Growth and field-emission properties of single-crystalline conic ZnO nanotubes

Ruey Chi Wang, Chuan-Pu Liu, Jow-Lay Huang, Shu Jen Chen

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Single-crystalline conic ZnO nanotubes were synthesized on Si(001) without catalysts by thermal chemical vapour deposition at 475 °C. The nanotubes grown along the ZnO [0001] direction are sharp open-ended tips consisting of planar defects revealed by transmission electron microscopy and scanning electron microscopy. The nanotubes were formed by self-assembly of numerous six-radiated branches of hexagram nanosheets. The diameters and the wall thicknesses of the nanotubes are in the ranges 30-100 and 15-30 nm, respectively. The lengths and areal densities of the nanotubes are around 0.5 νm and 1-9 × 10 8 cm -2 , respectively. Field-emission measurements on the conic nanotubes show a low turn-on field of 3.5 V νm -1 at 10 νA cm -2 . The field-emission properties related to the nanotube density and geometry and the nonlinearity in the Fowler-Nordheim (FN) plot at lower field region are discussed.

Original languageEnglish
Pages (from-to)753-757
Number of pages5
Issue number3
Publication statusPublished - 2006 Feb 14

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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