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Electrochemical polymerization can be used to directly synthesize conducting polymers while incorporating different functional molecules such as proteins for specific applications. There is a need to systematically study the effects of synthetic conditions for a polymer/protein composite on its nanostructure, chem/physical properties, and bioactivities. In this study, collagen, a cell‐adhesion protein, was impregnated in poly(3,4‐ethylenedioxythiophene) (PEDOT) via galvanostatic electropolymerization, and demonstrated binding with the PEDOT backbone and excellent stability. The polymer polymerized at lower current densities shows good electroactivity. Oxidation level of PEDOT was investigated by Raman spectroscopy. The results show that simple inorganic anions are more readily to be doped into the polymer than the bulky collagen molecules. Scanning electron microscope (SEM) observation reveals that the …