Structural and morphological characterization of cerium oxide nanocrystals prepared by hydrothermal synthesis
Structural and morphological characterization of cerium oxide nanocrystals prepared by hydrothermal synthesis
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DOI：
10.1021/nl062677b
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发表时间：
2007-02-01
期刊：
影响因子：
10.8
通讯作者：
Adschiri, Tadafumi
中科院分区：
文献类型：
--
作者：
Kaneko, Kenji;Inoke, Koji;Adschiri, Tadafumi
采用高分辨率透射电镜（HRTEM）和三维电子断层扫描（3D-ET）对水热合成法制备的胶体氧化铈（CeO2）纳米晶体进行了表征。然后利用Blochwave和多层模拟对单个CeO2纳米晶体的HRTEM图像进行模拟，以确定原子排列和终止原子。边长分布在5.0 ~ 8.0 nm之间，平均边长为6.7 nm。HRTEM图像显示，CeO2颗粒略有截断，露出{220}切面。3D-ET显示CeO2纳米晶体主要暴露出{200}立方面。纳米晶体在棱角处被截断，露出{111}八面体面，在棱角处被截断，露出{220}十二面体面。此外，3D-ET显示了一些四边形的CeO2纳米晶体的存在。
Colloidal cerium oxide (CeO2) nanocrystals prepared by hydrothermal synthesis were characterized by high-resolution transmission electron microscopy (HRTEM) and three-dimensional electron tomography (3D-ET). HRTEM images of individual CeO2 nanocrystals were then simulated by Blochwave and multislice simulations to determine the atomic arrangement and terminating atoms. The edge length distributions were between 5.0 and 8.0 nm with an average edge length of 6.7 nm. The HRTEM images showed that the CeO2 particles were slightly truncated revealing {220} facets. 3D-ET revealed that the CeO2 nanocrystals exposed predominantly {200} cubic facets. The nanocrystals were truncated at the corners exposing {111} octahedral facets and at the edges {220} dodecahedral facets. Furthermore, 3D-ET revealed the presence of some tetragonal-shaped CeO2 nanocrystals.