Branching Patterns of a Conducting Polymer Polymerized Electrochemically with a Constant‐Current Source

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Abstract
A conducting polymer, polypyrrole with fractal patterns, has been formed by a constant‐current polymerization method. The patterns of growth on the surface of the cell have been classified into three types; needle‐like, DLA‐like, and broad leaf‐like. The type of pattern formed by polymerization with constant‐current control varied with time since the effective applied voltage decreased with time. The change in the pattern has been estimated numerically by the fractal dimension.

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