Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Charged Soft Matter, Polyelectrolytes and Ionic Liquids I
CPP 17.9: Vortrag
Dienstag, 19. März 2024, 12:00–12:15, H 0107
Microfabricated Poly (Ionic Liquid) Based Electrochemical Oxygen Sensors for Modified Atmosphere Packaging — •Zoë Siebers, Alexey Yakushenko, Ryan Guterman, Maksim Bahdanchyk, Stefan Popović, Dejan Šegan, Petr Vlasov, and Qiang Wang — FaradaIC Sensors GmbH, Richard-Wagner-Straße 23, 10585 Berlin
The large size and high cost of current state-of-the-art oxygen sensors is the main impediment preventing millions of O2-sensors entering the Internet of the things (IoT) market. This includes the monitoring of millions of bulk packages of perishable food being transported across the planet under a modified or controlled atmosphere (MAP).
The key to miniaturization and mass fabrication of electrochemical amperometric O2-sensors is microfabrication. To reach such a goal, new special types of polymerized ionic liquid (poly (ionic liquid), PIL) electrolytes have been developed. These PILs are unique as they maintain high enough ionic conductivity after photopolymerization (up to 5 × 10−5 S/cm (24 ∘C)) and combine gas sensitivity with photopatternability within a single substance.
With these novel materials, we have developed the first fully microfabricated sensor for electrochemical O2 sensing. With a size of 2 mm x 2 mm x 1 mm it is > × 100 more compact than commercial sensors.
We show that this sensor can be used to reliably measure O2 concentrations in the specific conditions found in MAP (0-21 % O2, 0−95 % relative humidity). An optimized readout algorithm is introduced to increase signal stability and sensor regeneration.
Keywords: microfabrication; gas sensing; (poly)ionic liquids; electrochemistry; MEMS