A paper-based all organic ion sensor

Johannes Kofler; Sebastian Nau; Emil J. W. List-Kratochvil

doi:10.1117/12.2187546

4 September 2015 A paper-based all organic ion sensor

Johannes Kofler, Sebastian Nau, Emil J. W. List-Kratochvil

Proceedings Volume 9568, Organic Field-Effect Transistors XIV; and Organic Sensors and Bioelectronics VIII; 95681L (2015) https://doi.org/10.1117/12.2187546
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

Abstract

Using a so called pulsetrode concept and two identical ion selective electrodes (ISEs), the concentration of alkali metal ions can be measured without using a reference electrode. This measurement method was demonstrated recently, using all organic ISEs which have been fabricated by simplest means on a plain sheet of paper. Though, this low-cost, all organic ion sensing platform exhibited excellent stability over three months, it required a time consuming conditioning prior to measurement (>1 h). Here, we present a new measurement method which employs a square wave current rather than a single current pulse which is followed by a long regeneration time. This method reduces the conditioning time to 6 minutes, using the same low-cost sensing platform. Furthermore, after the initial conditioning, a quasi continuous measurement is possible. Additionally, using ISEs with different surface areas, a low-cost and simple threshold sensor is demonstrated.

Citation Download Citation

Johannes Kofler, Sebastian Nau, and Emil J. W. List-Kratochvil "A paper-based all organic ion sensor", Proc. SPIE 9568, Organic Field-Effect Transistors XIV; and Organic Sensors and Bioelectronics VIII, 95681L (4 September 2015); https://doi.org/10.1117/12.2187546

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