Hierarchi structure of cyanine dyes J-aggregate in polymer microdomes

Kazuaki Kaga, Kiyoshi Okamoto, Takahiro Echizen, Olaf Karthaus, Ken Nakajima

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)


    The hierarchic structure and fluorescence behavior of cyanine dyes in μm-sized polystyrene droplets or domes on mica substrate were investigated. The samples were prepared by moving a glass roller connected to a digital motor after casting a dilute polystyrene/dyes solution in the space between substrate and glass roller. A de-wetting process leads to the formation of cyanine dye J-aggregates in small polymer domes arrayed in two dimensions with a diameter of 1 ∼ 100 μm and a height of 20 nm to several μm. Fluorescence micrographs show that dye aggregates formed in the surroundings of the domes at a certain dye concentration. This means that the dye aggregate structure from the molecular level to the micro level is formed by self-organization. The fluorescence spectra of J-aggregate showed a red-shift with increasing concentration. By comparison of different domes, a size effect of the fluorescence spectra was observed.

    Original languageEnglish
    Pages (from-to)752-761
    Number of pages10
    Issue number12
    Publication statusPublished - 2003 Dec


    • Dewetting
    • Flourescence spectra
    • Hierarchic structure
    • J-aggregates
    • Size effect

    ASJC Scopus subject areas

    • Chemical Engineering (miscellaneous)
    • Materials Science (miscellaneous)
    • Environmental Science(all)
    • Polymers and Plastics


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