Nowadays, the gas sensors for carbon dioxide (CO₂) generally have the drawbacks of complex material preparation, high working temperature and depending on external power supply, which limits its application in the Internet of things (IoT). Here, a self-powered CO₂ gas sensor is developed based on the gas discharge induced by the triboelectric nanogenerator (TENG). As CO₂ is added into N₂, the negative CO₂ ions produced in the discharge process will obstruct the formation of plasma, which increases the threshold voltage of gas discharge and changes the discharge characteristics. Based on these phenomena, different kinds of CO₂ gas sensing modes are proposed. The first mode is threshold concentration detection mode, in which the gas discharge will be disappeared as the concentration of CO₂ reaches a threshold value. Through adjusting the distance between two discharge electrodes, the detectable threshold concentrations can be regulated from 1000 to 200,000 ppm. Based on the dependence of discharge frequency and discharge current on the CO₂ concentration, the step mode and continuous detection mode are proposed, which can be used to detect the gas concentrations of CO₂ lower than the threshold concentration. The TENG-based self-powered CO₂ gas sensor operates at room temperature, has high detection sensitivity and requires no external power supply, which has potential applications for constructing self-powered gas sensing networks oriented to IoT.

如今，用于二氧化碳（CO ₂）的气体传感器通常具有制备材料复杂，工作温度高以及依赖于外部电源的缺点，这限制了其在物联网（IoT）中的应用。在此，基于由摩擦电纳米发电机（TENG）引起的气体放电，开发了一种自供电的CO ₂气体传感器。当将CO ₂添加到N _2中时，在放电过程中产生的负CO ₂离子将阻碍等离子体的形成，从而增加了气体放电的阈值电压并改变了放电特性。基于这些现象，不同种类的CO ₂提出了气体传感模式。第一模式是阈值浓度检测模式，其中当CO ₂的浓度达到阈值时气体排放将消失。通过调节两个放电电极之间的距离，可以将可检测的阈值浓度调节为1000至200,000 ppm。基于放电频率和放电电流对CO ₂浓度的依赖性，提出了分步模式和连续检测模式，可用于检测低于阈值浓度的CO ₂气体浓度。基于TENG的自供电CO ₂ 气体传感器在室温下运行，具有很高的检测灵敏度，并且不需要外部电源，这对于构建面向物联网的自供电气体传感网络具有潜在的应用。