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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 et Steen B. Schougaard

Communication écrite (2017)

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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.

Sujet(s): 1800 Génie chimique > 1800 Génie chimique
1800 Génie chimique > 1802 Génie biochimique
Département: Département de génie chimique
Organismes subventionnaires: CRSNG/NSERC - Discovery Grant, Fonds de recherche - Nature et Technologies
URL de PolyPublie: https://publications.polymtl.ca/4821/
Nom de la conférence: Brain and Electrochemistry Symposium
Lieu de la conférence: National Harbor, Maryland
Date(s) de la conférence: 2017-10-01 - 2017-10-05
Titre de la revue: Journal of The Electrochemical Society (vol. 165, no 12)
Maison d'édition: IOP Science
DOI: 10.1149/2.0061812jes
URL officielle: https://doi.org/10.1149/2.0061812jes
Date du dépôt: 14 juil. 2021 14:38
Dernière modification: 26 sept. 2024 22:20
Citer en APA 7: Chhin, D., Polcari, D., Bodart-Le Guen, C., Tomasello, G., Cicoira, F., & Schougaard, S. B. (octobre 2017). Diazonium-based anchoring of PEDOT on Pt/Ir electrodes via diazonium chemistry [Communication écrite]. Brain and Electrochemistry Symposium, National Harbor, Maryland. Publié dans Journal of The Electrochemical Society, 165(12). https://doi.org/10.1149/2.0061812jes

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