title: Highly Uniform Epitaxial ZnO Nanorod Arrays for Nanopiezotronics.
abstract: Highly uniform and c-axis-aligned ZnO nanorod arrays were fabricated in predefined patterns by a low temperature homoepitaxial aqueous chemical method. The nucleation seed patterns were realized in polymer and in metal thin films, resulting in, all-ZnO and bottom-contacted structures, respectively. Both of them show excellent geometrical uniformity: the cross-sectional uniformity according to the scanning electron micrographs across the array is lower than 2%. The diameter of the hexagonal prism-shaped nanorods can be set in the range of 90-170 nm while their typical length achievable is 0.5-2.3 mum. The effect of the surface polarity was also examined, however, no significant difference was found between the arrays grown on Zn-terminated and on O-terminated face of the ZnO single crystal. The transmission electron microscopy observation revealed the single crystalline nature of the nanorods. The current-voltage characteristics taken on an individual nanorod contacted by a Au-coated atomic force microscope tip reflected Schottky-type behavior. The geometrical uniformity, the designable pattern, and the electrical properties make the presented nanorod arrays ideal candidates to be used in ZnO-based DC nanogenerator and in next-generation integrated piezoelectric nano-electromechanical systems (NEMS).
authors.forename: J
authors.initials: J
authors.lastname: Volk
authors.forename: T
authors.initials: T
authors.lastname: Nagata
authors.forename: R
authors.initials: R
authors.lastname: Erdélyi
authors.forename: I
authors.initials: I
authors.lastname: Bársony
authors.forename: A L
authors.initials: AL
authors.lastname: Tóth
authors.forename: I E
authors.initials: IE
authors.lastname: Lukács
authors.forename: Zs
authors.initials: Z
authors.lastname: Czigány
authors.forename: H
authors.initials: H
authors.lastname: Tomimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Shingaya
authors.forename: T
authors.initials: T
authors.lastname: Chikyow