Doping and dedoping characteristics of polypyrrole (PPy) formed electr
ochemically have been examined by means of energy-dispersive X-ray spe
ctroscopy (EDS). Dodecylsulfate ions (DS-) and perchlorate ions (ClO4-
) were embedded simultaneously in PPy when both ions were present on t
he polymerization of pyrrole. Sequential formation of PPy in the singl
e dopant system allowed PPy/ClO4 to grow in the bulk of PPy/DS but not
vice versa. DS- was embedded not to leave the polymer on reduction bu
t ClO4- moved in and out of the polymer on redox reaction. Cyclic volt
ammetry was Employed to determine the redox reactivity of PPy in diffe
rent electrolyte systems. NaClO4 was a better electrolyte for cyclic r
edox reaction than LiClO4 or KClO4. NaCl was a good electrolyte fo. cy
clic redox reaction but Cl- failed to penetrate in the PPy/DS bulk on
reoxidation. The cyclic redox reactivity lasted longest when PPy/DS te
as redox-cycled sequentially in the NaCl electrolyte system and then i
n the NaClO4 system. (C) 1997 by John Wiley & Sons, Ltd.