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Hydrothermal Synthesis of Hierarchical Nanocolumns of Cobalt Hydroxide and Cobalt Oxide

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journal contribution
posted on 23.04.2009 by Yongzheng Shao, Jing Sun, Lian Gao
In this paper, we report a facile method to prepare high-yield one dimensional hierarchical β-Co(OH)2 nanocolumns through one-step hydrothermal synthesis with hydrazine hydrate and Na3PO4 as morphology-directing agents, which play important roles in the formation of hierarchical nanocolumn morphology. The hierarchical Co3O4 nanocolumns are obtained by the β-Co(OH)2 nanocolumns annealed at 400 °C for 4 h. The formation mechanism of hierarchical nanocolumns has been clearly demonstrated by studying morphology evolution processes of β-Co(OH)2 nanocrystals upon reaction time, which undergo two steps, the formation of nanorods and then growing sideways in the form of thin nanoplatelets to form hierarchical nanocolumns. Moreover the UV−vis spectra and magnetic properties of Co3O4 nanocolumns also have been investigated.