Enhancing CO₂ sensitivity of a polymer-based RF sensor through functionalization
Résumé
In this study, we present a dual Radio Frequency
sensor coupled with a polymer sensitive material for Carbone
dioxide gas detection. A commercially available polymer
underwent functionalization to produce a derivative polymer
with enhanced properties. The sensing performances of both
polymers, when integrated with the RF transducer, were
evaluated. The results demonstrate that functionalization led
to an increased sensitivity to CO2 while simultaneously
reducing sensitivities to relative humidity (%RH) and
temperature. The functionalized material exhibited good
reversibility and repeatability, displaying a sensitivity of 17.3
MHz/ppm to CO2 at 0% RH, in comparison to the commercial
polymer with a sensitivity of 1.35 MHz/ppm. Nevertheless, it is
important to note that the sensor's CO2 sensitivity is
compromised when exposed to %RH levels exceeding 0.
Moreover, the sensor demonstrated a high specificity during
tests involving alternative gaseous compounds such as CO,
NO2, and O3.
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