Structural changes in molecular assemblies in Langmuir-Blodgett films induced by ionizing radiation

K. Asai, T. Watanabe, D. Hiroishi, T. Sato, K. Ishigure

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Cyanine dye (S120) aggregated into a specific state, a J-aggregate, in monolayer assemblies was irradiated with γ-rays at room temperature and the structural changes induced thereby were investigated. We prepared samples with control of the fractions of the J-aggregates in a texture through the Langmuir-Blodgett method. Changes in the assembly structure on irradiation were analyzed by absorption spectra by separately estimating the concentration of the J-aggregates and the "non-J" part, which practically consists of monomers. As a result, it became apparent that the efficiency of dissociation of S120 was highly influenced by differences in the molecular ordering structure. We proposed a model describing the radiation-induced changes in the molecular concentrations in the J-aggregates and the non-J to explain the experimental data.

Original languageEnglish
Pages (from-to)124-129
Number of pages6
JournalThin Solid Films
Issue number1-2
Publication statusPublished - 1996 Sep 1
Externally publishedYes


  • Fluorescence
  • Langmuir-Blodgett films
  • Radiation damage
  • Surface morphology

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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