A novel ion selective gas sensor based on pulsed atmospheric pressure chemical ionization and ion-ion-recombination
A novel ion selective gas sensor based on pulsed atmospheric pressure chemical ionization and ion-ion-recombination
复制标题
DOI：
10.1016/j.snb.2017.02.086
复制
发表时间：
2017-07-01
影响因子：
8.4
通讯作者：
Zimmermann, S.
中科院分区：
文献类型：
--
作者：
Heptner, A.;Reinecke, T.;Zimmermann, S.
在之前的一项研究中，我们使用配备脉冲电子发射器的离子迁移谱仪研究大气压下的离子生成和离子-离子复合动力学，我们发现仅考虑特定的离子-离子复合动力学就可以区分不同的离子种类和浓度。在目前的工作中，这些发现被用于开发一种新颖的紧凑且简单的气体传感器。在第一步中，气体混合物通过大气压化学电离在规定的电离时间内被电离。随后关闭电离源并测量作为重组时间的函数的离子浓度的离子特异性衰减。这种衰减分别取决于生成的离子种类和气体混合物的化合物。为了分析这些衰减曲线和结果的可视化，我们使用判别分析。作为示例性目标分析物，我们选择甲基膦酸二甲酯 (DMMP)。利用当前设置，仅考虑重组动力学，在氨和甲醛浓度显着升高的情况下，我们可以实现 8 ppb(v) 的 DMMP 检测限。 (C) 2017 Elsevier B.V. 保留所有权利。
In a former work on the investigation of ion generation and ion-ion recombination kinetics at atmospheric pressure with an ion mobility spectrometer equipped with a pulsable electron emitter, we found that different ion species and concentrations could be distinguished by only considering the specific ion-ion recombination kinetics. In the present work, these findings are utilized for the development of a novel compact and simple gas sensor. In a first step, the gas mixture becomes ionized by atmospheric pressure chemical ionization for a defined ionization time. Subsequently the ionization source is turned off and the ion specific decay of the ion concentration as a function of the recombination time is measured. This decay depends on the generated ion species and the compounds of the gas mixture respectively. For the analysis of these decay curves and visualization of the results, we use discriminant analysis. As an exemplary target analyte, we chose dimethyl-methylphosphonate (DMMP). With the current setup we achieve a limit of detection of 8 ppb(v) for the detection of DMMP in presence of significant higher ammonia and formaldehyde concentrations by only considering the recombination kinetics. (C) 2017 Elsevier B.V. All rights reserved.