In-Situ Measurement of Surface Tension During Electrochemical Doping of Polypyrrole Films

We have performed in-situ measurement of surface tension during the electrochemical oxidation-reduction process of polypyrrole films by using Wilhelmy'S plate technique with specially designed electrochemical cell. Polypyrroles were synthesized on a platinum plate electrode with various dopants and placed in the electrochemical cell. Dynamic contact angle was measured by using the Wilhelmy plate technique while the electrochemical potential was applied. Polypyrrole showed the changes in contact angle during the electrochemical oxidation-reduction process. Effects of dopants and the redox potential on the contact angle was studied.