Design for manufacture of a micro-interdigitated electrode for impedance measurement in a biochemical assay

Linda Donoghue; Brian W. Anthony

doi:10.1117/12.910492

14 February 2012 Design for manufacture of a micro-interdigitated electrode for impedance measurement in a biochemical assay

Linda Donoghue, Brian W. Anthony

Author Affiliations +

Proceedings Volume 8251, Microfluidics, BioMEMS, and Medical Microsystems X; 82510Y (2012) https://doi.org/10.1117/12.910492
Event: SPIE MOEMS-MEMS, 2012, San Francisco, California, United States

Abstract

The performance of interdigitated electrodes for impedance measurements in a microfluidic assay chamber is dependent upon the geometric design of the electrode pattern and can be significantly impacted by variability or defects in manufacturing or materials. For processes which rely on precise electrode performance, it is necessary to minimize variation through robust design and quality control. An interdigitated electrode design was investigated to identify design strategies which maximize electrode sensitivity and minimize performance variability in produced parts, while potentially reducing the complexity of quality testing. Several configurations were developed to address these goals by increasing the sensing region for a specified electrode area and creating designs which can be easily manufactured with low variability. Design modifications included alterations to interdigitated finger orientation, finger geometry, and gap width. Test findings indicate that optimal designs contain narrow gap widths with electrode fingers parallel to the longest dimension of the electrode. These benefits may be further enhanced by replacing straight finger edges with geometrical features, such as scalloped edges. The design changes identified can be used to improve interdigitated electrode performance for an array of applications and to reduce performance variability caused by variation in the manufacturing process.

Citation Download Citation

Linda Donoghue and Brian W. Anthony "Design for manufacture of a micro-interdigitated electrode for impedance measurement in a biochemical assay", Proc. SPIE 8251, Microfluidics, BioMEMS, and Medical Microsystems X, 82510Y (14 February 2012); https://doi.org/10.1117/12.910492

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available