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Updated: Feb 3, 2026

Spray-Coated Melanin/PEDOT:PSS Films for Sustainable Organic Electrochemical Transistors
Published on: October 28, 2025
In vitro electrochemical characterization of polydopamine melanin as a tissue stimulating electrode material
Ik Soo Kwon1, Young Jo Kim1, Luke Klosterman1
1Department of Materials Science and Engineering, Carnegie Mellon University 5000 Forbes Ave, Pittsburgh, PA 15213 (USA).
Abstract:
The properties of redox active polydopamine melanin (PDM) films as a coating material for neural 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 0.2V (vs Ag/AgCl) and reduce the interfacial impedance compared to inorganic conducting films. PDM films exhibited an asymmetric impedance response to positive and negative dc biases with minimum interfacial impedance at 0.2V (vs Ag/AgCl). An explanation for the observed bias-dependent electrochemical behavior is presented.
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