PbTiO₃- and Pb(Zr,Ti)O₃-Covered ZnO Nanorods

We report on the synthesis of PbTiO 3 - and Pb(Zr,Ti)O 3 (PZT)-covered ZnO nanorods by metalorganic chemical vapor deposition (MOCVD) and their piezoelectric properties. Single-crystal ZnO nanorods with diameters of 140–230 nm and lengths of ∼13 µm were grown on SiO 2 /Si by a self-assembly process using MOCVD. Subsequently, polycrystalline PbTiO 3 and PZT were also deposited on the ZnO nanorods by MOCVD. Scanning and transmission electron microscopy revealed that PbTiO 3 and PZT uniformly covered the ZnO nanorods with aspect ratios above 50. Piezoelectric force microscopy revealed that PbTiO 3 - and PZT-covered ZnO nanorods showed a piezoresponse of 50–100 pm/V.