H. Saijo et M. Shiojiri, J-AGGREGATES OF CYANINE DYE MOLECULES ADSORBED ON AGBR EMULSION CRYSTAL-SURFACES, Journal of crystal growth, 166(1-4), 1996, pp. 930-934
The photosensitive dyes thiacarbocyanine and oxacarbocyanine on 0.7 mu
m AgBr cubic crystals are observed by analytical-color-fluorescence e
lectron microscopy (ACFEM), ultra-low-energy scanning electron microsc
opy (SEM), and atomic force microscopy (AFM). ACFEM proves that the dy
e makes J-aggregates, exhibiting cathodoluminescence spots about 30 x
70 nm. SEM reveals dye stripes epitaxially grown on the (001) AgBr sur
face. AFM gives the thickness of the stripes, varying from 1 to 20 nm
or more, and resolves single J-aggregate particles arranged in the str
ipe. It is concluded that the dye forms in the stripes by island growt
h rather than in monolayer adsorption.