Simultaneous Detection of Mixed-Gas Components by Ionic-Gel Sensors with Multiple Electrodes

T Tanaka and Y Hamanaka and T Kato and K Uchida, ACS SENSORS, 7, 716-721 (2022).

DOI: 10.1021/acssensors.1c02721

The sensing of gas components in a mixed gas is required forbreath-based health monitoring and diagnosis. In this work, we report thesimultaneous detection of mixed-gas components using a sensor consistingof EMIMBF4-based ionic gel with four electrodes made of Au, Pt, Rh,and Cr. The voltage between any given pair of electrodes depends on the gasmolecules absorbed in the ionic gel and the elements the electrodes aremade of. When the voltage signals between all pairs of electrodes were used,H2,NH3, and C2H5OH concentrations were simultaneously estimated by aneural-network-based inference. From molecular dynamics simulations, theorigin of the voltage signal was attributed to the catalytically generatedadsorbates on the electrodes.

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