In Situ Investigation of the Early-Stage Growth of Nanoporous Alumina

Figure 8

Samples anodized at 40 V using oxalic acid (3 wt%) with pretextured sample. (a) Cross section along direction from the scattering rod. The inset shows the corresponding SEM cross section with the schematically representation of the electrical field lines. (b) Porous layer thickness measured from the Kiessig fringes at the early stages of formation. The comparison from SEM observation (cross symbol) is reported for an ex situ sample at longer anodization time. The linear regression equation is

(a)

(b)