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Développement d'un micro-préconcentrateur pour la détection de substances chimiques à l'état de trace en phase gaz

Abstract : In the field of gas detection, one major trend is to miniaturize analytical techniques. In such technological developments, the gas pre-conditioning is usually very important. This may involve, firstly, the modification of a gas mixture, for example to improve the selectivity of a detection device, secondly, the effect of preconcentration in order to increase the sensibility of the detector. Indeed, in some applicative environments the concentration of gas is too small and therefore a preconcentration unit at the entrance of the analytical device is needed. When a preconcenrator is used, the gas mixture to be analyzed flows through it and is accumulated during some time, then the mixture is desorbed by a temperature pulse and brought to the detector. This work presents the development of a gas preconcentrator based on a micro-channel in porous and non-porous silicon filled with an adequate adsorbent material by micro-fluidic process in open micro-device or by impregnation in close one. The particularity of this device is its applicability in the fields of atmospheric pollution monitoring (Volatiles Organic Compounds-VOCs) and explosives detection (nitroaromatic compounds). Various designs of micro-devices have been investigated and a special focus has been dedicated to the carbon adsorbent. The optimization of the device and its operation were driven by its future application in outdoor environments. The benefits of using porous silicon to ease the fixing of the carbon absorbent in the reactor and to modify the gas desorption kinetic are also investigated.
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Submitted on : Wednesday, January 20, 2010 - 4:05:06 PM
Last modification on : Wednesday, June 24, 2020 - 4:18:31 PM
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  • HAL Id : tel-00448980, version 1


El Hadji Malick Camara. Développement d'un micro-préconcentrateur pour la détection de substances chimiques à l'état de trace en phase gaz. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne; Université de Neuchâtel, 2009. Français. ⟨tel-00448980⟩



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