Enhanced density control of ai:Zno nanowires via one-by-one coupling of nanowires and pyramids

Chien Lin Kuo, Yu Han Liang, Jun Hang Huang, Ruey Chi Wang, Jow Lay Huang, Hong Ren Chang, Chuan Pu Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Al doped ZnO nanowire arrays with controlled growth densities were fabricated on silicon without using catalysts via sputtering followed by thermal chemical vapor deposition (CVD). Scanning electron microscopy and high-resolution transmission electron microscopy results show that the AhZnO single-crystalline nanowires synthesized by CVD prefer growing epitaxially on the tips of the ZnO pyramids pre-synthesized by sputtering with the c-axis perpendicular to the substrate. Consequently, the densities of the as-grown AhZnO nanowires were controllable by changing the particle densities of the pre-grown ZnO seed layers. The Al concentration of the AhZnO nanowires were measured to be around 2.63 at.% by electron energy loss spectrum. Field-emission measurements show the turn-on fields of the AI:ZnO nanowire arrays with controllable area densities are tunable. Room-temperature cathodoluminescence spectra of the AI:ZnO nanowires show relatively strong and sharp ultraviolet emissions centered at 383 nm and broad green emissions at around 497 nm. This work provides a simple method to control the field emission and luminescence densities of Al doped ZnO nanowire arrays, which also shows good potential for developing nano-pixel optical devices.

Original languageEnglish
Pages (from-to)893-897
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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