Controllable Preparation And Properties Of Rare Earth Oxide Nanostructures

YbMn_xO_y,Yb_xMn_yO_z:Eu³⁺,LnFe_xO_y/AAO?Ln=Ce,La,Nd?nano-array structural materials were controllably synthesized in anodic aluminum oxide?AAO?template by negative pressure suction filtration and chemical co-precipitation method.Their morphology,structure and chemical composition were characterized with SEM,TEM,XRD,EDS,and the photo catalytic degradation,the fluorescence performance of doping Eu³⁺and the absorbing wave for the corresponding nanostructure were studied by Xenon Lamp,Fluorescence Spectrophotometer and Vector Network Analyzer,respectively.The main results are as follow:1.The nanotube and nanowire arrays of YbMn_xO_y were controllably synthesized in AAO template,respectively.The photo catalytic degradation efficiency of Congo Red solution was studied by spectrophotometer with Xenon Lamp.The results show that the photo catalytic degradation rates were respectively 99.8%and 69.7%corresponding to 10mg YbMn_xO_y nanotube or nanowire as catalyst in the 100mL of Congo Red solution?40mg/L?within 90 min.,and the stability and recyclability were satisfying.2.The nanotube arrays,nanowire arrays and nano particles of Yb_xMn_yO_z:Eu³⁺had been studied with 394nm exciting light source,respectively.The results show when Eu³⁺doping concentration was 5vol%,the fluorescence intensity reached to maximum.Compared with the nanotube,nanowire and nanoparticles of Yb_xMn_yO_z:Eu³⁺,the nanotube structure possessed even more stronger fluorescence performance,and there were three peaks at 480 nm and 590 nm and 702 nm,respectively,which the peaks of 590 nm and 702nm were corresponding to the ₅D⁰-₇F¹?₅D⁰-₇F⁴ of Eu³⁺doping,and the peaks of 480 nm was from the two-photon excited cooperative fluorescence.3.The microwave absorption for AAO template and LnFe_xO_y/AAO?Ln=Ce,La,Nd?nanotube arrays were studied.The results indicated that in the region of2-18GHz,AAO template and LnFe_xO_y/AAO nanostructure were all possessed wave absorption,and the later was stronger.When the lowest reflectance value was-17.30dB,and the reflectance was less than-10dB at 13.28GHz,the effective absorption bandwidth?90%of microwave absorption?was as high as 2.60GHz.Meanwhile,the low density of AAO and LaFe_x O_y/AAO nanotube arrays were potential used to the fields of camouflage coatings or electronic equipment,microwave silencing and electromagnetic protection.