HIGH-FREQUENCY IMPEDANCE ANALYSIS OF QUARTZ-CRYSTAL MICROBALANCES COATED WITH CONDUCTING POLYMERS

In this paper, high frequency impedance analysis of an electrochemical quartz crystal microbalance is employed to monitor changes in the vis coelastic properties of conducting polymers. The frequency and motiona l inductance sensitivity measured during the electrodeposition of Cu, Ag and polypyrrole(tosylate) is compared with the theory for various q uartz crystals of different cuts and fundamental resonant frequencies. It is found that changes in resonant resistance do not significantly depend on the quartzes used. It is shown that this technique is partic ularly appropriate for probe disparities in the morphology of conducti ng polymer films depending on the solvent, the size of the counteranio n or the substrate. Changes in the viscoelastic properties of polypyrr ole(tosylate) films up to 200-degrees-C were also investigated.