Poly(p-phenylene/pyrrole) (PPP-PPY) films were electrochemically synthesised on transparent ndium-till-oxide-covered glass (110) electrodes. The presence of two monomers, p-phenylene and pyrrole, Ill the polymerisation medium facilitated the synthesis process, yielding electroactive, uniform and stable films. In order to obtain materials with improved quality, PPP, PPY and PPP-PPY films were prepared in a mild, dry atmosphere. The morphological, electrochemical and optical properties were compared for different films obtained by varying the number of cycles with and without controlling humidity. (C) 2015 Institute of Chemistry, Slovak Academy of Sciences