The goal of the project is to determine concentration of polycyclic aromatic hydrocarbons (PAHs) in surface waters. The resolution of the sensor to be deployed on-field has to be sufficient to detect trace amounts of PAHs (typically down to 10 ng.L-1). So far, no transportable system on market has reached the required resolution. Combined use of silicon nanowires and microscale pre-concentrators (from liquid to gaseous phase) has been identified recently as a promising solution to achieve this low resolution objective. Within the environment of CEA-LETI, the postodoctoral associate will take in charge electrical characterization of previously developed and fabricated nanostructures. His mission will be first to quantify noise levels, identify noise sources and characterize the nanowires thermoelectrical response to calibrated flows of gaseous mixes. In a second time the nanowires sensors will have to be integrated within the complete water analysis platform prototype already fabricated. Provided to this complete system, the postdoctoral associate will determine PAH concentrations within actual water samples from different geographical origins. Concentration measurements will have to be studied and optimized regarding different parameters such as sample injection pressure and desorption temperature. Aiming at reaching maximum performances for the sensors, the postdoctoral associate

This position is open until it is filled.

Département: Département Composants Silicium (LETI)
Laboratory: Laboratoire Composants Micro-Capteurs
Start Date: 01-06-2014
ECA Code: PsD-DRT-15-0022
Contact: thomas.alava@cea.fr

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