Fig. 4. New-type PAA tuned using imprinting pressure in Step II. (a) Schematic of the surface topography of pre-patterned Al sheets tailored using imprinting pressure. Typical SEM top and side views of new-type PAA obtained by anodization of pre-patterned Al sheets under different imprinting pressures: (b) 0.15 GPa, (c) 0.25 GPa and (d) 0.35 GPa. The scale bar represents 100 nm.
