Langmuir-Blodgett films composed of size-quantized ZnO nanoparticles: Fabrication and optical characterization

Lívia Naszályi, András Deák, Elizabeth Hild, André Ayral, Attila L. Kovács, Z. Hórvölgyi

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

ZnO alcosols were synthesized by wet colloid chemical route. The particle diameters were found to be in the range of 3-6 nm studied by small angle X-ray scattering, transmission electron microscopy and UV-Vis spectroscopy. Mono- and multilayered films were prepared by Langmuir-Blodgett (LB) technique on fused silica and silicon supports. The films were studied by UV-Vis spectroscopy and scanning angle reflectometry (SAR). The experimentally determined optical band gap values (3.48-3.70 eV) revealed size-quantized ZnO particles in the LB films. After annealing the multilayers at 400 °C for 3 h, a nearly bulk-type semiconductor behaviour of particles was found (3.35-3.33 eV). SAR examinations, however, showed significant porosity (0.493) for the annealed films.

Original languageEnglish
Pages (from-to)2587-2595
Number of pages9
JournalThin Solid Films
Volume515
Issue number4
DOIs
Publication statusPublished - Dec 5 2006

Keywords

  • Langmuir-Blodgett (LB) films
  • Nanostructures
  • Optical properties
  • Zinc oxide nanoparticles

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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