ZrNT were fabricated and structurally characterized using SEM and images obtained showing their Electrochemical anodization of Zirconium in a fluoride-containing electrolyte initially consists of the formation of a compact-oxide barrier which undergoes a time-dependent dissolution, mediated by the formation of a soluble zirconium fluoro-complex that allows for porosification. These pores, then serve as nucleation spots, subsequently facilitating anodic oxide growth. When an equilibrium state, is established between the rate of oxidation and dissolution, stable nanotubular arrays are observed.[ ]. The anodization voltage is an important parameter that influences tube dimensions, such that, as reported previously, the diameter increases with voltage and under a constant voltage regime the diameter remains unchanged as also shown in fig . This concept of a steady-state anodic growth at a constant potential that allows for a constant diameter was explored to fabricate a double layer with different diameters. Herein, by varying the voltage incrementally results in localized electric field perturbations which originate a change in the dissolution kinetics. This subsequently creates new pores and the increase in current density promotes pore growth, thereby resulting in the formation of larger diameter. Therefore by initiating nanotube formation at 20V for 4 hours and thereafter increasing the voltage to 90V for 2 hours, we were able to successfully fabricate a double layered ZrNT with a modulated diameter. Furthermore, the length of the layers was controlled by altering the anodization time for each voltage regime, the length of the first layer for various applications[ ], and herein, we report on a successful transposition of double layered modulated anodic structures for the first time onto the valve metal, Zirconium.