Nanoflakes cobalt hydroxide

Kong, L. B., M. Liu, J. W. Lang, Y. C. Luo, and L. Kang. 2009. Asymmetric supercapacitor based on loose-packed cobalt hydroxide nanoflake materials and activated carbon. Journal of the Electrochemical Society 156 A1000-A1004. 

Figure 1.12 Overview of manganese oxide and cobalt hydroxide nanoflakes. (a,b) Manganese oxide with (a) FETEM image and Tyndall light scattering inset and (b) HAADF-STEM image of magnified flakes (c,d) Cobalt hydroxide nanoflakes with (c) FETEM image and dispersed inset and (d) HAADF-STEM of mosaic structure. Reproduced from Ref [47], by permission of the Royal Society of Chemistry.

The results from both syntheses have indicated that tailoring the polymer template for a specific metal precursor could yield functional nanomaterials with highly controlled properties. The nanoflakes of manganese oxide and cobalt hydroxide were synthesized with mosaic interiors that were ascribed to a stepwise crystal growth. Similar to the formation shown in Figure 1.11, this growth can be understood as a series of inhibitions and regrowths at the defect sites, as demonstrated previously for the echinoderms. 

Oaki, Y. and Imai, H. (2007) Biomimetic morphological design for manganese oxide and cobalt hydroxide nanoflakes with a mosaic interior. Journal of Materials Chemistry, 17, 315-21. 

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