Issue 24, 2023

Electrodeposition of PEDOT:ClO4 on non-noble tungsten microwire for nerve and brain recordings

Abstract

Tungsten microwires are commonly used in neuroscience for their high mechanical strength, flexibility, which allows tailoring them to brain and peripheral nerve implantations, and cost-effectiveness compared to other electrode materials. However, challenges such as high impedance and foreign body reactions limit their use as acute and chronic electrophysiology tools. In this work, we propose a novel method for successfully coating tungsten microwires with PEDOT (poly(3,4-ethylenedioxythiophene)) doped with perchlorate anions ClO4 using electropolymerization. Pre-treatment of the microwires with annealing resulted in the formation of a WO3 coating that facilitated the nucleation and deposition of PEDOT, which was more homogeneous than that on gold microwires under the same conditions. In vitro, PEDOT decreased the impedance and increased the capacitance compared to bare tungsten microwires. In vivo, the PEDOT coating enhanced the signal-to-noise ratio and reduced the standard deviation of noise in acute preliminary electrophysiology recordings of spontaneous activity in the brain and evoked activity in the sciatic nerve of the rat.

Graphical abstract: Electrodeposition of PEDOT:ClO4 on non-noble tungsten microwire for nerve and brain recordings

Supplementary files

Article information

Article type
Paper
Submitted
01 nov 2023
Accepted
04 nov 2023
First published
04 dec 2023
This article is Open Access
Creative Commons BY license

Mater. Adv., 2023,4, 6741-6753

Electrodeposition of PEDOT:ClO4 on non-noble tungsten microwire for nerve and brain recordings

A. Güemes, A. Dominguez-Alfaro, R. Mizuta, S. Velasco-Bosom, A. Carnicer-Lombarte, D. G. Barone, D. Mecerreyes and G. Malliaras, Mater. Adv., 2023, 4, 6741 DOI: 10.1039/D3MA00949A

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