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FESEM images of a the cross-section of PAA fabricated in 1 wt% H3PO4 under 0°C and 180 V for 10 min and bent before testing, b the low-magnification image of (a), (c) and (d) the fracture sections of PAA after cutting with a pair of scissors and scratching the surface with a diamond knife, respectively. The PAAs in c and d are fabricated in 5 wt% H3PO4 at 15°C for 30 min without second anodization
