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Monodisperse CeO 2 sub‐micro spherical aggregates with controllable building blocks
Author(s) -
Wei Jingjing,
Yang Zhijie,
Yang Yanzhao,
Wei Huiying
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201000479
Subject(s) - dispersity , high resolution transmission electron microscopy , transmission electron microscopy , chemical engineering , materials science , hydrothermal circulation , scanning electron microscope , nanotechnology , nanocrystal , polymer chemistry , composite material , engineering
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. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)