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Vol. 185, Issue 2, February 2015, pp. 156-161




On the Usage of Cyclic Voltammetry and Impedance Spectroscopy for Measuring the Concentration
of Aqueous Solutions

Manuel Fiedler, Ingo Tobehn, Andrea Cyriax, Heike Wünscher, Arndt Steinke, Thomas Frank

Mikrosensorik und Photovoltaik GmbH, Konrad-Zuse-Straße 14, 99099 Erfurt, Germany
Tel.: +49 361 663 1410, fax: +49 361 663 1413

E-mail: cis-mems@cismst.de


Received: 14 November 2014 /Accepted: 15 January 2015 /Published: 28 February 2015

Digital Sensors and Sensor Sysstems


Abstract: This article describes sensors for concentration measurement based on the electro- chemical properties of the liquid being measured. Herein two electrical methods, namely cyclic voltammetry and impedance spectroscopy, are being presented. The measurement can be performed quasi simultaneously using the same measurement medium. Further optimization of the combined methods is possible by adapting the geometric design of the electrode structure, the electrode material, the optional passivation and the electric coupling (galvanically or capacitively). In summary, by combining multiple sensory principles on a device it becomes possible to analyze mixtures of substances contained in a solution with respect to their composition.


Keywords: Interdigital structure, Impedance spectroscopy, Cyclic voltammetry, Silicon.


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