Application of PEDOT-CNT Microelectrodes for Neurotransmitter Sensing
Creators
- 1. NMI Natural and Medical Sciences Institute at the University of Tübingen
- 2. RUB Bochum
Description
In this work, composite microelectrodes from poly(3,4-ethylenedioxythiophene) (PEDOT) and carbon nanotubes (CNT) are characterized as electrochemical sensing material for neurotransmitters. Dopamine can be detected using square wave voltammetry at these microelectrodes. The CNTs improve the sensitivity by a factor of two. In addition, the selectivity towards dopamine in the presence of ascorbic acid and uric acid was examined. While both electrodes, PEDOT and PEDOT-CNT are able to detect all measured concentrations of dopamine
in the presence of uric acid, small concentrations of dopamine and ascorbic acid are only distinguishable at PEDOT-CNT electrodes. Changing the pH has a strong influence on the selectivity. Moreover, it is possible to detect concentrations as low as 1 mM dopamine in complex cell culture medium. Finally, other catecholamines like serotonin, epinephrine, norepinephrine and l-dopa are also electrochemically detectable at PEDOT-CNT microelectrodes.
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