标题：Monodisperse CeO_2 sub-micro spherical aggregates with controllable building blocks
作者：Wei, J.;Yang, Z.;Yang, Y.;Wei, H.
作者机构：[Wei, J] Key Laboratory for Special Functional Aggregate Materials of Education Ministry, School of Chemistry and Chemical Engineering, Shandong Unive 更多
通讯作者地址：[Yang, YZ]Shandong Univ, Key Lab Special Funct Aggregate Mat, Educ Minist, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.
来源：Crystal Research and Technology: Journal of Experimental and Industrial Crystallography
关键词：CeO_2;crystal growth;nanomaterials;spherical aggregates
摘要：Monodisperse CeO_2 spherical aggregates with diameters ranging from 200 to 300 nm have been successfully synthesized through a facile hydrothermal method. The structure and morphology of the samples were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and field-emission scanning electron microscopy (FE-SEM). The building blocks (primary nanocrystals) of the spherical aggregates could be effectively tuned by adding different amount of urea. Furthermore, N_2 adsorption/desorption experiment displays a gradual increase of BET surface areas of spherical aggregates with increasing the amount of urea. Finally, the formation mechanism of CeO_2 spherical aggregates was preliminarily discussed.