Modified Electrodes with Switchable Selectivity for Cationic and Anionic Redox Species |
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Authors: | Tsz Kin Tam Marcos Pita Mikhail Motornov Ihor Tokarev Sergiy Minko Evgeny Katz |
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Institution: | Department of Chemistry and Biomolecular Science and NanoBio Laboratory (NABLAB), Clarkson University, Potsdam NY 13699‐5810, USA |
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Abstract: | The modified electrode functionalized with a mixed‐polymer brush composed of poly(2‐vinylpyridine) and polyacrylic acid tethered to the surface demonstrated switchable interfacial properties discriminating negatively and positively charged redox species. The switchable electrochemical process was characterized by differential pulse voltammetry and Faradaic impedance spectroscopy. The electrochemical system was discussed as a model of an electrochemical multiplexer with two chemical redox inputs, the pH input operating as the selecting signal and one electronic output signal readable by the impedance spectroscopy in the form of the interfacial resistance. The modified electrode represents a novel component for integration with biocatalytic and biocomputing systems aiming at biochemically and electronically controlled actuators. |
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Keywords: | Switchable electrodes Modified electrodes Signal‐responsive electrodes Stimuli‐responsive electrodes Polymers |
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