A Light-Activated Micropower Gas Sensor for the Detection of NO2 Down to the Parts Per Billion Range

Based on the recently reported "micro-light-plate" configuration, we have implemented a light activated gas sensor for NO
₂
operating at room temperature. With this conductometric device, we achieved detection limits down to a few parts per billion (ppb) with power consumption in the tens of microwatt range (μW). These are record values for conductometric metal-oxides (MOX) sensors activated with light (instead of heat).