Abstract
Hierarchical mushroom-like cobalt materials were synthesized by galvanostatic electroplating. The morphology of the product, which can evolve from cone-like to mushroom-like nanostructures, is controllable by changing the deposition parameters. The nanostructure is a single hexagonal close-packed crystal with a preferential growth direction. The proposed growth mechanism is based on the metal ion deficient layer (MIDL) theory which explains both the time-dependent morphology evolution and the effects of the crystalline modifier C2H4(NH2)2. Depositions using several organic crystalline modifiers were compared; only C2H4(NH2)2 yielded the mushroom-like structure.
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