Abstract
A large electroactive particle, 1.3 μm in radius, is synthesized by coating the polystyrene latex with electroactive polyaniline film. It is monodispersed in size. Since the outside layer is electrically conductive, the electrode reaction propagates over the surface rapidly when it comes in contact locally with the electrode. Thus, it can be regarded as a model of a single redox particle, possessing the huge number of electrons, n. The colloidal suspension of the latex in HCl shows a steady-state anodic wave at a microelectrode. The value of n is 5.6×10 10 by means of bulk electrolysis. The limiting current after eliminating noise of the electric power source exhibits periodical oscillation with 14 Hz. No periodicity is found in the blank or in Fe(CN) 6 4− solution. The oscillation indicates collision of the particle to the electrode to cause the oxidation. The product of the current by the period is much smaller than the redox charge on the single particle.
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