Development of a gas micro-preconcentrator for the analysis of explosive traces: study and characterization of various adsorbing materials

摘要

Actually, the rapid detection of explosive agents in air has become a real need. In this context, the aim of this research work is to develop a micro-fluidic platform integrated on a silicon substrate for the monitoring of explosive traces in air. This platform is composed by a micro-preconcentrator followed by a chromatographic micro-column and a tin oxide- based sensor. The target molecule studied is the orthonitrotoluene (ONT) known as a simili vapor of trinitrotoluene (TNT). The present study is focused on the gas micro-preconcentrator performances, and in particular on the choice of the adsorbent. Various adsorbents such as activated carbons, polymer and hydrophobic zeolite were then studied in order to identify the best material to be used in the gas preconcentrator.