In this paper, a preconcentrator-based sensor &mgr;-system for low level benzene detection is presented. It consists of a
spiral-shaped &mgr;-reconcentrator with dimensions of 10cm × 300&mgr;m × 300&mgr;m, followed by a &mgr;-hotplate sensor matrix. The
&mgr;-preconcentrator was fabricated on a silicon wafer by means of DRIE and anodic bonding techniques. To obtain the
concentration factor of the fabricated devices, a GC/MS: Shimadzu-QP5000 equipment was used. The results obtained
showed excellent repeatability and preconcentration factors up to 286. A considerable improvement (1500%) in the
sensor responses was achieved with Pd doped SnO2 sensors. The small size of the manufactured devices enables their
incorporation in an integrated GC/MS gas sensor system.
The development of an integrated gas chromatographic system using micro and nanotechnologies is presented in this
paper. For this purpose, the different components of the chromatographic system, namely the preconcentrator, the
chromatographic column and the gas sensors are being investigated and developed, and the actual state of this
investigation is presented. The proposed target application comes from the agrofood industry, in particular the
determination of the fish freshness. The structure of the preconcentrator has been fabricated using deep reactive ion
etching (DRIE). The same fabrication technique has been employed for the patterning of the silicon microcolumns,
which have been sealed with Pyrex glass. Inlet and outlets have been connected and initial experiments of
functionalization have been performed. Gas sensors have been obtained by microdeposition of doped WO3 or SnO2
nanomaterials on microhotplates and their responses to the gases of interest have been measured, proving that the target
gas concentrations can be detected.
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