Adsorption of pseudoisocyanine and of a thiacarbocyanine dyes on silver halides nanoparticles

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Abstract

Pseudoisocyanine and a thiacarbocyanine dyes have been adsorbed on silver halides nanoparticles synthesized in a microemulsion system (AOT/heptane/water). The adsorption of pseudoisocyanine leads to the sedimentation of the particles. This can be decreased by adding an appropriate amount of CTAB (cetyltrimethylammonium bromide). The site of adsorption of a thiacarbocyanine has been investigated. The cyanine adsorption is stabilized by an interaction between the sulphur atom and the silver ion on the silver bromide particles and by a coulombic interaction between the nitrogen atom and the chloride ion on the silver chloride particles.

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