DOI: https://doi.org/10.29363/nanoge.aohm.2019.034
Publication date: 8th January 2019
In this research, we developed organic bioelectronic interfaces based on highly crystalline poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) films or microfibers to overcome the trade-off between electrical/electrochemical performance and aqueous stability. Crystalline PEDOT:PSS films exhibits excellent electrical/electrochemical/optical characteristics, long-term aqueous stability without film dissolution/delamination, and good viability for primarily cultured cardiomyocytes and neurons over several weeks. Furthermore, the consequent cellular electrodes based on crystalline PEDOT:PSS films show good cell/tissue adhesion, dramatically enlarged surface areas, and electrochemical capacitance, which are successfully employed for PEDOT:PSS-based multi-electrode arrays (MEAs) to record and stimulate the activities of primarily cultured cardiomyocytes and chicken retinae tissues. In parallel, we developed that crystalline PEDOT:PSS microfibers with high electrical conductivity and aqueous stability can be formed using strong acid-based coagulation media and employed for single-strand wearable sweat sensors in the configuration of organic electrochemical transistor and volumetric ion storage devices with arbitrary 3-D shapes. Finally, we demonstrated that electrochemically active PEDOT:PSS can be incorporated into hydrogel microfibers, which can be beneficial for 3-D neuronal cell cultures.
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