Get access

Electrically Addressable Hybrid Architectures of Zinc Oxide Nanowires Grown on Aligned Carbon Nanotubes

Authors

  • Jong G. Ok,

    1. Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author
  • Sameh H. Tawfick,

    1. Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author
  • K. Anne Juggernauth,

    1. Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    2. Macromolecular Science and Engineering Research Center Department of Materials Science and Engineering, University of Michigan 2455 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author
  • Kai Sun,

    1. Electron Microbeam Analysis Laboratory Department of Materials Science and Engineering, University of Michigan 2455 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author
  • Yongyi Zhang,

    1. Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author
  • A. John Hart

    Corresponding author
    1. Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    • Mechanosynthesis Group Department of Mechanical Engineering, University of Michigan 2350 Hayward Street, Ann Arbor, MI 48109 (USA)
    Search for more papers by this author

Abstract

The fabrication and characterization of hybrid architectures of ZnO nanowires (ZNWs) grown on organized carbon nanotubes (CNTs), by a two-step chemical vapor deposition (CVD) process involving CNT growth from a hydrocarbon source followed by ZNW growth using a Zn metal source, is reported. The ZNWs grow uniformly and radially from individual CNTs and CNT bundles, and the aligned morphology of the CNTs is not disturbed by the ZNW growth process. The nucleation and growth of ZnO crystals on CNTs are analyzed in relation to the classical vapor–solid mechanism. Importantly, the CNTs make uniform and distributed electrical contact to the ZNWs, with up to a 1000-fold yield advantage over conventional ZNW growth on a flat substrate. Hybrid ZNW/CNT sheets are fabricated by scalable CVD, rolling, and printing methods; and their electrical properties, which are governed by transport through the anisotropic CNT network, are characterized. Functional interaction between the ZNWs and CNTs is demonstrated by photoconductive behavior and photocurrent generation of the hybrid material under UV illumination. There is significant future opportunity to extend these processing methods to fabricate other functional oxides on CNTs, and to build devices that harness the attractive properties of ZNWs and CNTs with high volumetric efficiency over large areas.

Get access to the full text of this article

Ancillary