Synthesis of thin films of barium titanate and barium strontium titanate nanotubes on titanium substrates

In this study, well-ordered nanotubes of titania were fabricated by anodic oxidation of pure titanium foils in HF aqueous solution. Fe-SEM images indicate the average nanotubes diameter is similar to 100 nm with a thickness of about 200 nm. Nanotube arrays of barium titanate and barium strontium titanate were synthesized under hydrothermal condition at 200 degrees C taking above-oxidized titania nanotubes as templates. In contrast to porous alumina membranes obtained by others using similar approaches, a different morphology was obtained in the current study. The nanotube arrays of barium titanate and barium strontium titanate may have many potential applications in microelectronics. (c) 2005 Elsevier B.V. All rights reserved.