Fast Electron-Transfer Kinetics Probed in Nanofluidic Channels

We demonstrate that a 50 nm high solution-filled cavity bounded by two parallel electrodes in which electrochemically active molecules undergo rapid redox cycling can be used to determine very fast electron-transfer kinetics. We illustrate this capability by showing that the heterogeneous rate const...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2009-08, Vol.131 (32), p.11471-11477
Main Authors: Zevenbergen, Marcel A. G., Wolfrum, Bernhard L., Goluch, Edgar D., Singh, Pradyumna S., Lemay, Serge G.
Format: Article
Language:English
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Summary:We demonstrate that a 50 nm high solution-filled cavity bounded by two parallel electrodes in which electrochemically active molecules undergo rapid redox cycling can be used to determine very fast electron-transfer kinetics. We illustrate this capability by showing that the heterogeneous rate constant of Fc(MeOH)2 sensitively depends on the type and concentration of the supporting electrolyte. These solid-state devices are mechanically robust and stable over time and therefore have the potential to become a widespread and versatile tool for electrochemical measurements.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja902331u