Semiconducting metal oxide-based
gas sensors have inadequate selectivity
as they are responsive toward a variety of gases. Here, we report
the implementation of gas sensing kinetic analysis of the sensor to
identify the tested volatile organic compounds (VOCs) (2-propanol,
formaldehyde, methanol, and toluene) precisely. A single chemiresistive
sensor was employed having tin oxide-based hollow spheres as the sensing
material, which were obtained by chemical synthesis. The gas sensing
measurements were conducted in a dynamic manner where the sensor displayed
excellent response with high sensitivity. Eley–Rideal model
was adopted to obtain the kinetic properties of the gas sensing phenomenon
through theoretical fitting of response transient curves and their
corresponding kinetic parameters. The calculated characteristic kinetic
properties were further examined to discriminate among different VOCs.
The approach of using gas sensing kinetic analysis for multiple gas
discrimination is an attractive solution to mitigate the problem of
cross-sensitivity for resistive gas sensors.
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