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 Na 3 PO 4 as morphologydirecting agents, which play important roles in the formation of hierarchical nanocolumn morphology. The hierarchical Co 3 O 4 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 Co 3 O 4 nanocolumns also have been investigated.

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