Formation of Multiple Layers of Sensitizing Dyes on a Silver Halide Grain by Intermolecular Forces

Abstract

Formation of multiple layers of sensitizing dyes on a silver halide grain was studied from the viewpoint of intermolecular forces among them. We found it possible to form multiple cyanine-dye layers on a silver halide grain by enhancing such intermolecular forces as electrostatic, hydrophobic, and van der Waal s ones between the primary and secondary adsorbed dye layers. The secondary adsorbed dye layer significantly increased spectral sensitivity in the wavelength region of the light, which it absorbed. The fluorescence of these dyes revealed that the energy transfer took place from the secondary layer to the primary one.