Figure 1

Schematics and structural characterization of the 3 samples. (a) Schematic cross-sections of the sample structures. (b) SEM and (c) AFM images of sample P100 (Note that the wall-structures between the cubes are a scanning artifact).
Schematics and structural characterization of the 3 samples. (a) Schematic cross-sections of the sample structures. (b) SEM and (c) AFM images of sample P100 (Note that the wall-structures between the cubes are a scanning artifact).