Influence of reactant concentration on optical properties of ZnO nanoparticles

S. Dagher, A. I. Ayesh, N. Tit, Yousef Haik

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Zinc oxide (ZnO) nanoparticles have been prepared by wet chemical method from zinc acetate. Particle size was controlled by adjusting the reactant concentration. The size of nanoparticles was investigated using ultraviolet-visible absorption spectra and photoluminescence spectra. The present nanoparticles exhibit non-linear optical behaviour with blue shift of the wavelengths as the particle size decreases. Furthermore, yellow emission is observed in ambient air while it disappears in the presence of nitrogen gas and gets substituted by blue violet emissions. While the blue violet emissions are familiar and likely to be attributed to electronic transitions from localised states (e.g. shallow donor states on Zn interstitials 'Zni') or the conduction band edge to the valence band, the yellow emission in the absence of nitrogen remains unclear. Our results of the present investigation suggest that the bubbling with nitrogen should fill the oxygen vacancies, substitute the oxygen interstitials, passivate the dangling bonds and introduce shallow acceptor states, which allow electronic transitions with shorter wavelengths (i.e. blue violet emissions). In the absence of nitrogen, surface defects such as oxygen interstitials and Zn(OH)2 and possibly other point defects become again active and induce deep acceptor states of ~1 eV above the valence band edge, which allow electronic transitions of longer wavelength (i.e. yellow emission). Our results are compared to several available experimental data and first principle calculations in order to support our claims and conclusions.

Original languageEnglish
Pages (from-to)76-82
Number of pages7
JournalMaterials Technology
Volume29
Issue number2
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Fingerprint

Zinc Oxide
Zinc oxide
zinc oxides
Nitrogen
Optical properties
Nanoparticles
optical properties
nanoparticles
Valence bands
Wavelength
nitrogen
interstitials
Zinc Acetate
Particle size
Oxygen
Dangling bonds
Surface defects
oxygen
Point defects
Oxygen vacancies

Keywords

  • Absorption
  • Emission spectra
  • Nanoparticles
  • Optical properties
  • ZnO

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Influence of reactant concentration on optical properties of ZnO nanoparticles. / Dagher, S.; Ayesh, A. I.; Tit, N.; Haik, Yousef.

In: Materials Technology, Vol. 29, No. 2, 03.2014, p. 76-82.

Research output: Contribution to journalArticle

Dagher, S. ; Ayesh, A. I. ; Tit, N. ; Haik, Yousef. / Influence of reactant concentration on optical properties of ZnO nanoparticles. In: Materials Technology. 2014 ; Vol. 29, No. 2. pp. 76-82.
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