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中文摘要：
通过微波辅助法合成粒径均一的CeO2纳米颗粒、纳米立方体和纳米棒。结果表明,通过简单改变微波反应时间可以控制氧化铈形貌的变化。紫外可见光分光光谱测试表明不同形貌的纳米CeO2的紫外吸收能力是不同的,同时CeO2纳米材料的禁带宽度随着形貌由纳米粒子转变到纳米棒而减小。根据对不同微波反应时间的CeO2纳米晶的尺寸、形貌的观察,以及XRD图谱的计算,提出了一种符合实验结果的CeO2纳米材料的生长机制。
英文摘要：
The uniform-sized cerium dioxide nanoparticels,nanocubes,and nanorods were synthesized by an inexpensive microwave-assisted method.The shape of the cerium oxide could be controlled simply by varying the irradiation time.The UV-vis spectrum measurements at various reaction time were used to measure the UV absorption of nanostructure CeO2 and track the morphological evolution.It was found that the absorption peak would shift to the higher wavelength when the CeO2 nanocrystals grew from nanoparticles to nanorods.The band gaps of CeO2 nanomaterials depended on the morphology of nano-CeO2.Based on the observation of shape and size of CeO2 nanocrystals at different irradiation time and calculation from XRD pattern,a possible growth mechanism of CeO2 nanorods was put forward to explain the experimental observation.
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