Publication date: 15th December 2025
Attaining ion transport with artificial molecular transport systems (AMTS) is of high interest for many bioelectronic applications, as drug delivery or ion sensing.[1],[2] To drive the active transport of protons and metal ions, a potential drop is generated across an ionic membrane, which drives the ions through. While wired transport has been extensively investigated,[3],[4]contactless approaches for generating the potential drop have not been studied to the same extent so far. Asymmetric light illumination, for example, generates a potential drop that pumps the ions across the membrane, allowing for contactless, low-invasive transport. Existing AMTS are typically composed of lipid or liquid membranes.[5],[6] However, these lipid or liquid membranes come with challenges such as poor eficiency, fragilness, and compatibility issues with interacting components. To overcome these limitations , ionic, cross-linked and bio-compatible polymeric membranes have been proposed. Herein, we present the synthesis and characterization of different ionic/cross-linkable thiophene-based conjugated monomers, which are then electrochemically copolymerized, obtaining ionic cross-linked polythiophenes. We obtain homogeneous films with desirable VIS light absorption and stable electrochemical properties. With these characteristics, the obtained ionic cross-linked thiophene-based copolymers have the potential to be used as light-gated ion pump systems in biolectronic applications such as drug delivery.
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