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Transparent poly(3,4-ethylenedioxythiophene)-based Microelectrodes for Extracellular Recording

Transparent poly(3,4-ethylenedioxythiophene)-based Microelectrodes for Extracellular Recording

Dennis Flachs, Tim Köhler, Christiane Thielemann

Biointerphases. 2018 Aug 6;13(4):041008.

PMID: 30081642

Abstract:

It is well known that at the interface between neuronal tissue and recording electrode low electrical impedance is required. However, if simultaneous optical detection or stimulation is an issue, good optical transmittance of the electrode material is desirable as well. State-of-the-art titanium nitride electrodes provide superior low impedance compared to gold or iridium, but are nontransparent. Transparent electrode materials like the transparent conducting oxide, indium tin oxide (ITO), or graphene offer high light transmittance (>80%) but reveal relatively high impedance. In this paper, the authors propose the conducting polymer poly(3,4-ethylenedioxythiophene) with the counter ion NO3- as the electrode material for low impedance and good optical transmittance properties. The polymer is electrochemically deposited onto ITO improving the relatively high impedance of ITO. This multilayer electrode allows not only for electrophysiological recordings of cardiomyocytes but also for monitoring of cell contraction under the microscope. Electrochemical impedance spectroscopy and action potential recordings reveal that the new transparent electrodes are a good compromise in terms of low impedance and transparency if deposition parameters are optimized.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP126213512	Poly(3,4-ethylenedioxythiophene)		126213-51-2	Price

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