Improvement of optical properties of post-annealed ZnO nanorods

Juneyoung Lee, Jooyoung Chung, Sangwoo Lim

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63 Citations (Scopus)

Abstract

Well aligned zinc oxide (ZnO) nanorods were synthesized on a Si substrate with a hydrothermal method. The effects of annealing on the optical properties of ZnO nanorods were examined by annealing samples in oxygen or forming gas (H2:N2=1:9). The optical properties of the ZnO nanorods were investigated using room temperature photoluminescence (PL) measurement, which revealed two emission bands. After each annealing, the intensity of ultraviolet (UV) emission increased, while the intensity of visible emission decreased. The reason for the increase in the ratio of UV to visible emission, IUV/IDLE, of ZnO nanorods annealed in oxygen or forming gas is attributed to the reduction in the concentration of the oxygen defects and to the less OH groups on the ZnO nanorod surface. Effects of crystal size, diameter, and chemisorbed oxygen were precluded.

Original languageEnglish
Pages (from-to)2143-2146
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number8
DOIs
Publication statusPublished - 2010 Jun

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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