Fabrication of a Vertically Aligned Ferroelectric Perovskite Nanowire Array on Conducting Substrate

• Published in: Chemistry of materials 2010-08, Vol.22 (16), p.4806-4813
• Main Authors: Im, Badro, Jun, Hwichan, Lee, Kyung Hee, Lee, Sung-Ho, Yang, Il Kyu, Jeong, Yoon Hee, Lee, Jae Sung
• Format: Article
• Language: English
• Subjects: Inorganic Solids and Ceramics; Nanomaterials (Nanops, Nanotubes, etc.); Sol−Gel Chemistry/Processing
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm101412d

A new fabrication process of a vertically aligned ferroelectric perovskite PbTiO3 nanowire array on Ti substrate is presented. Polycrystalline TiO2 nanotubes are first fabricated by anodic oxidation of Ti foil and then treated hydrothermally in a lead acetate solution to obtain single-crystalline nanowires. This nanotube-to-nanowire transformation on conducting substrate could be described by a swelling-and-rupture mechanism, in which individually well-developed nanotubes are swollen and broken along the friction planes because of difference in the directions of expansion force. Nanowires with a uniform diameter of ca. 40 nm and a length of 10 μm show single-crystalline nature over the entire length of nanowires and ultrahigh density corresponding to ca. 0.22 Tb inch−2. The ferroelectric property of individual PbTiO3 nanowires and whole area of nanowire arrays has been demonstrated by piezo-response force microscopy.