In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material

Ik Soo Kwon; Young Jo Kim; Luke Klosterman; Mats Forssell; Gary K. Fedder; Christopher J. Bettinger

doi:10.1039/C5TB02618K

In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material†

Ik Soo Kwon,^a Young Jo Kim,^a Luke Klosterman,^a Mats Forssell,^b Gary K. Fedder^bc and Christopher J. Bettinger*^ade

* Corresponding authors

^a Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA
E-mail: cbetting@andrew.cmu.edu

^b Department of Electrical and Computer Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA

^c The Robotics Institute, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA

^d Department of Biomedical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, PA 15213, USA

^e McGowan Institute for Regenerative Medicine, University of Pittsburgh, 450 Technology Drive, Suite 300, Pittsburgh, PA 15219, USA

Abstract

The properties of redox active polydopamine melanin (PDM) films as a coating material for tissue stimulation electrodes were evaluated. PDM films with nanometer-scale thicknesses exhibit dc bias dependent charge injection capacities (CIC) with maximum values of 110 ± 23 μC cm⁻² at 0.2 V (vs. Ag/AgCl) and reduce the interfacial impedance compared to inorganic conducting films. PDM films exhibit an asymmetric impedance response to positive and negative dc biases with minimum interfacial impedance at 0.2 V (vs. Ag/AgCl). An explanation for the observed bias-dependent electrochemical behavior is presented.

This article is part of the themed collection: Emerging Investigators 2016: Novel design strategies for new functional materials

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DOI: https://doi.org/10.1039/C5TB02618K
Article type: Communication
Submitted: 11 Dec 2015
Accepted: 18 Feb 2016
First published: 23 Feb 2016

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J. Mater. Chem. B, 2016,4, 3031-3036

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In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material

I. S. Kwon, Y. J. Kim, L. Klosterman, M. Forssell, G. K. Fedder and C. J. Bettinger, J. Mater. Chem. B, 2016, 4, 3031 DOI: 10.1039/C5TB02618K

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Journal of Materials Chemistry B

In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material†

Abstract

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In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material

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