title: Fabrication and Characterization of Ultrathin-ring Electrodes for Pseudo-steady-state Amperometric Detection.
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.
authors.affiliation: Division of Applied Life Science, Graduated School of Agriculture, Kyoto University.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kitazumi
authors.forename: Katsumi
authors.initials: K
authors.lastname: Hamamoto
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Noda
authors.forename: Osamu
authors.initials: O
authors.lastname: Shirai
authors.forename: Kenji
authors.initials: K
authors.lastname: Kano