Abstract
Transition metal nitrates, carbonates, hydroxides, hydroxyoxides, and so forth are often used as solid precursors to synthesize their respective nanostructured metal-oxides after chemical/thermal conversion. However, synthesis of submicrometer uniform crystalline particles of this class of compound intermediates remains as a challenging but less studied area in nanomaterials research. In this work, we report a polyol process for controlled growth of cobalt carbonate (CoCO3). A preparative investigation on morphogenesis of CoCO3 crystals has been carried out, and three types of highly uniform CoCO3 products (i.e., peanut-like, capsule-like, and rhombus crystals) in the submicrometer region have been synthesized at 200 °C under batch conditions. Uniform particles of tricobalt tetroxide (Co3O4) have also been obtained at 300 °C from the CoCO3 submicrometer crystals after thermal transformation in laboratory air. The Co3O4 powder products possess mesoporosity and essentially preserve the pristine morphologies...
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