Lanthanum-substituted bismuth titanate nanotubes

Ferroelectric (Bi1−xLax)4Ti3O12 (BLT) nanotubes doped with 0.85 at% La were fabricated with the aim of developing an alternative to conventional technologies. A technique based on the wetting of a polymeric metal-organic source was used in the fabrication process for ferroelectric nanotubes. This technique involved the use of porous alumina produced by anodic aluminum oxidation as a template. It was demonstrated that these nanotubes can be used for the large-scale fabrication. X-ray diffraction measurements and transmission electron microscopy studies show that the crystal grains in the BLT nanotubes with a wall thickness of approximately 20 nm have a ferroelectric BLT phase with a random orientation and a grain diameter of 10 nm to 60 nm. Promising electrical properties of the BLT nanotubes for electronic devices could be confirmed in I–V measurements. The measured leakage current for a BLT nanotube with a length of approximately 2.5 μm at an applied voltage of 2 V was approximately 2.5×10–11 A.

This study demonstrates simple method for fabrication of lanthanum-substituted bismuth titanate nanotubes via template-wetting technique. Detailed TEM and I–V characteristics show well formed ferroelectric nanotubes. Figure optionsDownload as PowerPoint slideHighlights
► BLT ferroelectric nanotubes have been fabricated by template-wetting technique.
► Anodically oxidized porous aluminum (AAO) has been used as a host temple.
► Single nanotubes can be obtained by removing the AAO.
► Detailed TEM and electrical analysis of the single BLT nanotube has been demonstrated.