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Title: Morphogenesis of highly uniform CoCO3 submicrometer crystals and their conversion to mesoporous Co3O4 for gas-sensing applications
Authors: Li, C.C.
Yin, X.M.
Wang, T.H.
Zeng, H.C. 
Issue Date: 27-Oct-2009
Citation: Li, C.C., Yin, X.M., Wang, T.H., Zeng, H.C. (2009-10-27). Morphogenesis of highly uniform CoCO3 submicrometer crystals and their conversion to mesoporous Co3O4 for gas-sensing applications. Chemistry of Materials 21 (20) : 4984-4992. ScholarBank@NUS Repository.
Abstract: Transition metal nitrates, carbonates, hydroxides, hydroxy oxides, 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 of their respective solid, precursors. Due to high crystal uniformity and specific surface areas in the range of 140-149 m2/g, the mesoporous Co 3O4 exhibits enhanced performances for ethanol and carbon monoxide sensing. © 2009 American Chemical Society.
Source Title: Chemistry of Materials
ISSN: 08974756
DOI: 10.1021/cm902126w
Appears in Collections:Staff Publications

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