Abstract
Poly (3-dodecylthiophene) with a fractal pattern has been successfully prepared by an electrochemical method at the liquid-gas interface. At the applied voltage of 10 V, its fractal dimension indicates a maximum value 1. 64±0.03 which nearly coincides with the theoretical value 5/3 expected from a DLA model. At lower voltages, the growth is controlled by diffu-sion of monomer molecules and electrolyte ions. However, at higher voltages, field assisted drift seems to play roles. The conductivity and the growth rate etc. have been found to be related with fractal dimension. At higher applied voltages, an undoped region has been seen to appear in the middle part of branches, which has influenced the growing speed of the tip of growth. By shortening the circuit, the undoping initiated from the tip of the growth and proceeded to the center.
