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Proceedings Paper

Robustness and repeatability test of interdigitated electrodes on a polymer substrate in an aqueous environment
Author(s): Jacklyn Holmes; Brian W. Anthony
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Paper Abstract

Interdigitated electrodes are used as sensing components in microfluidic lab-on-a-chip devices. The Daktari Diagnostics system uses electrodes to measure the change in impedance of a fluid in an assay chamber. A new testing method was developed and validated to characterize the sources of defects in electrodes and used to validate a new manufacturing process. The impedance of an electrode-in-solution system for solutions of different known conductivities was measured. The characteristic linear relationship (slope) between the inverse of the impedance to the solution conductivities was estimated. Repeatability tests found an average slope of 1.438x10-5 (1/Ω)/(μS/cm) - or cm/characteristic length - with a standard deviation of 8.52x10-8 cm/characteristic length. The impact of defective electrode fingers and mechanical bending on electrode performance was characterized.

Paper Details

Date Published: 15 February 2012
PDF: 6 pages
Proc. SPIE 8251, Microfluidics, BioMEMS, and Medical Microsystems X, 825110 (15 February 2012); doi: 10.1117/12.910358
Show Author Affiliations
Jacklyn Holmes, The Boeing Co. (United States)
Massachusetts Institute of Technology (United States)
Brian W. Anthony, Massachusetts Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8251:
Microfluidics, BioMEMS, and Medical Microsystems X
Holger Becker; Bonnie L. Gray, Editor(s)

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