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Reference : UMR6283-JEABAR-001
Workplace : LE MANS
Date of publication : Wednesday, October 30, 2019
Scientific Responsible name : Jean-François Bardeau
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 December 2019
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The constant release of pollutants into the environment and their presence in the food chain pose a threat to the equilibrium state of our ecosystems and human health. Long-term water quality management has become a new ecological and societal issue. Water analysis requires today the development of innovative, specific and sensitive advanced technologies for the detection and quantification of diluted substances in complex environments. For this purpose, we developed and recently patented an alternative structuring methodology to elaborate SERS (Surface-Enhanced RAMAN Spectroscopy) substrates based on soft lithography. The discriminating advantage of the methodology is based on the control and reproducibility of the nanostructured patterns as well as the stability over time and under irradiation of the exaltation factors.
The first part will consist in studying the optical responses of different nanostructures elaborated on the same metallic substrates in order to determine what types of 3D architecture can ensure both an efficient and selective exaltation of the RAMAN signal in the visible range [400, 780 nm]. By simulation, we will estimate and predict the variation of the exaltation factor of the electric field for different types of nanostructure induced by the excitation (under illumination) of the plasmons on metallic surfaces. These theoretical results will be then confronted with experimental results acquired by experts at CEA (SPEC, Saclay) by photoemission electron microscopy (PEEM), a unique high spatial resolution mapping technique allowing to reveal the distribution of the near-optical field at the nanoscale. The combination of these approaches will allow a direct selection of geometry designs to validate the concept of detection of low concentrated single model molecules then several pollutants (pesticides, emerging pollutants) in mixtures at different concentration ranges using a single SERS sensor.
* Equipe PIMS de l'Institut des Molécules et Matériaux du Mans - IMMM UMR CNRS 6283 (Le Mans Université)
* Service de Physique de l'Etat Condensé (SPEC)– IRAMIS-CEA Saclay
Constraints and risks
Profile of applicant:
The candidate must have a Master 2 or an engineering degree in Physics/Optics or Material Science with a pronounced motivation for experimental work in different teams.
Given the project, skills in optical microscopy, AFM, Raman imaging and spectral analyses will be highly appreciated.
The position is located in Le Mans but the PhD student will spend a few month at the Saclay site.
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