PEDOT-CNT composite microelectrodes for recording and electrostimulation applications: fabrication, morphology, and electrical properties

Composites of carbonnanotubesandpoly(3,4-ethylenedioxythiophene,PEDOT) and lay-ers of PEDOT are deposited onto microelectrodes by electropolymerization of ethylene-dioxythiophene in the presence of a suspensio of carbon nanotubes and polystyrenesulfonate.Analysis by FIB and SEM demonstrates that CNT–PEDOT composites exhibit a porous morphology whereas PEDOT layers are more compact. Accordingly,capacitance and charge injection capacity of the composite material exceed those of pure PEDOT layers. In vitro cell culture experiments reveal excellent biocompatibility and adhesion of both PEDOT and PEDOT–CNT electrodes.Signals recorded from heart muscle cells demonstrate the high S/N ratio achievable with these electrodes. Long-term pulsing experiments con-firm stability of charge injection capacity.In conclusion a robust fabrication procedure for composite PEDOT–CNT electrodes is demonstrated and results show that these electrodes are well suited for stimulation and recording in cardiac and neurophysiological research.

Gerwig, R., K. Fuchsberger, B. Schroeppel, G.S. Link, G. Heusel, U. Kraushaar, W. Schuhmann, A. Stett, M. Stelzle

Frontiers in Neuroengineering





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