Field emission properties of gold nanoparticle-decorated ZnO nanopillars

Yuan Ming Chang*, Man Ling Lin, Tung Yen Lai, Hsin Yi Lee, Chih Ming Lin, Yew-Chuhg Wu, Jenh-Yih Juang

*Corresponding author for this work

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

The structural and optoelectronic properties of ZnO nanopillars (ZnO-NPs) grown on Si substrates by the vapor transport deposition method were investigated. In particular, by varying the deposition duration and hence the morphology of the vertically aligned ZnO-NPs, the resultant field emission characteristics were systematically compared. In addition to identifying the advantageous field emission properties exhibited in the pencil-like ZnO-NPs, we observed that by adhering Au nanoparticles on the surface of the ZnO-NPs the turn-on field and the maximum current density can be drastically improved from 3.15 V/μm and 0.44 mA/cm2 at 5 V/μm for the best ZnO-NPs to 2.65 V/μm and 2.11 mA/cm2 at 5 V/μm for Au/ZnO-NPs, respectively. The enhancement of field emission characteristics that resulted from Au-nanoparticle decoration is discussed on the basis of charge-transfer-induced band structure modifications.

Original languageEnglish
Pages (from-to)6676-6682
Number of pages7
JournalACS Applied Materials and Interfaces
Volume4
Issue number12
DOIs
StatePublished - 26 Dec 2012

Keywords

  • Au nanoparticles
  • ZnO nanopillars
  • current density
  • field emission
  • turn-on field
  • vapor transport deposition

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