Fabrication And Performance Of Rare Earth Oxide Nanowire

In this paper, NdxSm1-xOy and NdxSm1-xOy nanowires arrays have been synthesized in the AAO template by suction filtration at subatmospheric pressure (SFSP). The morphology, structure, composition, and magnetism of the nanowires arrays have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), energy dispersive spectra (EDS), selected area electron diffraction (SAED), photoluminescence and vibrating sample magnetometer (VSM), respectively. The main research and results are as follow:1. The AAO template has been fabricated via two-step anodization with oxalic solution and the morphology, structure and photoluminescence properties have been investigated. XRD indicated that the AAO template is amorphous in structure. Fluorescence spectrum showed that there is no fluorescence emission peak for AAO template at550nm to750nm with399nm light excited.2. The NdxSm1-xOy nanowires arrays have been synthesized in the AAO template by SFSP. SAED and XRD showed that the NdxSm1-xOy nanowires are amorphous in structure. EDS revealed that the ratio of atomic percentage of La:Sm:O is6.55:0.65:80.65, the ratio of mass percentage of La:Sm:O is35.18:3.81:49.91. Fluorescence spectrum indicated that there is a strong fluorescence emission peak for NdxSm1-xOy nanowires at605nm which is corresponding to4G5/2â†'6H7/2with399nm light excited and the optimum doping concentration of Sm3+is8%. Hysteresis loops showed that there is obvious magnetic anisotropy for NdxSm1-xOy nanowires arrays in the parallel and perpendicular direction. The coercivity, remanence and squareness ratio of the NdxSm1-xOy nanowires arrays different changes with the increase in the diameter of the nanowires.3. The NdxSm1-xOy nanowires arrays have been assembled in the pores of AAO template by the method of filtering at subatmospheric. SAED and XRD indicated that the NdxSm1-xOy nanowires are amorphous in structure. EDS showed that the NdxSm1-xOy nanowires contain three elements Nd, Sm and O. The NdxSm1-xOy nanowires arrays exhibited two fluorescence emission bands around615nm and690nm under the excitation of399nm, which are assigned to the electric dipole4G5/2â†'6H7/2and4G5/2â†'6H9/2transitions of the Sm3+, respectively. The fluorescence spectrum revealed that for all nanowires, the emission intensity increased with increasing the diameter of the nanowires up to160nm, reaching the maximum luminescence intensity and the optimum doping concentration of Sm3+is8%. The hysteresis loops characterized by VSM indicated that the easily magnetized direction of NdxSm1-xOy nanowires arrays is perpendicular to nanowire arrays and that is magnetic anisotropy as a result of the shape anisotropy.