S. Demoustierchampagne et al., CHARGE-TRANSPORT AND ION-TRANSPORT PROPERTIES OF POLYPYRROLE POLY(STYRENESULFONATE) POLY(3-OCTYLTHIOPHENE) BILAYERS, Chemistry of materials, 7(2), 1995, pp. 277-283
The electrochemical, electronic, charge-transport, and ion-transport p
roperties of a conducting polymer bilayer, prepared using polypyrrole/
poly(styrenesulfonate) (PP/PSS) and poly(3-octylthiophene) (POT) have
been investigated by cyclic voltammetry, optoelectro-chemistry, and a
combination of electrochemical and gravimetric techniques using the el
ectrochemical quartz crystal microbalance (EQCM). This PP/PSS:POT bila
yer presents separate redox switching potentials demonstrating that ch
arge is efficiently transferred through the inner PP/PSS layer to the
POT outer layer. While the bilayer exhibits reversible redox processes
for both components during rapidly repeated cyclic voltammetric scans
, poising the potential at a highly reducing value (-1.2 V vs Ag/Ag+)
for a sufficient time prior to starting a potential scan severely limi
ted the redox processes of the PP/PSS inner layer. This is most likely
due to inhibited counterion transport through the neutral POT outer l
ayer.