Optical properties of zinc peroxide and zinc oxide multilayer nanohybrid films

Dániel Sebok, T. Szabó, I. Dékány

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Zinc peroxide and zinc oxide nanoparticles were prepared and self-assembled hybrid nanolayers were built up using layer-by-layer (LbL) technique on the surface of glass substrate using the layer silicate hectorite and an anionic polyelectrolyte, sodium polystyrene sulfonate (PSS). Light absorption, interference and morphological properties of the hybrid films were studied to determine their thickness and refractive index. The influence of layer silicates and polymers on the self-organizing properties of ZnO2 and ZnO nanoparticles was examined. X-ray diffraction revealed that ZnO2 powders decomposed to ZnO (zincite phase) at relatively low temperatures (less than 200 °C). The optical thickness of the films ranged from 190 to 750 nm and increased linearly with the number of layers. Band gap energies of the ZnO2/hectorite films were independent from the layer thickness and were larger than that of pure ZnO2 nanodispersion. Decomposition of ZnO2 to ZnO and O2 at 400 °C resulted in the decrease of the band gap energy from 3.75 to 3.3 eV. Concomitantly, the refractive index increased in correlation with the formation of the zincite ZnO phase. In contrast, the band gap energies of the ZnO2/PSS hybrid films decreased with the thickness of the nanohybrid layers. We ascribe this phenomenon to the steric stabilization of primary ZnO2 particles present in the confined space between adjacent layers of hectorite sheets.

Original languageEnglish
Pages (from-to)6953-6962
Number of pages10
JournalApplied Surface Science
Volume255
Issue number15
DOIs
Publication statusPublished - May 15 2009

Fingerprint

Zinc Oxide
Multilayer films
Peroxides
Zinc oxide
Oxide films
Zinc
Optical properties
Silicates
Energy gap
Polystyrenes
Refractive index
Nanoparticles
Polyelectrolytes
Powders
Light absorption
Polymers
Stabilization
Sodium
Decomposition
X ray diffraction

Keywords

  • Band gap energy
  • Optical interference
  • Optical properties
  • Self-assembly
  • ZnO nanohybrid films
  • ZnO nanoparticles

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Optical properties of zinc peroxide and zinc oxide multilayer nanohybrid films. / Sebok, Dániel; Szabó, T.; Dékány, I.

In: Applied Surface Science, Vol. 255, No. 15, 15.05.2009, p. 6953-6962.

Research output: Contribution to journalArticle

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