Specific effects of the counterion type and concentration on the construction and morphology of polycation/azo dye multilayers

▶ Specificity of counterion manifested in dye amount adsorbed. ▶ Counterions modified the conformation and the amount of the adsorbed polycation. ▶ Dye molecules adsorbed in loosely packed layer of polycation in presence of Cl− or Br−. ▶ Gel-like matrix formed by the interaction between polycation and SO42− counterions.