Hydrothermal synthesis of β-cobalt hydroxide with various morphologies in water/ethanol solutions
2011
Wang, Bingxi | Lin, Hang | Yin, Zhigang
Various morphologies of cobalt hydroxides have been successfully prepared from cobalt nitrate with the assistance of dimethylglyoxime in water/ethanol solutions by hydrothermal processing at 220°C. The crystalline products are hexagonal phase of β-cobalt hydroxide, and the crystallinity increases as the volume ratio of water to ethanol rises. Hexagonal plate-like, broom-like or straw bundle-like, and grass-like cobalt hydroxides are obtained with water to ethanol ratios of 1:0, 2:1 and 1:2, respectively. The novel bundle-like assemblies are further constructed from lots of nanobelts, which mainly grow along [100] direction and evolve from less-crystalline disc-like structures and semi-crystalline flower-like assemblies as the hydrothermal time extended.
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