J-AGGREGATES OF CYANINE DYE MOLECULES ADSORBED ON THE SURFACES OF AGBR EMULSION CRYSTALS

Photosensitive thiacarbocyanine dye adsorbed on practical photographic emulsion AgBr microcrystals has been visualized by ultra-low energy s canning electron microscopy at room temperature. The dye is observed i n stripes along the [210] and/or [120] direction on the AgBr (001) sur face, which indicates that the dye molecules nucleate and grow with a certain epitaxial relation in respect with the AgBr lattice. The strip es become to a patch with increasing surface coverage. Using atomic fo rce microscopy the stripes or patches are found to be not always monol ayer. It is concluded by taking account of results of analytical color fluorescence electron microscopy that they are constructed with photo electrically separated J-aggregate particles.