STABILITY OF CONDUCTANCE IN ELECTROINACTIVE POLYPYRROLE

The stability of conductance in electropolymerized insulating polypyrr ole under application of a high voltage was investigated using a metal -insulator-metal-type diode device. The conductance varied over time d ue to application of the voltage, and the current-time profiles were c lassified into three types according to the level of the applied volta ge. In the very low voltage region the conductance was stable; in the middle voltage region the conductance increased to a stable value; and in the high voltage region the conductance first increased and then d ecreased. The mechanism of the change in conductance, the W-Vis absorp tion spectra and the photo-radiated current behaviour are dismissed.