The self-powered CO2 gas sensor based on gas discharge induced by triboelectric nanogenerator
The self-powered CO2 gas sensor based on gas discharge induced by triboelectric nanogenerator
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DOI：
10.1016/j.nanoen.2018.09.057
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发表时间：
2018-11
期刊：
影响因子：
17.6
通讯作者：
Ke Zhao;Guangqin Gu;Youning Zhang;Bao Zhang;Feng Yang;Lei Zhao;Mingli Zheng;G. Cheng;
中科院分区：
文献类型：
--
作者：
Ke Zhao;Guangqin Gu;Youning Zhang;Bao Zhang;Feng Yang;Lei Zhao;Mingli Zheng;G. Cheng;
目前二氧化碳气体传感器普遍存在材料制备复杂、工作温度高、依赖外部电源等缺点，限制了其在物联网中的应用。本文基于纳米摩擦电发电机（TENG）诱导的气体放电，研制了一种自供电的CO2气体传感器。在N2中加入CO2，放电过程中产生的负CO2离子会阻碍等离子体的形成，提高气体放电的阈值电压，改变放电特性。基于这些现象，提出了不同的CO2气体传感模式。第一种模式为阈值浓度检测模式，当CO2浓度达到阈值时，气体放电消失。通过调节两个放电电极之间的距离，可将可检测的阈值浓度调节为1000至200，000ppm。基于放电频率和放电电流对CO2浓度的依赖关系，提出了步进模式和连续检测模式，可用于检测低于阈值浓度的CO2气体。基于TENG的自供电CO2气体传感器可在室温下工作，检测灵敏度高，无需外接电源，在构建面向物联网的自供电气体传感网络方面具有潜在的应用前景。
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 CO2gas sensor is developed based on the gas discharge induced by the triboelectric nanogenerator (TENG). As CO2is added into N2, the negative CO2ions 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 CO2gas sensing modes are proposed. The first mode is threshold concentration detection mode, in which the gas discharge will be disappeared as the concentration of CO2reaches 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 CO2concentration, the step mode and continuous detection mode are proposed, which can be used to detect the gas concentrations of CO2lower than the threshold concentration. The TENG-based self-powered CO2gas 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.