Fabrication and Characterization of Ultrathin-ring Electrodes for Pseudo-steady-state Amperometric Detection
Authors:
- Katsumi HamamotoKHKatsumi Hamamoto
- Tatsuo NodaTNTatsuo Noda
- Osamu ShiraiOSOsamu Shirai
- Kenji KanoKKKenji Kano
- 10 July 2015
- journal article
- Published by Springer Nature in Analytical Sciences
- Vol. 31 (7) , 603-607
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.Keywords
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