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3.5.4 Multiparametric Microsensors on Labonchip Systems for the Detection of Dissolved Substances

Event
14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
Chapter
3.5 ISFETs
Author(s)
Y. Eminaga, M. Brischwein, H. Grothe, B. Wolf - einz Nixdorf-Lehrstuhl für Medizinische Elektronik, Technische Universität München (Germany), J. Wiest - cellasys GmbH - R&D (Germany)
Pages
316 - 318
DOI
10.5162/IMCS2012/3.5.4
ISBN
978-3-9813484-2-2
Price
free

Abstract

A microsensor chip fabricated in silicon technology was developed at the Heinz Nixdorf-Lehrstuhl für Medizinische Elekronik at Technische Universität München. This BioChip contains microsensors for measurement of pH, dissolved oxygen, bioimpedance and temperature. Furthermore it was possible to realize a new sensor for dissolved redox active substances. Using a noble metal electrode (NME) surrounding an ISFET (ion sensitive field effect transistor) pH-sensor it was possible to measure dissolved oxygen concentration indirectly via the resulting change in the pH value when applying −700mV at the NME. The concept of this O2-FET was extended successfully also for measuring other dissolved redox-active substances, using a cyclovoltammetric (CV) scanning mode. With this approach of a so called CV-FET sensor, dissolved substances can be detected according to their specific CV patterns.

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