EFFECT OF DOPING ON THE FABRICATION OF LANGMUIR AND LANGMUIR-BLODGETT-FILMS OF POLY(O-ETHOXYANILINE)

The properties of Langmuir films are generally dependent on the pH of the subphase. In a previous work, for instance, we observed that Langm uir films from poly(o-ethoxyaniline) (POEA) suitable for Langmuir-Blod gett deposition were only obtained if spread on an acidic subphase. Be cause POEA is highly soluble in both undoped and doped states, we have now extended these studies to systematically investigate the effect o f doping on the fabrication of Langmuir and LB films. The pressure-are a isotherms of the Langmuir films display less hysteresis and higher c ollapse pressures, when the polymer is doped in solution prior to spre ading of the monolayer on an acidic subphase. This procedure leads to stable films that can be readily deposited in the form of LB films.