Low-power-consumption CO2 gas sensor using ionic liquids for Green energy management

We propose a low-power-consumption CO2 gas sensor using ionic liquids. We use ionic liquids of imidazolium salts, EMIMBF4, EMIMTFSI and BMIMHFA. The impedance of the ionic liquids decreases along with increase of the CO2 gas concentration. By measuring the impedance of the ionic liquids, we could estimate the CO2 gas concentration of the atmosphere. This experiment showed that measurement resolution of our proposed sensor was 100 ppm and, the power consumption was several tens of microwatts and this value is 1/1000 smaller than the conventional CO2 gas sensors ( NDIR and Solid state electrolyte cell). We expect as a candidate of very low power consumption CO2 sensor suitable for green energy management.