Modified hard anodization procedure to fabricate hybrid nanoporous alumina

In this work we present an innovative approach to fabricate new structures based on nanoporous alumina. The fabrication process is carried out following a modified two-step hard anodization process in a 0.3 M oxalic acid solution at 120 V and 0degC. The nanoporous anodic alumina membranes present a hybrid pore structure which consist of pores with short diameters inner pores with longer diameters. This new nanostructure could be used to develop new chemical or biological sensors or to fabricate optoelectronic and storage devices.