The Mediated Electrodeposition of Polypyrrole on Aluminium Alloy
Kirill L. Levine A , Dennis E. Tallman A C and Gordon P. Bierwagen BA Department of Chemistry, North Dakota State University, Fargo, ND 58105-5516, USA.
B Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND 58105-5376, USA.
C Corresponding author. Email: dennis.tallman@ndsu.edu
Australian Journal of Chemistry 58(4) 294-301 https://doi.org/10.1071/CH04289
Submitted: 20 December 2004 Accepted: 2 March 2005 Published: 5 April 2005
Abstract
The direct electrodeposition of conjugated polymers onto active metals such as aluminium and its alloys is complicated by the concomitant oxidation of the metal that occurs at the positive potential required for polymer formation/deposition. We have developed an approach that uses electron transfer mediation to reduce the deposition potential of polypyrrole on aluminium and aluminium alloy by nearly 500 mV, permitting film deposition from aqueous solution with nearly 100% current efficiency. The mediator used in this initial work was 4,5-dihydroxy-1,3-benzenedisulfonate (DHBDS, disodium salt), which also served as the dopant or counter ion in the polymer. To better understand the mediation process, a series of substituted benzene compounds have been explored for their mediating properties. From these studies, we conclude that both the hydroxyl and the sulfonate functionalities of DHBDS appear to play a role in the mediated electrodeposition at aluminium alloy. New mediators for the electrodeposition of polypyrrole on Al alloy are suggested.
Acknowledgements
This work was supported by the Air Force Office of Scientific Research (grant no. FA9559-04-1-0368) and also by the United States Air Force Research Laboratory, University of Dayton (grant no. RSC02050).
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D. E. Tallman,
Y. Pae,
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