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Nanobelts of hexagonal close-packed cobalt have been synthesized by a hydrothermal reduction processat 160 °C. The as-synthesized nanobelts, with a rectangular cross section, are 200–500 nm indiameter, 50–80 nm in thickness and a few hundreds of micrometres in length.The Co nanobelts are single crystalline and grow preferentially along the[001] direction. Furthermore, the coexisting nanosheets with zigzag edges are2–4 µm in diameter and several tens of nanometres in thickness. The hysteresis loop at roomtemperature of the as-obtained product shows a ferromagnetic behaviour. In addition, someinfluential factors as regards the morphologies of the final products were alsodiscussed. [ABSTRACT FROM AUTHOR]