Langmuir-Blodgett films from conjugated polymers

The recent developments on the main strategies for fabricating Langmuir-Blodgett (LB) films from conducting polymers are presented. Because this is a brief report, we concentrate on our latest results on films produced from parent polyaniline and poly(alkoxyanilines). It is found that the use of a pre-doped polymer on a subphase containing a doping agent enhanced significantly the quality of the Langmuir monolayer. When transferred onto a solid substrate the LB films are already in the doped state as confirmed by UV-Vis spectroscopy. LB films obtained with pre-doped poly(alkoxyanilines) exhibit electrochromism, with color changes from yellow to dark blue as the potential in an electrochemical cell is varied from -0.1 V to 0.7 V (versus SCE). In addition, good quality LB films were obtained with pre-doped, high molecular weight parent polyaniline