Template-Free Synthesis and Self-Assembly of CeO2 Nanospheres Fabricated with Foursquare Nanoflakes
Template-Free Synthesis and Self-Assembly of CeO2 Nanospheres Fabricated with Foursquare Nanoflakes
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DOI：
10.1021/jp9065168
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发表时间：
2009-12
影响因子：
3.7
通讯作者：
Rongrong Cui;Wencong Lu;Liangmiao Zhang;B. Yue;Shanshan Shen
中科院分区：
文献类型：
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作者：
Rongrong Cui;Wencong Lu;Liangmiao Zhang;B. Yue;Shanshan Shen
在没有任何模板的情况下，通过简单的水热反应可控制地制备了由大量纳米片状组成的大规模CeO2球形结构。用X射线衍射仪、氮气吸附−脱附实验、透射电子显微镜和高分辨电子显微镜对产物进行了表征。结果表明，直径约为100−230 nm的CeO2结构由多个片状纳米粒子组成，比表面积为24m2/g，并讨论了纳米结构形成的可能机理。还测试了CeO2纳米球和直接沉积CeO2纳米粒子在CO氧化中的催化性能，并通过分析两者的曝光面对催化结果进行了比较和解释。
Large-scale CeO2 spherical architectures composed of numerous nanoflakes have been controllably prepared through a simple hydrothermal reaction without any template. The products were characterized with X-ray diffraction, nitrogen adsorption−desorption experiments, transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). It was found that the CeO2 architecture ca. 100−230 nm in diameter was made up of many nanoflakes with a BET surface of 24 m2/g. The possible mechanism for the nanostructures formation was discussed. The catalytic performance of CeO2 nanospheres and the direct-depositing CeO2 nanoparticles in CO oxidation were also tested, and the catalytic results were compared and explained by analyzing the exposed planes of the two.