Gravimetric measurement in redox polymer electrodes with the EQCM beyond the Sauerbrey limit

Gravimetric measurements during electrochemical redox switching of an Os-co ntaining hydrogel film in contact with aqueous electrolyte have been obtain ed beyond the Sauerbrey rigid mass limit of the electrochemical quartz crys tal microbalance (EQCM). For an acoustically non-rigid film the frequency-t o-mass Sauerbrey relationship is not valid and the mass has been obtained f rom the experimental electroacoustic impedance data collected simultaneousl y with electrochemical experiments interpreted using Martin's viscoelastic model. (C) 1999 Elsevier Science S.A. All rights reserved.