Abstract
In neuroscience the use of a microelectrode array allows the detection of neuroelectric signals with high temporal resolution in a confined space within the tissue, while two-photon laser scanning microscopy provides high spatial resolution in a wide region of interest. The combination of these two techniques promises better understanding of the operation of neural pathways. To facilitate this connection, we studied the direct electrochemical deposition of the conductive polymer poly-2,3-ethylenedioxy-thiophene onto different Pt and Pt/Ir electrode surfaces from non-aqueous solvents, such as ionic liquid and propylene carbonate. We show the effects of electrochemical deposition technique (pulsed or continuous), monomer concentration range and solvent electrolyte type on the formation of photoluminescent - conductive films. For these variables we determined the optimal deposition parameters given as 0.025–0.050 M EDOT monomer concentration in BMIMBF4 ionic liquid and the use of pulsed deposition process to form an adherent, uniform functional electrode coating.
Highlights
The operation of neural pathways is based on transmission of chemical and electric signals and understanding this communication requires specific tools to record and conceive the signals
In this work we show our results on direct electrodeposition of photoluminescent PEDOT coatings onto neural microelectrodes and the optimization of the process in respect of used electrodeposition tech nique, monomer concentration and solvent electrolyte type
Note that the initial parts of all deposition cycles are similar to the initial part of the continuous deposition curve, clearly signaling the same electrochemical behavior
Summary
The operation of neural pathways is based on transmission of chemical and electric signals and understanding this communication requires specific tools to record and conceive the signals. Alternatives of non-aqueous ionic liquid (IL) electrolyte, such as propylene-carbonate (PC) have been already used [12] It is a lower cost material, but as the physical properties of the electrodeposited PEDOT are very dependant on the properties of the growth solvent [13], its use is not beneficial in every case. In this work we show our results on direct electrodeposition of photoluminescent PEDOT coatings onto neural microelectrodes and the optimization of the process in respect of used electrodeposition tech nique, monomer concentration and solvent electrolyte type. The novelty of the results is the development of an easy, one-step, dual-role surface modification procedure, which results in an electrode coating that maintains conductivity and provides high surface area, and creates site specific photoluminescence as added value to help exact site localization in nerve tissue electrode systems
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