Gas sensors based on membrane diffusion for environmental monitoring

SENSORS AND ACTUATORS B-CHEMICAL

卷:243

Article

Li, Tianling¹  Wu, Yonghong²  Huang, Jianyin¹  Zhang, Shanqing¹ 

[1] Griffith Univ, Sch Environm, Ctr Clean Environm & Energy, Environm Futures Res Inst, Gold Coast Campus, Southport, Qld 4222, Australia

[2] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, 71 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China

关键词: Membrane separation;    Gas diffusion;    Gas sensing techniques;    Real-time;    Environmental monitoring;   

DOI  :  10.1016/j.snb.2016.12.026

来源: Elsevier

【 摘 要 】

Over the last few decades, gas membrane diffusion has been applied to elaborate chemical analyses, leading to the development of a series of gas sensing techniques for environmental monitoring. This work reviews the gas sensors that incorporate the gas membrane diffusion mechanism with either electrochemical or optical transducers, and concludes the theoretical relationship between the detection signal and the mass transfer parameters across the membrane, such as membrane thickness, gas diffusion coefficient and driving force. It also envisages that, with the availability of modern electronic and computing technology, the in -situ membrane diffusion rate of a target species is proportional to its real-time concentration in the sample and can be readily measured. Such a measuring principle is promising in developing the next generation of gas sensors based on membrane diffusion to achieve real-time and continuous monitoring of important trace gases (e.g. CO2, SO2, NH3) in the natural environment (water, soil and air). (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free