Hierarchical β-Ni(OH)2 and NiO carnations assembled from nanosheet building blocks

beta-Ni(OH)(2) carnationlike structures assembled from nanosheet building blocks were successfully synthesized via a hydrothermal method through the hydrolysis of nickel acetate in mixed solvents of water and glycerol. NiO carnations assembled from nanosheets with nanopores were obtained by thermal decomposition of the as-synthesized carnationlike beta-Ni(OH)(2) at 400 degrees C for 2 h in air. The as-obtained -Ni(OH)2 carnations showed a different cyclic voltammogram (CV) curve from that of beta-Ni(OH)(2) nanosheets.