Formation of hybrid monolayers and Langmuir-Blodgett-type multilayers from ammonium cations and TiO2 crystalline nanosheets

T. Yamaki, R. Shinohara, K. Asai

Research output: Contribution to journalConference article

9 Citations (Scopus)

Abstract

A novel hybrid monolayer composed of ammonium cations and TiO2 crystalline nanosheets was formed at an air-water interface. We employed, as the subphase under the monolayer, stable colloidal suspensions obtained by exfoliating a lepidocrocite-type layered titanate, HxTi2-x/4x/4O4· H2O (x ∼ 0.7; □, vacancy) into elementary host layers. Surface pressure-area isotherms demonstrated that spreading molecules of dioctadecyldimethylammonium bromide (DODAB) on the suspensions resulted in complexation of DODAB with the exfoliated single layers of quasi-TiO2. The hybrid monolayer was quantitatively transferred onto solid substrates by the Langmuir-Blodgett (LB) technique to form a multilayer film. UV-Visible absorption spectra and X-ray diffraction measurements confirmed that the film possessed a DODAB/TiO2 alternating structure with a repeating unit of 3.4 nm.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalThin Solid Films
Volume393
Issue number1-2
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes
Event4th International Conference on Nano-Molecular Electronics - Kobe, Japan
Duration: 2000 Dec 52000 Dec 7

Keywords

  • Langmuir-Blodgett films (LB films)
  • Monolayers
  • Multilayers
  • Nanostructures
  • Quantum effects
  • Titanium oxide

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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