Fig. 2. Schematics and scanning electron microscopic (SEM) images show cylindrical micropores-patterned surfaces (single level surfaces, (a)$\sim$(c)), nanoparticles-coated hierarchically structured surfaces ((d)$\sim$(f)). The scale bars in (b), (e) and (c), (f) are 50 $\mu $m and 10 $\mu $m, respectively. The inset in (e) whose scale bar is 200 nm is the detailed SEM image of nanoparticles
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