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Xia and co-workers reported synthesis
of a Co3O4 monolayer hollow-sphere array obtained via a wellorganized
and close-packed PS monolayer array (Fig. 1a and b).
Also Co3O4 nanoflakes with a thickness of about 20 nm may fill
the interstices between the hollow spheres and show mesoporous
walls with finer pores in the size range of 2¨C5 nm (Fig. 1c and d).

£¨Fig. 2a and b£© show the low-magnification TEM and SEM
images of the initial CoO hollow spheres and Co3O4 hollow
derivatives, this clearly demonstrates the competitive transformation
of CoO hollow spheres into Co3O4 ones.

(1) preparation of hard templates with
functionalized surfaces; (2) coating the templates with designed
materials or decoration of inorganic shells; and (3) selective
elimination of the templates to obtain hollow structures. In this
section, we will mainly introduce several kinds of hard templates:
colloidal polystyrene (PS) or carbon spheres (CCSs), silica,
hollow spherical precursors, and bio-templates.

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