Selective and controlled synthesis of α- and β-cobalt hydroxides in highly developed hexagonal platelets

被引：665

作者：

Liu, ZP ^{[1
]}

Ma, RZ ^{[1
]}

Osada, M ^{[1
]}

Takada, K ^{[1
]}

Sasaki, T ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 40期

关键词：

D O I：

10.1021/ja0523338

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on the controlled synthesis of single-crystal platelets of alpha- and beta-Co(OH)(2) via homogeneous precipitation using hexamethylenetetramine as a hydrolysis agent. The alpha- and beta-Co(OH)(2) hexagonal platelets of several micrometers in width and about 15 nm in thickness were reproducibly yielded in rather dilute CoCl2 solutions in the presence and absence of NaCl at 90 degrees C, respectively. The phase and size control of the products were achieved by varying both CoCl2 and NaCl concentrations. Polarized optical microscope observations revealed clear liquid crystallinity of colloidal suspensions of these high aspect-ratio platelets. The as-prepared alpha-Co(OH)(2) containing interlayer chloride ions was intercalated with various inorganic or organic anions, keeping its high crystallinity and hexagonal platelike morphology.

引用

页码：13869 / 13874

页数：6

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