Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Fabrication and Characterization of Ultrathin-ring Electrodes for Pseudo-steady-state Amperometric Detection
Yuki KITAZUMIKatsumi HAMAMOTOTatsuo NODAOsamu SHIRAIKenji KANO
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2015 Volume 31 Issue 7 Pages 603-607

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Abstract

The fabrication of ultrathin-ring electrodes with a diameter of 2 mm and a thickness of 100 nm is established. The ultrathin-ring electrodes provide a large density of pseudo-steady-state currents, and realize pseudo-steady-state amperometry under quiescent conditions without a Faraday cage. Under the limiting current conditions, the current response at the ultrathin-ring electrode can be well explained by the theory of the microband electrode response. Cyclic voltammograms at the ultrathin-ring electrode show sigmoidal characteristics with some hysteresis. Numerical simulation reveals that the hysteresis can be ascribed to the time-dependence of pseudo-steady-state current. The performance of amperometry with the ultrathin-ring electrode has been verified in its application to redox enzyme kinetic measurements.

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© 2015 by The Japan Society for Analytical Chemistry
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