Abstract
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 language | English |
|---|---|
| Pages (from-to) | 752-761 |
| Number of pages | 10 |
| Journal | KOBUNSHI RONBUNSHU |
| Volume | 60 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2003 Dec |
Keywords
- 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