Motion of redox molecules in solution monitored by the highly-sensitive EQCM technique |
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Authors: | Noriyuki Asakura Toshiaki Kamachi and Ichiro Okura |
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Institution: | (1) Department of Bioengineering, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Yokohama 226-8501, Japan |
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Abstract: | The behavior of redox molecules in solution that was not detected by electrochemical techniques was measured by a highly-sensitive
electrochemical quartz crystal microbalance (EQCM) technique that has been improved in this study to obtain a high sensitivity
of EQCM measurement in solution. The improved EQCM technique allowed to monitor the motion of a redox molecule, that is an
access of the molecule to an electrode surface and repulsion from the surface during redox. An EQCM technique currently in
use has measured adsorption of redox molecules on an electrode surface or polymerization on the surface caused by a chemical
reaction following redox, which exhibits an enough large mass change response to detect with an EQCM measurement. However,
access and repulsion of redox molecule, which is a slight motion of the molecule near on electrode surface, has not been detected
and investigated by an EQCM technique, because the mass change response seems to be very small. In this study, the redox behavior
of methyl viologen on a bare gold surface, pyridinethiol surface and methylpyridinethiol surface was investigated. Although
the three electrodes give the same cyclic voltammogram of methyl viologen, the three are different in QCM response recorded
at the same time as the voltammetry. Access/repulsion of methyl viologen within an electrical double layer was monitored by
the highly-sensitive EQCM technique. |
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Keywords: | EQCM viologen electron transfer |
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