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Abstract
Water-resistant poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films are valuable in biomedical applications; however, they typically require crosslinkers to stabilize the films, which can introduce undesired aggregation or phase separation reactions. Herein, we developed a dipping-based processes to prepare PEDOT:PSS films on non-planar surfaces without crosslinker. Sequential soaking of a dip-coated PEDOT:PSS film in ethanol and water imparted water resistance to the film. Microscopic and spectroscopic techniques were used to monitor the process and confirmed that the ethanol soaking eluted the excess PSS from the film bulk, which stabilized the film prior to the water-soaking process. The obtained films acted as conductors and semiconductors on curved surfaces, including three-dimensional (3D)-printed objects. A film deposited on a curved surface was successfully applied as the channel layer in a neuromorphic organic electrochemical transistor. This approach will enable integrated bioelectronic and neuromorphic applications that can be readily deployed for facile prototyping.
