Polyelectrolyte/magnetite nanoparticle multilayers: Preparation and structure characterization

D. Grigoriev, D. Gorin, G. B. Sukhorukov, A. Yashchenok, E. Maltseva, H. Möhwald

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Abstract

Polyelectrolyte composite planar films containing a different number of iron oxide (Fe3O4) nanoparticle layers have been prepared using the layer-by-layer adsorption technique. The nanocomposite assemblies were characterized by ellipsometry, UV - vis spectroscopy, and AFM. Linear growth of the multilayer thickness with the increase of the layer number, N, up to 12 reflects an extensive character of this parameter in this range. A more complicated behavior of the refractive index is caused by changes in the multilayer structure, especially for the thicker nanocomposites. A quantitative analysis of the nanocomposite structure is provided comparing a classical and a modified effective medium approach taking into account the influence of light absorption by the Fe3O4 nanoparticles on the complex refractive index of the nanocomposite and contributions of all components to film thickness. Dominant influence of co-adsorbed water on their properties was found to be another interesting peculiarity of the nanocomposite film. This effect, as well as possible film property modulation by light, is discussed.

Original languageEnglish
Pages (from-to)12388-12396
Number of pages9
JournalLangmuir
Volume23
Issue number24
DOIs
Publication statusPublished - 20 Nov 2007
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Grigoriev, D., Gorin, D., Sukhorukov, G. B., Yashchenok, A., Maltseva, E., & Möhwald, H. (2007). Polyelectrolyte/magnetite nanoparticle multilayers: Preparation and structure characterization. Langmuir, 23(24), 12388-12396. https://doi.org/10.1021/la700963h