A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

基于PDMS/Ppy摩擦气体传感阵列的自供电式气体传感器用于室温实时监控尾气（英文）

A new self-powered active gas sensor for realtime monitoring of automotive exhaust gas was devised.The pipe-shaped device was fabricated from polydimethylsiloxane/polypyrrole(PDMS/Ppy)triboelectric gas-sensing unit arrays.The gas-sensing units can actively convert the mechanical energy of gas flow into a triboelectric current.The output current signal depends on the species and concentrations of the target chemical gases(CO,NH3,NO)in the gas flow,and thus can be used as a sensing signal.The device consists of seven gas-sensing units with different Ppy derivatives.As the different sensing units respond to the gases in different ways,the device can differentiate between gas species.The working mechanism is attributed to the coupling effect between the triboelectric effect of PDMS/Ppy and the gas-sensing properties of Ppy.The device can be installed in the tailpipe of an automobile,and can thus analyze the exhaust gas in real time without the need for any external electrical power.The results of the present study spur a new research direction for the development of automotive exhaust gas monitoring systems,thus playing an important role in the detection of air pollution.

本文提出了一种用于汽车尾气实时监测的新型自供电式气体传感器.这种管形器件由聚二甲基硅氧烷/聚吡咯(PDMS/Ppy)摩擦-气体传感单元阵列组成.摩擦-气体传感单元可以直接将气流的机械能转换为电能并输出摩擦电流.输出电流的信号强度取决于气流中目标化学气体(CO、NH3、NO)的种类和浓度,因此这种输出电流可以同时作为传感信号.这种自供电气体传感器将纳米发电机和气体传感器集成于单一器件,在一个物理过程中同时实现摩擦发电和气体传感,进而实现了自供电式气体传感器.该装置可固定在汽车排气管处,无需外接电源即可对废气进行实时分析.这一工作为汽车尾气监测系统的发展开辟了新的研究方向,将在大气污染的检测方面起到重要作用.