structure of LaNdxOy nanowire arrays, luminescence Property of LaNdxOy:Eu3+nanowire arrays, we find thermal treatment temperature do not influence the structure of LaNdxOy nanowire arrays, but luminescence intensity of LaNdxOy:Eu nanowire arrays increases with increasing the calcination temperature. The result reveals that the luminescence intensity of LaNdxOy:Eu nanowires is weaker than that of LaNdxOy:Eu nanotubes, and the luminescence intensity of LaNdxOy:Eu nanowires increases with decreasing the diameter of the nanowires. The magnetic property of LaNdxOy nanotube arrays shows that the squareness along the parallel direction is higher than that of the perpendicular direction, and it exhibits obvious soft ferromagnetism in both parallel and perpendicular directions.