On the combination of porous silicon and Carbopack@ B for DNT traces preconcentration
Résumé
The development and the characterization of a preconcentrator device to determine trace levels of one of the markers of the explosive trinitrotoluene (TNT: 2,4-dinitrotoluene (2-4DNT) with a photo-ionization detector have been made. This preconcentrator is a silicon microreactor which has a deep-reactive-ion-etched (DRIE) cavity, filled with an adsorbent and a heater to monitor adsorption-desorption cycles. Different adsorbents (Tenax@, Carbon powder, Carbopack@) and also the Porous Silicon (obtained by DRIE of the Si device) have been compared by TPD analyses and adsorption/desorption cycles. The best performances for DNT preconcentration are obtained with a combination of Carbopack@B (C-B) and Porous Silicon (PS)