Individually addressable, submicrometer band electrode arrays. 2. Electrochemical characterization

by Nagale, Milind P.; Fritsch, Ingrid

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We report extensive cyclic voltammetric evaluation of gold submicrometer edge band electrodes with different widths, from 25.3 to 143.5 nm, Fabrication of these band electrodes from layers of gold and silicon nitride using conventional microfabrication techniques, was reported in the preceding companion paper. Gold film thicknesses and, thus, the electrode widths were measured by surface profilometry, X-ray interferometry, and atomic force microscopy, The electrodes exhibit typical sigmoidal-shaped cyclic voltammograms at slow scan rates ( 25 V/s), Capacitance of the edge band electrodes is high (187-0.206 mF/cm(2) for 71.2-nm edge band electrodes for scan rates of 0.010-204 V/s) and scan rate dependent. Values approach those of macroelectrodes at fast scan rates, indicating imperfect seals at the gold/silicon nitride, gold/Cr/glass, or gold/epoxy interfaces.

Journal
Analytical Chemistry
Volume
70
Issue
14
Year
1998
Start Page
2908
ISBN/ISSN
0003-2700
DOI
10.1021/ac971041p