Nano Archive

Crystallization behavior of nano-ceria powders by hydrothermal synthesis using a mixture of H2O2 and NH4OH

Lee, Jin-Seok and Choi, Sung-Churl (2004) Crystallization behavior of nano-ceria powders by hydrothermal synthesis using a mixture of H2O2 and NH4OH. Materials Letters, 58 (3-4). 390 - 393.

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Official URL: http://www.sciencedirect.com/science/article/B6TX9...

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.

Item Type:Article
Uncontrolled Keywords:Ceramics; Powder technology; CeO2; Hydrothermal; Hydrogen peroxide
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
ID Code:6900
Deposited By:SPI
Deposited On:20 Aug 2009 12:01
Last Modified:20 Aug 2009 12:01

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