ZnO/Al2O3 core-shell nanorod arrays: Growth, structural characterization, and luminescent properties

C. Y. Chen, C. A. Lin, M. J. Chen, G. R. Lin, Jr-Hau He

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

We report an aqueous chemical method to fabricate well-aligned ZnO/Al 2O3 nanocrystal (NC) core-shell nanorod arrays (NRAs). Structural characterization showed that the shell layers are composed of α- Al2O3 nanocrystals. Photoluminescence measurements showed the enhancement of near-band-edge (NBE) emission of ZnO NRAs due to the presence of Al2O3 NC shells. The Al 2O3 NC shell layer resulting in the flat-band effect near the ZnO surface leads to a stronger overlap of the wavefunctions of electrons and holes in the ZnO core, further enhancing the NBE emission. This approach should be very useful in designing many other core-shell NRAs for creating varieties of high-efficiency optoelectronic devices.

Original languageEnglish (US)
Article number185605
JournalNanotechnology
Volume20
Issue number18
DOIs
StatePublished - May 20 2009

ASJC Scopus subject areas

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

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