PREPARATION OF LANGMUIR-BLODGETT-FILMS OF SOLUBLE POLYPYRROLE

Stable monolayers of soluble parent polypyrrole (Ppy) and mixed monola yers of cadmium stearate and Ppy were studied for the first time using surface pressure and surface potential isotherms. Ppy was obtained by chemical polymerization of the pyrrole monomer in the presence of dod ecylbenzene sulfonic acid and characterized by ultraviolet-visible (UV -vis), Fourier transform infrared (FTIR), and elemental analysis techn iques. Pure Ppy monolayers could only be transferred if optimized expe rimental conditions were employed, but mixed monolayers could be easil y transferred in the form of Y-type Langmuir-Blodgett (LB) films, with a uniform layer-by-layer transfer according to W-vis results. The FTI R spectrum indicated the presence of cadmium stearate along with Ppy. X-ray diffraction patterns showed the presence of cadmium stearate dom ains. The transferred LB films were characterized by electrical. condu ctivity, cyclic voltammetry, and surface potential measurements.