Controlled release of sulfosalicylic acid during electrochemical switching of conducting polymer bilayers

Conducting polymer bilayers containing polypyrrole/sulfosalicylic acid (SSA) as inner film and poly(N-methyl pyrrole)/polystyrene sulfonic acid (PSS) or PANI/PSS (PANI: polyaniline) as outer films were prepared by electrochemical methods. The controlled releasing of SSA from inner film was carried out by applying cathodic potential. The amount of SSA released has been investigated by UV spectrophotometry. SSA was reincorporated to inner film by applying anodic potential, then releasing of SSA has been performed at the above conditions. The controlled releasing of SSA from monolayer PANI was also studied.