Controlled electrochemical synthesis of polypyrrole nanoparticle thin film and its redox transition to a highly conductive and stable polypyrrole variant

Langmuir : the ACS Journal of Surfaces and Colloids
Richard West, Xiangqun Zeng

Abstract

We demonstrated here a unique method to produce a highly stable and conductive polypyrrole (PPY) nanoparticle film. The procedure entails controlling the redox switching and the electrochemical synthesis of PPY. PPY was synthesized at a very low forming potential or reaction rate in nonaqueous CH2Cl2 solvent to promote the PPY nanoparticle formation. Then its property was further optimized by first electrochemically reducing it at a hydrogen evolution potential in a neutral 0.1 M NaClO4, then in a slightly acidic 0.05 M asparagine electrolyte. The PPY nanoparticle thin film was characterized by AFM, UV-vis and EQCM. The procedures described here have proven to be reproducible. The data provided by the EQCM shows a reversible doping and undoping mechanism of asparagine indicating the presence of a highly conductive PPY variant. Both UV-vis and electrochemical characterization suggest that the PPY film made using our approach has excellent redox activity as well as high stability when characterized in asparagine solution. The reversible doping and undoping of asparagine during redox switching shows great potential of these PPY nanoparticle films as biological membranes for a broad range of biological applications.

References

Feb 6, 2004·Journal of Biomedical Materials Research. Part a·Xioadong WangGang Chen
Mar 23, 2006·Colloids and Surfaces. B, Biointerfaces·Almira RamanavicieneArunas Ramanavicius
Jul 21, 2006·The Journal of Physical Chemistry. B·Carlos Cesar Bof BufonJürgen Heinze

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