“…In recent years, porous anodic alumina, which is characterized by fine, regular, almost cylindrical and parallel pores, has attracted an increasing interest [1][2][3][4][5][6][7][8]. The fabrication of nanometer-sized fine structures has attracted many attentions because of their potential utilization in magnetic [9], electronic [10], optoelectronic devices [11] and sensors [12].…”