K. Seki et al., SPECTRAL SENSITIZATION, INTERFACIAL ELECTRONIC-STRUCTURE, AND ADSORPTION GEOMETRY AT MEROCYANINE DYE SILVER-HALIDE INTERFACES, Journal of imaging science and technology, 37(6), 1993, pp. 589-597
Interfaces between merocyanine dyes and silver halides were investigat
ed by a combination of various techniques for discussing the mechanism
of spectral sensitization. The electronic structures were directly de
termined for dye/AgBr interfaces by UV photoemission spectroscopy and
diffuse reflectance spectroscopy. The observed electronic structures s
howed excellent correlation with observed sensitizing behavior of dyes
. The adsorption geometries of dyes were estimated by studying Langmui
r isotherms and x-ray absorption near-edge structure spectra at the K
edge of sulfur for dye/AgCl systems, directly demonstrating that dyes
with thioketone group are adsorbed at this site. Orientation of molecu
lar dipoles of dyes is deduced to contribute, at least partly, to the
formation of electric dipole layers observed in UV photoemission spect
roscopy experiments.