Dual-gate organic electrochemical transistors for marine sensing

Tse Nga Ng; Shuoen Wu; Jason Azoulay

doi:10.1117/12.2593404

3 August 2021 Dual-gate organic electrochemical transistors for marine sensing

Tse Nga Ng, Shuoen Wu, Jason Azoulay

Proceedings Volume 11811, Organic and Hybrid Field-Effect Transistors XX; 118110I (2021) https://doi.org/10.1117/12.2593404
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

With our marine ecosystems under threat from climate change, there is an urgent need to continuously monitor marine conditions. One key indicator is the dissolved oxygen level, but existing sensors are limited by size and costs that preclude widespread non-intrusive monitoring. This work reports a new dual-gate design based on organic electrochemical transistors (OECTs) to track dissolved oxygen concentration in seawater, a highly challenging matrix owing to its high ionic strength and multitude of chemical interferents. We present the novel operating principle, by deriving the channel conductance with respect to potentials on the two gates. The sensor achieved a detection limit of 0.5 ppm dissolved oxygen concentration in seawater. The device demonstrated reliable operation over five days and was capable of monitoring oxygenation changes arising from the photosynthesis cycles of saltwater macro-algae.

Conference Presentation

Citation Download Citation

Tse Nga Ng, Shuoen Wu, and Jason Azoulay "Dual-gate organic electrochemical transistors for marine sensing", Proc. SPIE 11811, Organic and Hybrid Field-Effect Transistors XX, 118110I (3 August 2021); https://doi.org/10.1117/12.2593404

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