“…A variety of methods have been already used for the fabrication of nanostructured semiconductor oxides including thermal evaporation [6,7], template assisted methods [8], solution-based synthesis [9], electrospinning [10] and others. On the other hand, it is well known that simple anodic oxidation (anodization) can be successfully adopted for the fabrication of nanostructured oxide layers on the surface of various metals, such as: Al, Ti, Nb, Hf, W, V, Zr, Cr, Fe, Ni, Zn [11][12][13][14] or even Au [15,16].…”