Room Temperature Ionic Liquid based Robust Electrochemical CO2 Sensor
The need for gas sensors that operate at low power, high stability, and increased sensitivity has grown. For this study, we report the effects humidity has on selected room temperature ionic liquids (RTILs) for sensing changes in CO2 concentrations. We have investigated two different fluorinated RTILs with anions that have different chemical symmetries. The CO2 concentrations were varied from 400 ppm to 1000ppm on gold interdigitated electrodes on printed circuit boards (PCBs). The humidity was varied from 25% to 65% relative humidity in addition to the CO2 variation. Utilizing electrochemical impedance spectroscopy (EIS) the variations in the system capacitance due to these changes were measured. Performance comparison was based on the capacitive response and dynamic behavior of the system based on the changes in the anionic symmetry. This investigation has aided in identifying the more robust and stable performer in addition to the next set of investigations for these materials.
|Texas Analog Center of Excellence and Analog/Mixed-Signal Circuits, Systems and Devices Review|
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