Highly uniform epitaxial ZnO nanorod arrays for nanopiezotronics

J. Volk, T. Nagata, R. Erdélyi, I. Bársony, A. L. Tóth, I. E. Lukács, Zs Czigány, H. Tomimoto, Y. Shingaya, T. Chikyow

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46 Citations (Scopus)

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 μm. 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).

Original languageEnglish
Pages (from-to)699-704
Number of pages6
JournalNanoscale Research Letters
Volume4
Issue number7
DOIs
Publication statusPublished - 2009 Jul

Keywords

  • Aqueous chemical growth
  • NEMS
  • Nanogenerator
  • Piezoelectricity
  • Rod-type photonic crystal
  • Vertical nanowire

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Volk, J., Nagata, T., Erdélyi, R., Bársony, I., Tóth, A. L., Lukács, I. E., Czigány, Z., Tomimoto, H., Shingaya, Y., & Chikyow, T. (2009). Highly uniform epitaxial ZnO nanorod arrays for nanopiezotronics. Nanoscale Research Letters, 4(7), 699-704. https://doi.org/10.1007/s11671-009-9302-1