Robustness and repeatability test of interdigitated electrodes on a polymer substrate in an aqueous environment

Jacklyn Holmes; Brian W. Anthony

doi:10.1117/12.910358

14 February 2012 Robustness and repeatability test of interdigitated electrodes on a polymer substrate in an aqueous environment

Jacklyn Holmes, Brian W. Anthony

Author Affiliations +

Proceedings Volume 8251, Microfluidics, BioMEMS, and Medical Microsystems X; 825110 (2012) https://doi.org/10.1117/12.910358
Event: SPIE MOEMS-MEMS, 2012, San Francisco, California, United States

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.

Citation Download Citation

Jacklyn Holmes and Brian W. Anthony "Robustness and repeatability test of interdigitated electrodes on a polymer substrate in an aqueous environment", Proc. SPIE 8251, Microfluidics, BioMEMS, and Medical Microsystems X, 825110 (14 February 2012); https://doi.org/10.1117/12.910358

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