Dresden 2011 – scientific programme
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BP: Fachverband Biologische Physik
BP 12: Posters: New Technologies
BP 12.5: Poster
Monday, March 14, 2011, 17:15–20:00, P3
Interdigitated micro-electrode arrays used as biosensors — •alireza mousavi1,2, patriza lamberti2, vincenzo tucci2, and veit wagner1 — 1Jacobs University Bremen, Campus Ring 1, D-28759, Bremen, Germany — 2University of Salerno, Dept. of Electrical and Information Engineering, 84084, Fisciano,Salerno, Italy
Detection of bio-molecules and pathogens by a rapid, sensitive and cost-effective method is of great importance in healthcare, food industry, water/environmental monitoring and for elimination of bio-security threats. In this contribution various interdigitated micro-electrode array designs are tested for their functionality as biosensors. Such electrode arrays have the advantage of low cost, low power consumption and miniaturized structure size. Test devices are fabricated either on silicon wafers or on low cost PET-foils. The adsorbates to be sensed are detected in two ways, i) by their specific dielectric signature via impedance measurements at different frequencies, and ii) by measuring the conductivity change in an additionally deposited, semiconducting surface layer patterned on top of the electrodes (field-effect transistor design). Both concepts allow label-free detection of adsorbed bio-molecules or cells. The experimental finding of the dependence on the geometry parameters of the interdigitated micro-electrode array and the electrical operation conditions are compared with predictions based on electrostatic and electroquasistatic theoretical finite-element analysis.