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Interdigitated microband electrodes: chronoamperometry and steady state currents

1989; Elsevier BV; Volume: 266; Issue: 2 Linguagem: Inglês

10.1016/0022-0728(89)85070-3

2590-2954

Brian Seddon, Hubert H. Girault, M.J. Eddowes,

Electrochemical sensors and biosensors

The chronoamperometric response of an interdigitated microband electrode is reported. For the electrode design considered, a steady state current density of 2.3 A m mol−1 is observed within 2 s, allowing the amperometric measurement of analyte concentrations down to the low micromolar range. An explicit finite difference method is used to model the current-time response of the device operated as a system of closely spaced band electrodes and as an alternate anode-cathode system. An analytical expression is presented for the steady state current to an interdigitated microband electrode in terms of the geometric parameters, bandwidth and bandgap. The current density calculated from this expression is consistent with simulated and experimental data, and predicts a magnitude of kA m−2 mol−1 for submicroscopic interdigitated electrodes.