Optical Gating of Photosensitive Synthetic Ion Channels

Authors

  • Mubarak Ali,

    Corresponding author
    1. Department of Material- and Geo-Sciences, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany
    2. Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
    • Department of Material- and Geo-Sciences, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany.
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  • Saima Nasir,

    1. Department of Material- and Geo-Sciences, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany
    2. Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
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  • Patricio Ramirez,

    1. Dept. de Física Aplicada, Universitat Politécnica de València, E-46022 Valencia, Spain
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  • Ishtiaq Ahmed,

    1. Karlsruher Institute of Technology, DFG-Center for Functional Nanostructures, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany
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  • Quoc Hung Nguyen,

    1. Department of Material- and Geo-Sciences, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany
    2. Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
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  • Ljiljana Fruk,

    1. Karlsruher Institute of Technology, DFG-Center for Functional Nanostructures, Wolfgang-Gaede-Strasse 1, D-76131 Karlsruhe, Germany
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  • Salvador Mafe,

    1. Dept. de Física de la Terra i Termodinàmica, Universitat de València, E-46100 Burjassot, Spain
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  • Wolfgang Ensinger

    1. Department of Material- and Geo-Sciences, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany
    2. Materials Research Department, GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291, Darmstadt, Germany
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Abstract

4-oxo-4-(pyren-4-ylmethoxy) butanoic acid is used as a photolabile protecting group to show the optical gating of nanofluidic devices based on synthetic ion channels. The inner surface of the channels is decorated with monolayers of photolabile hydrophobic molecules that can be removed by irradiation, which leads to the generation of hydrophilic groups. This process can be exploited in the UV-light-triggered permselective transport of ionic species in aqueous solution through the channels. The optical gating of a single conical nanochannel and multichannel polymeric membranes is characterised experimentally and theoretically by means of current–voltage and selective permeation measurements, respectively. It is anticipated that the integration of nanostructures into multifunctional devices is feasible and can readily find applications in light-induced controlled release, sensing, and information processing.

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