Y_2O_3和Nd_2O_3介孔薄膜的制备与表征

Preparation and Characterization of Mesoporous Y_2O_3 and Nd_2O_3 Films

以聚乙烯合丁烯-嵌-聚氧乙烯嵌段共聚物(PHB-PEO)作模板,采用蒸发诱导自组装方法,分别制备了Y2O3和Nd2O3介孔薄膜.用小角、广角X射线衍射和透射电子显微镜对薄膜样品在不同的热处理阶段进行了表征.结果表明,所制备的Y2O3和Nd2O3薄膜样品呈现一种大孔径(平均孔径分别约为11.5和12.5nm)、有序的立方扭曲球形孔排列、稳定于450℃并具有部分晶态孔壁结构的介孔薄膜材料.

With poly （ethylene-co-butylene） -block-poly （ ethylene oxide） block copolymer （ PHB-PEO ） as the template, mesostructured Y2O3 and Nd2O3 thin films were successfully synthesized through the well-documented evaporation-induced self-assembly approach. The obtained samples calcined at different temperatures were characterized in detail by using small- and wide-angle X-ray diffraction and transmission electron microscopy （TEM）. The results show that our presented Y2O3 and Nd2O3 thin films possessed an Im3m body-centered- cubic（BCC） array of distorted spherical pores with an average pore diameter of about 11.5 and 12.5 nm, respectively. Furthermore, the partial crystalline pore walls can stabilize at 450 ℃. The investigation also indicated that a rapid self-assembly process is necessary to generate the mesoporous Y2O3 and Nd2O3 thin films. It can be achieved by the utilization of PHB-PEO template and the fast dip-coating process of evaporation-induced self-assembly.