Morphological characterization of innovative electroconductive polymers in early stages of growth

► Electrochemical deposition of doped polypyrrole films. ► The doping anions: heparin (pharmacological interest) and perchlorate (reference). ► AFM characterization of the very first growth stages: growth mechanism is influenced by the substrate. ► Comparison of the effect of the different doping anions in the growth mechanism. ► Baseline for new intelligent substrates for cell growth and controlled drug delivery.