Defects in ZnO nanorods prepared by a hydrothermal method

K. H. Tam, C. K. Cheung, Y. H. Leung, A. B. Djurišić, C. C. Ling, C. D. Beling, S. Fung, Wai Ming Kwok, W. K. Chan, D. L. Phillips, L. Ding, W. K. Ge

Research output: Journal article publicationJournal articleAcademic researchpeer-review

671 Citations (Scopus)

Abstract

ZnO nanorod arrays were fabricated using a hydrothermal method. The nanorods were studied by scanning electron microscopy, photoluminescence (PL), time-resolved PL, X-ray photoelectron spectroscopy, and positron annihilation spectroscopy before and after annealing in different environments and at different temperatures. Annealing atmosphere and temperature had significant effects on the PL spectrum, while in all cases the positron diffusion length and PL decay times were increased. We found that, while the defect emission can be significantly reduced by annealing at 200°C, the rods still have large defect concentrations as confirmed by their low positron diffusion length and short PL decay time constants.
Original languageEnglish
Pages (from-to)20865-20871
Number of pages7
JournalJournal of Physical Chemistry B
Volume110
Issue number42
DOIs
Publication statusPublished - 26 Oct 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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