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Synthesis of Polyaniline Using Electrostatically Layered Hematin Assemblies

Published online by Cambridge University Press:  15 March 2011

Bon-Cheol Ku
Affiliation:
Center for Advanced Materials, Departments of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854
Soo-Hyoung Lee
Affiliation:
Center for Advanced Materials, Departments of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854
Wei Liu
Affiliation:
Center for Advanced Materials, Departments of Chemistry, University of Massachusetts Lowell, Lowell, MA 01854
Jayant Kumar
Affiliation:
Center for Advanced Materials, Departments of Chemistry and Physics, University of Massachusetts Lowell, Lowell, MA 01854
Ferdinando F. Bruno
Affiliation:
Natick Soldier Center, U.S. Army Soldier & Biological Chemical Command, Natick, MA 01760
Lynne A. Samuelson
Affiliation:
Natick Soldier Center, U.S. Army Soldier & Biological Chemical Command, Natick, MA 01760
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Abstract

The enzyme horseradish peroxidase has been recently used for the polymerization of water-soluble conductive polyaniline. Hematin, an ironporphyrin molecule that catalyzes the oxidative polymerization of aniline and phenol, is a robust and inexpensive biomimetic alternative to horseradish peroxidase. Composite thin film assemblies were fabricated by electrostatic layer-by-layer (ELBL) alternate deposition of a polyelectrolyte, poly(dimethyl diallylammonium chloride), and hematin. These multilayer assemblies were then used for the polymerization of aniline in the presence of a polystyrene sulfonate as a template. It was found that the polymerization rate depends on both pH and the concentration of hematin deposited and the polyaniline synthesis was possible both onto the ELBL surfaces and in solution. It was also discovered that it is possible to reuse the ELBL assembled hematin substrates for multiple aniline polymerizations.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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