Amino-acid-doped polypyrroles obtained by electrochemical polymerization of pyrrole in various natural α-amino acid aqueous solutions under the nitrogen atmosphere have been studied in this paper.The experiments show that the oxidation potential is relatively low and the polymerization rate is relatively high in acidic amino acid solutions

but the electrochemical polymerization barely occurs in alkaline solutions.In the electrolytic polymerization process

the amino acids act both as supporting electrolytes

and as dopant ions doped into the polymer

which can be proved by Raman

FTIR

and UV-Vis spectra.The electronic conductivity of polypyrrole is measured in the range of 0.3 and 1.0 S /cm

and the conductivity of the products obtained in strong amino acid is obviously higher than that obtained in weak amino acid.The polymers exhibit good electrochemical activity and stability

the cyclic voltammograms of these polymers have a pair of oxidationreduction peaks between-0.5 V and 0.5 V

and their shape and trait of the polymers can stay stable after 100 electrochemical cycles.Different amino acids have different effects on the shape of the polypyrrole

polypyrrole with nano-fiber structure forms in some of the amino acid solutions due to the soft template effect

which can be seen from the SEM and TEM images.