Abstract
The steadily increasing concentration of carbon dioxide (CO
2
) gas in the atmosphere is a significant environmental problem in modern society. Henceforth, there is triggering interest in the new technological solutions for CO
2
monitoring. This work reports the fabrication of a novel, low cost, chemiresistive carbon dioxide sensor based on the PVA/[EMIM][SCN] based ionogel membrane. Here, the lightweight transparent ionogel membrane with enhanced ionic conductivity is acted as the electrically conductive region of the sensor. The response rate of the CO
2
sensor was monitored in terms of direct as well as alternating current resistance using a high-precision multimeter and an impedance spectroscopy, respectively. The CO
2
desorption kinetics were also studied to check the reliability of the sensor using the conductometric approach. The selectivity of the sensor for CO
2
gas was well evidently quantified by comparing the response rate of the sensor with both CO
2
and N
2
gases. The optical microscopic images were periodically taken before and after CO
2
exposure in conjunction with the conductivity data revealed the physisorption mechanism of the sensor. The upshots presented herein will promote the development of an organic CO
2
gas sensor, which will be worthwhile for numerous industrial and practical applications and for air quality control in the future.