Figure 2.

Plan-view and cross-sectional SEM images of the ZnO bilayer electrodes. The weight ratios of nanoparticle (NP) to nanoporous sphere (NS) for the top layers are (a) 10:0, (b) 7:3, (c) 5:5, (d) 3:7, and (e) 0:10, respectively. Blue labeled boxes are higher magnification for the bilayer interface.

Kim et al. Nanoscale Research Letters 2014 9:295   doi:10.1186/1556-276X-9-295
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