Fabrication of nanoporous MTiO3 (M = Pb, Ba, Sr) perovskite array films with unprecedented high structural regularity

Abstract

Nanoporous MTiO3 (M = Pb, Ba, Sr) array films with unprecedented high structural regularity are fabricated on Ti substrate by hydrothermal treatment of anodic TiO2 film prepared by two-step anodization. The films contain a high density of uniform cylindrical pores that are aligned perpendicular to the Ti substrate. One-step anodization, however, produces individually-separated nanotubes.