材料科学
结晶
热液循环
水热合成
纳米-
化学工程
纳米技术
复合材料
工程类
作者
Jin‐Seok Lee,Seok Cheol Choi
标识
DOI:10.1016/s0167-577x(03)00508-1
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI