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| - Polymer−Surfactant Layered Heterostructures by Electropolymerization of Phenosafraninein Langmuir−Blodgett Films
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| - Langmuir−Blodgett (LB) films of the water-soluble dye phenosafranine (PS) have been prepared by itsadsorption from aqueous dye solution to an arachidic acid (AA) monolayer at the air−water interface. Atomicforce microscopy (AFM) images of the LB films revealed the effect of change in pH of deposition on thedegree of complexation of AA with the PS dye. Well-defined circular islands and holes were observed whichdisappeared with the increase in pH. Polarized absorption studies indicated that the dye molecules are orienteduniaxially with their long axis titled at a constant angle to the surface normal of the LB film. Within therestricted geometry of the LB film, the PS dye was electropolymerized to form a two-dimensional film ofpoly(phenosafranine) sandwiched between arachidic acid layers. The film was characterized by IR spectroscopy,cyclic voltammetry, and AFM. X-ray diffraction studies reveal the presence of a layer structure in the AA−PS LB film before and after polymerization. The polymer film showed highly anisotropic electrical conductivityof ca. 10 orders of magnitude. This indicates the formation of two-dimensional polyPS layers between arachidicacid layers resulting in a layered heterostructure film having alternate conducting and insulating regions.Also, the conductivity of the polyPS prepared from LB film was found to be ∼2.5 times higher than theconductivity of polyPS prepared by solution polymerization method.
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