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Diazonium-based anchoring of PEDOT on Pt/Ir electrodes via diazonium chemistry

Danny Chhin, David Polcari, Côme Bodart-Le Guen, Gaia Tomasello, Fabio Cicoira and Steen B. Schougaard

Conference or Workshop Item - Paper (2018)

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Cite this document: Chhin, D., Polcari, D., Bodart-Le Guen, C., Tomasello, G., Cicoira, F. & Schougaard, S. B. (2017, October). Diazonium-based anchoring of PEDOT on Pt/Ir electrodes via diazonium chemistry. Paper presented at Brain and Electrochemistry Symposium, National Harbor, Maryland. doi:10.1149/2.0061812jes
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Abstract

Conducting polymers, specifically poly (3,4-ethylenedioxythiophene) (PEDOT), have recently been coated onto Pt/Ir electrodes intended for neural applications, such as deep brain stimulation (DBS). This modification reduces impedance, increases biocompatibility, and increases electrochemically active surface area. However, direct electropolymerization of PEDOT onto a metallic surface results in physically adsorbed films that suffer from poor adhesion, precluding their use in applications requiring in vivo functionality (i.e. DBS treatment). In this work, we propose a new attachment strategy, whereby PEDOT is covalently attached to an electrode surface through an intermediate phenylthiophene layer, deposited by electrochemical reduction of a diazonium salt. Our electrodes retain their electrochemical performance after more than 1000 redox cycles, whereas physically adsorbed films begin to delaminate after only 40 cycles. Additionally, covalently attached PEDOT maintained strong adhesion even after 10 minutes of ultrasonication (vs. 10 s for physically adsorbed films), confirming its suitability for long-term implantation in the brain. The simple two-step covalent attachment strategy proposed here is particularly useful for neural applications and could also be adapted to introduce other functionalities on the conducting surface.

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
1800 Génie chimique > 1802 Génie biochimique
Department: Département de génie chimique
Research Center: Non applicable
Funders: CRSNG/NSERC - Discovery Grant, Fonds de recherche - Nature et Technologies
Date Deposited: 14 Jul 2021 14:38
Last Modified: 15 Jul 2021 01:20
PolyPublie URL: https://publications.polymtl.ca/4821/
Document issued by the official publisher
Conference Title: Brain and Electrochemistry Symposium
Conference Location: National Harbor, Maryland
Conference Date(s): 2017-10-01 - 2017-10-05
Journal Title: Journal of The Electrochemical Society (vol. 165, no. 12)
Publisher: IOP Science
Official URL: https://doi.org/10.1149/2.0061812jes

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