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(a) Illustrative scheme describing the most representative geometric features of nanoporous anodic alumina (NAA) (i.e., pore diameter, pore length and interpore distance); (b) top and cross-section scanning electron microscopy (SEM) images of NAA (scale bars = 400 and 250 nm, respectively); (c) illustration describing a basic electrochemical anodisation cell used to produce NAA.
