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Internship position at École polytechnique

Principle of operation

Each sensor in the array consists of a conducting network of multi-walled carbon nanotubes (MWCNT) directly ink-jet printed on Silicon between interdigitated electrodes. The MWCNT are functionalized in liquid phase by specific molecules (conjugated polymers) selected for their capability 1) to complex reversibly and selectively the target analytes, 2) to bound noncovalently with the MWCNT 3) to ensure efficient charge transfer between target analytes and MWCNT. When the device is exposed to water containing a mixture of various species, in the absence of functionalization, most species interact with the MWCNT-based devices. In the presence of functionalized MWCNT on the contrary, the devices respond selectively to the targeted analyte thanks to the specific functionalization.

Proposed research

The proposed internship will focus mostly on extensive characterization of the sensor array in water and with various high resolution equipment (AFM, SEM, Raman, confocal microscopy, absorption and emission spectropcopies…) to quantify the selectivity between the various target analytes (pH, chlorine, nitrate, hardness, chloride), and to predict life time of the sensors in water. The work will include advanced exploitation of characterization data, including via statistical software. The internship will also include a small part of fabrication of the devices according to a well-established protocol (MWCNT ink fabrication and ink-jet printing, wire bonding of the chips).

Application and deadlines

The successful candidate will have a strong background in material sciences, especially focused toward nanomaterials devices. Fluent english (written and spoken), high proficiency in technical writing and presentations. Autonomy, spirit of initiative, decision-makingskills, creativity, team working To be considered, applications must include detailed resume, motivation letter and all available grades for the current degree being prepared. Internship duration should be at least 4 months. PhD opportunity as a follow-up

Bérengère LEBENTAL
berengere.lebental@polytechnique. edu