Hyodo Takeo, Shimizu Yasuhiro
Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, 852-8521, Japan.
Anal Sci. 2020 Apr 10;36(4):401-411. doi: 10.2116/analsci.19R011. Epub 2020 Feb 14.
Highly sensitive and selective detection of various volatile organic compounds (VOCs) has been most needed in a wide range of fields, such as medical diagnosis, health supervision, industry-process control, and environmental monitoring. Since a semiconductor-type gas sensor is a typical promising candidate among various portable VOC-sensing devices, many efforts on developing these gas sensors are introduced in this article for the first time. Through some development stages, it has been well known that the temperature-modulated operation of gas sensors is one of effective ways to improve the magnitude of VOC responses. On the other hand, catalytic combustion-type gas sensors operated with a mode of pulse-driven heating were developed in the early 2000s, and they are named as "adsorption/combustion-type gas sensors" after their gas-sensing mechanism, based on the combustion of VOC adsorbates on the sensing material. The representative VOC-sensing properties of the adsorption/combustion-type gas sensors and recent material-design approach to achieve highly sensitive and selective VOC detection are summarized in this article.
在医学诊断、健康监测、工业过程控制和环境监测等众多领域，对各种挥发性有机化合物（VOCs）进行高灵敏度和高选择性检测的需求极为迫切。由于半导体型气体传感器是各类便携式VOC传感设备中极具潜力的典型候选者，本文首次介绍了在开发这些气体传感器方面所做的诸多努力。经过一些发展阶段，众所周知，气体传感器的温度调制操作是提高VOC响应幅度的有效方法之一。另一方面，脉冲驱动加热模式运行的催化燃烧型气体传感器于21世纪初得到发展，基于传感材料上VOC吸附物的燃烧，根据其气敏机制，它们被命名为“吸附/燃烧型气体传感器”。本文总结了吸附/燃烧型气体传感器的代表性VOC传感特性以及实现高灵敏度和高选择性VOC检测的最新材料设计方法。
