A Robust Electrochemical CO2 Sensor Utilizing Room Temperature Ionic Liquids

Next generation CO
₂
gas sensors require an enhancement of sensitivity and invariance with regards to CO
₂
detection and environmental factors. For this study, we report and discuss the effective application of room temperature ionic liquids (RTILs) toward the development of a stable electrochemical CO
₂
sensor that provides increased valuation toward commercial applications. We have investigated two RTILs on both gold and carbon paste electrodes on printed circuit boards over four different CO
₂
concentrations. We also have investigated another RTIL on a gold electrode for initial repeatability effects at two CO
₂
concentrations. Using electrochemical impedance spectroscopy and chronoamperometry, we compare and contrast the initial response behaviors for these RTILs for these sensors. This analysis has aided in the identification of robust combinations of RTIL/electrode toward environmental CO
₂
sensors.