Operation mechanism of n-type organic electronic metabolite sensors

Victor Druet^a, Prem Nayak^a, David Ohayon^a, Anil Koklu^a, Sahika Inal^a, Xingxing Chen^b, Maximilian Moser^c, Iain McCulloch^b^,^c

^aKing Abdullah University of Science and Technology (KAUST), Biological and Environmental Science and Engineering (BESE) Division, Thuwal 23955-6900, Saudi Arabia

^bKing Abdullah University of Science and Technology, Physical Sciences and Engineering Division, KAUST Solar Center, 23955, Thuwal, Saudi Arabia

^cDepartment of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, OX1 3TA

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#OMIECs22. Organic mixed-ionic-electronic conductors and their application in Emerging Technologies

Online, Spain, 2022 March 7th - 11th

Organizers: Aristide Gumyusenge and Alexander Giovannitti

Contributed talk, Victor Druet, presentation 314
DOI: https://doi.org/10.29363/nanoge.nsm.2022.314
Publication date: 7th February 2022

When combined with oxidase enzymes, the NDI-T2 based electron transporting (n-type) polymer led to high performance metabolite sensors, yet their working mechanism has been poorly understood.[1], [2] By monitoring oxygen, hydrogen peroxide, and pH changes in the electrolyte surrounding the n-type channel and gate as well as the potential of each electrical contact in the transistor, we shed light on the catalytic events occurring at the polymer-enzyme interface. We show that in its doped sate, the n-type film performs oxygen reduction reaction and that the n-OECT characteristics are sensitive to oxygen. We find a correlation between the amount of dissolved oxygen and the n-OECT sensor current generated during the metabolite oxidation and that using the n-type polymer at the gate electrode is critical for sensor operation. Our results show the importance of in operando analysis for understanding polymer-catalytic enzyme activity, as well as the importance of ambient oxygen in the operation of n-type devices.

References:

[1] Pappa, A. M.; Ohayon, D.; Giovannitti, A.; Maria, I. P.; Savva, A.; Uguz, I.; Rivnay, J.; McCulloch, I.; Owens, R. M.; Inal, S., Direct metabolite detection with an n-type accumulation mode organic electrochemical transistor. Science advances 2018, 4 (6), eaat0911.

[2] Ohayon, D.; Nikiforidis, G.; Savva, A.; Giugni, A.; Wustoni, S.; Palanisamy, T.; Chen, X.; Maria, I. P.; Di Fabrizio, E.; Costa, P. M., Biofuel powered glucose detection in bodily fluids with an n-type conjugated polymer. Nature materials 2020, 19 (4), 456-463.

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