Ionic gel based carbon dioxide gas sensor

We propose a CO
₂
gas sensor based on an impedance change of ionic gel (IG) according to the CO
₂
gas concentration. The sensor consists of an IG film patterned on electrodes. The impedance of the IG changes when the IG absorbs CO
₂
gas. CO
₂
gas concentration can be detected by measuring the amount of impedance change. Our proposal sensor has a merit that power consumption is very low (<;1μW). It is because ionic liquid (IL) and IG have selective gas solubility and high impedance. The high impedance means that large current is not required for the measurement.