中文摘要：

采用高温溶液法分解硝酸铈制备了不同形貌的CeO2纳米晶体。采用XRD、TEM和FTIR研究了表面活性剂和分解温度对纳米晶体尺寸、形貌和物相结构的影响。实验结果表明,控制表面活性剂的种类（如油胺、油酸、二甲基硅油）和数量,可以得到具有球形、线形、＂四叶草＂形和类四边形的纳米晶体。随着分解温度的提高,CeO2纳米晶体的形貌趋于完整,粒径逐渐变大。分解温度达到300℃时可以得到线形的CeO2纳米晶体,温度达到320℃得到的线形粒子的长径比可以达到45左右。通过紫外-可见光吸收光谱可知,所得不同形貌的CeO2纳米晶体均具有较好的紫外吸收性能和可见光的透过性能,所有样品对紫外光的吸收均达到90%以上,可以有效的用作紫外屏蔽材料。

英文摘要：

CeO2nanocrystals with different morphologies were synthesized with high temperature solution-phase method by decomposing cerium nitrate hexahydrate. The obtained samples were characterized by X-ray diffraction（ XRD）,transmission electron microscopy（ TEM） and Fourier transform infrared spectroscopy（ FTIR） to investigate the sizes,shapes and structures of the nanocrystals. The results show that by adjusting the synthesis condition parameters such as type of solvents and surfactants,nanoparticles with different morphologies such as sphere,nanowire,yotsunoha and qusi-cubic can be produced.The shape of CeO2nanocrystals becomes sounder along with a higher decomposition temperature. Nanoparticles with wired-shape can be obtained when the reaction temperature is higher than 300℃,while the aspect ratio of the nanowires of CeO2nanocrystal synthesized under 320℃ reaches up to 45. Through ultraviolet – visible absorption（ UV – Vis） spectroscopy analysis,all samples with different shapes have high ultraviolet absorption more than 90% and great visible light transmittance and of course this property can make them as a fine ultraviolet screening material.