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Long-term characterization of electrode materials for surface electrodes in biopotential recording

: Hoffmann, K.P.; Ruff, R.; Poppendieck, W.


28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS '06. Vol.1 : Aug. 30 2006-Sept. 3 2006
Piscataway: IEEE, 2006
ISBN: 1-4244-0032-5
Engineering in Medicine and Biology Society (Annual International Conference EMBS) <28, 2006, New York>
Conference Paper
Fraunhofer IBMT ()

The long-term electrical behavior of 16 different electrode materials was investigated by using continuous impedance spectroscopy over a period of 10 days. The materials included bare and electrolytically treated metals, metals coated with intrinsically conductive polymers, and polymers with conductive particles. Electrolytic treatment of metal electrodes yielded a significant impedance reduction. The lowest impedance values could be reached with the polymer-coated metal electrodes. The impedance behavior is an important aspect when choosing an electrode material, and has to be considered in signal processing. The choice of a material depends on the application of the electrode. Moreover, for long-term applications, the electrochemical stability of a material has to be considered.