MICROHOLE ARRAY ELECTRODES BASED ON MICROPOROUS ALUMINA MEMBRANES

Majda et aL developed and investigated modified electrodes based on microporous alumina membranes.1-8The membranes had cylindrical pores of equivalent diameter and were prepared via a derivative of a classical electrochemical method.9-11 Majda et al. attached various electroactive molecules to the pore walls and investigated rates of lateral electron transfer in these membranes. More recently, related electrochemical devices—“microhole” and “microhole array” electrodes—were developed and investigated by Bond et al.12and Shimizu et al.13-17These are related devices because the electrode elements are recessed within pores. These devices are used as electrochemical detectors for electroactive analyte molecules in a contacting solution phase.14-17The key advantage of such detectors is that the electrochemical signal is insensitive to convection or flow in the contacting solution phase, because the electrode element is recessed. © 1992, American Chemical Society. All rights reserved.