Learning effect of composite conducting polymer

Conducting polymers with fractal patterns have been polymerized electrochemically under some conditions. The pattern of neuron-like conducting polymer has been prepared by controlling the polymerization conditions. Furthermore, the network of neuron-like conducting polymer has been prepared. If this kind of conducting polymer has the properties of learning effect and non-linearity, it works as neuron device. In this article, the method for adding the learning effect to the channel of conducting polymer has been investigated. In conducting polymer gels, the dopant easily moves in or out of conducting polymers in some solvents and in this time the gel swells or shrinks. On the other hand, polypyrrole is stable in such solvents. A composite film of polypyrrole and conducting polymer gel, poly (3-hexylthiophene), has been used to suppress the change of shape of conducting polymer gel. The technique of neural network was used as a method of learning effect. A simple network has been used instead of actual complicated conducting polymer network. It was confirmed that the conductivity of the channel network changed for correspondence to a teacher signal flow. (C) 2003 Elsevier B.V. All rights reserved.