Overview on conductometric solid-state gas dosimeters
Overview on conductometric solid-state gas dosimeters
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DOI：
10.5194/jsss-3-29-2014
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发表时间：
2014-01-01
影响因子：
1
通讯作者：
Moos, R.
中科院分区：
文献类型：
--
作者：
Marr, I.;Gross, A.;Moos, R.
本文的目的是介绍近年来越来越受到关注的电导固体剂量计型气体传感器的工作原理，并对有前途的材料进行文献综述。与普通气体传感器相反，气体剂量计适用于直接检测剂量（也称为分析气体的量或累积或综合暴露），而不是实际的分析物浓度。因此，气体剂量计特别适用于主要关注平均值的低水平应用。所应用的材料能够通过分析物分子在敏感层中的选择性积累来改变其电性能。累积或剂量计型传感原理是一种可靠、快速和长期检测低分析物水平的有前途的方法。与普通的气体传感器相比，文献中很少描述依靠积累原理的装置。大多数剂量计类型的设备是光学的，质量敏感的（石英微天平/QMB，表面声波/SAW），或场效应晶体管。然而，本文的重点是固态气体剂量计，它可以通过测量电导率或阻抗来直接读出，这两者都是基于材料的变化（在理想材料中有选择性地）其电导率或介电特性随气体负载的变化。本文还概述了累积传感原理的不同工作模式及其独特的特点。
The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.