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Phys. Rev. B 74, 035434 (2006) [6 pages]

Elasticity and piezoelectricity of zinc oxide crystals, single layers, and possible single-walled nanotubes

Z. C. Tu and X. Hu
Computational Materials Science Center, National Institute for Materials Science, Tsukuba 305-0047, Japan
Received 22 November 2005; revised 19 April 2006; published 28 July 2006

The elasticity and piezoelectricity of zinc oxide (ZnO) crystals and single layers are investigated from the first-principles calculations. It is found that a ZnO thin film less than three Zn-O layers prefers a planar graphitelike structure to the wurtzite structure. ZnO single layers are much more flexible than graphite single layers in the elasticity and stronger than boron nitride single layers in the piezoelectricity. Single-walled ZnO nanotubes (SWZONTs) can exist in principle because of their negative binding energy. The piezoelectricity of SWZONTs depends on their chirality. For most ZnO nanotubes except the zigzag type, twists around the tube axis will induce axial polarizations. A possible scheme is proposed to achieve the SWZONTs from the solid-vapor phase process with carbon nanotubes as templates.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.74.035434
DOI: 10.1103/PhysRevB.74.035434
PACS: 62.25.+g; 62.20.Dc; 77.65.-j
  • 62.25.+g
    Mechanical properties of nanoscale materials
  • 62.20.Dc
    Elasticity, elastic constants
  • 77.65.-j
    Piezoelectricity and electromechanical effects
  • YEAR: 2006
KEYWORDS: elasticity, piezoelectricity, zinc compounds, nanotubes, II-VI semiconductors, wide band gap semiconductors, ab initio calculations, piezoelectric materials, binding energy

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