Ecole Nationale Supérieure des Mines, Centre SPIN, LPMG-UMR CNRS 5148, 158 Cours Fauriel, 42023 Saint-Etienne, France.
Anal Chim Acta. 2011 Mar 4;688(2):175-82. doi: 10.1016/j.aca.2010.12.039. Epub 2011 Jan 14.
This paper presents the optimization of a micro gas preconcentrator based on a micro-channel in porous and non-porous silicon filled with an adequate adsorbent. This micro gas preconcentrator is both applicable in the fields of atmospheric pollution monitoring (Volatil organic compounds--VOCs) and explosives detection (nitroaromatic compounds). Different designs of micro-devices and adsorbent materials have been investigated since these two parameters are of importance in the performances of the micro-device. The optimization of the device and its operation were driven by its future application in outdoor environments. Parameters such as the preconcentration factor, cycle time and the influence of the humidity were considered along the optimization process. As a result of this study, a preconcentrator with a total cycle time of 10 min and the use of single wall carbon nanotubes (SWCNTs) as adsorbent exhibits a good preconcentration factor for VOCs with a limited influence of the humidity. The benefits of using porous silicon to modify the gas desorption kinetics are also investigated.
本文提出了一种基于多孔和无孔硅中填充适当吸附剂的微通道的微型气体预浓缩器的优化。这种微型气体预浓缩器既适用于大气污染监测（挥发性有机化合物-VOCs）领域，也适用于爆炸物检测（硝基芳香族化合物）领域。由于这两个参数对微器件的性能至关重要，因此已经研究了不同的微器件设计和吸附剂材料。该器件及其操作的优化是由其未来在户外环境中的应用驱动的。在优化过程中考虑了预浓缩因子、循环时间和湿度的影响等参数。作为这项研究的结果，一种总循环时间为 10 分钟的预浓缩器，使用单壁碳纳米管（SWCNTs）作为吸附剂，对 VOCs 表现出良好的预浓缩因子，湿度的影响有限。还研究了使用多孔硅来改善气体解吸动力学的好处。
