Title: Crystallization behavior of nano-ceria powders by hydrothermal synthesis using a mixture of H2O2 and NH4OH
Abstract: Homogeneous and well-crystallized nano-ceria (CeO2) powders were produced by hydrothermal synthesis using a mixture of H2O2 as the oxidizer and NH4OH as the mineralizer. The precipitates were prepared by mixture ligands of OH and OOH derived from NH4OH and H2O2. The hydrothermal synthesis was conducted at 200 °C for 6 h. The synthesized ceria powders were characterized as the crystalline phase identification by X-ray diffractometry, the chemical bonding by infrared spectrophotometer (FT-IR) and the morphology and particle size by transmission electron microscopy (TEM). Crystallization behavior of ceria powders using a mixture of oxidizer and mineralizer was more influenced by OOH ligands than by OH ligands to form Ce(OH)x(OOH)4−x as precursor with increasing concentrations of H2O2 with 10–20 times of the cerium(III) ion. In all samples, synthesized particle size was decreased with increasing concentration of oxidizer ranging from 6 to 12 nm in diameter. Morphology and size distribution of synthesized particles were relatively spherical and uniform, respectively.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 122
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