Synthesis of PbTiO3Nanotubes by Metalorganic Chemical Vapor Deposition

We report on the synthesis of PbTiO 3 nanotubes by metalorganic chemical vapor deposition (MOCVD). Single-crystal ZnO nanorods grown on SiO 2 /Si by a self-assembly process using MOCVD were used as a positive template. Subsequently, the ZnO nanorods were uniformly covered with PbTiO 3 by MOCVD. Then, ZnO was etched away using HCl and PbTiO 3 nanotubes were obtained. The diameters and wall thicknesses of typical PbTiO 3 nanotubes were 100–250 and 40–100 nm, respectively. Ferroelectricity in the PbTiO 3 nanotubes was confirmed by piezoresponse force microscopy, which also revealed that PbTiO 3 nanotubes exhibited large effective piezoelectric coefficients of 150–200 pm/V and a large electrically induced strain of ∼0.8% of the diameter.