A Novel Method for Fabricating Double Layers Porous Anodic Alumina in Phosphoric/Oxalic Acid Solution and Oxalic Acid Solution

Table 1

Structure parameters of small pore layer formed by three-step anodization.

Potential (V)	Interpore distance (nm)	Oxide thickness (m)	Pore density measured (10^9/cm^−2)	Pore density theoretical (10^9/cm^−2)
60	142	1.24	4.89	5.64
70	158	2.63	3.86	4.45
80	181	5.46	3.03	3.52
90	204	14.08	2.42	2.79
100	241	26.23	1.94	2.16