Studies of poly(o-aminophenol) by quartz crystal impedance measurements

Conducting poly(o-aminophenol) films deposited on Pt electrodes were studied by quartz crystal impedance. The number of molecules of water per poly(o-aminophenol) equivalent in its oxidized form was determined to be approximately seven. As reduction proceeds, swelling of the film takes place but it still exhibits rigid features which make it suitable to analyse by the quartz crystal microbalance. Results show a slightly more rigid polymer at higher concentration of electrolyte and it was established that about 60% of the polymer film is electrochemically oxidized.