Wf. Zhao et al., THE INFLUENCE OF STRUCTURES OF SENSITIZING DYES ON THEIR ADSORPTION AND SIZE DISTRIBUTION OF J-AGGREGATES ON AGBR GRAIN BY ACFEM, Journal of imaging science and technology, 42(2), 1998, pp. 144-147
The effects of different substituents on thiacarbocyanine and indocarb
ocyanine dyes on their adsorption to AgBr microcrystals and on size di
stributions of J-aggregates were investigated by analytical color fluo
rescence electron microscopy (ACFEM). The results showed that the adso
rbability of the indocarbocyanine iodide dye on cubic AgBr grains was
greater than that on the T-grain AgBr. On the other hand, adsorbabilit
y of the thiacarbocyanine triethyl ammonium salt on the T-grain AgBr w
as greater than on the cubic AgBr. In addition, adsorbabilities of 5-s
ubstituted thiacarbocyanine dyes either on T-grain or on cubic AgBr we
re much greater than those of 5-unsubstituted thiacarbocyanine dyes. W
e inferred that growth of J-aggregates on AgBr could be regarded as Os
twald ripening, and that substitution of the indocarbocyanine with an
N-ethyl substituent led to strong J-aggregation. The average size of J
-aggregates of 5-substituted thiacarbocyanine dyes formed on cubic AgB
r were larger than the average size of J-aggregates of the 5-unsubstit
uted.