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Reference : UMR6502-PIETES-003
Workplace : NANTES
Date of publication : Thursday, November 07, 2019
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 6 January 2020
Proportion of work : Full time
Remuneration : about 2640 € monthly gross salary
Desired level of education : PhD
Experience required : Indifferent
The recruited researcher will focus mainly on the synthesis of new types of nanoporous gold substrate for the detection of molecular species by SERS [Bouvree-2013]. The objective is to obtain robust and reproducible sensitivities lower than 10-11 mol / L. The first recent results made in the laboratory with 2 model molecules, bipyridine and naphthalene thiol, on this type of substrate give promising results but require further optimization of nanostructured gold layers using novel approaches combining the deposition of thin layers of AuCu alloys and the chemical process of copper de-alloying. These approaches lead to a control of the porosity and the architecture of the material [Chauvin-2016]. The challenge is to develop architectures and morphologies of layers that will accentuate the effect of exaltation to reach the targeted sensitivities. Significant experimental work will be required both to fabricate the substrates and to determine the good excitation conditions of the Raman signals. Finally, based on the results obtained during this project, the researcher will start thinking about the design of a first prototype SERS portable detection system.
[Bouvree-2013] A. Bouvrée, A. D_Orlando, T. Makiabadi, S. Martin, G. Louarn, J. Y. Mevellec and B. Humbert, Gold Bulletin, (2013) “Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy” (DOI 10.1007/s13404-013-0127-4)
[Chauvin-2016] A. Chauvin et al. « Planar Arrays of Nanoporous Gold Nanowires: When Electrochemical Dealloying Meets Nanopatterning” ACS Appl. Mater. Interfaces 2016, 8, 6611−6620 (DOI: 10.1021/acsami.5b11244)
Optimization of the synthesis of gold supports made by magnetron cathode sputtering of gold and copper targets in argon plasma followed by a chemical copper dealloying. Different types of nanostructured silicon surfaces by lithography will also be evaluated as a substrate for nanoporous gold deposition.
Characterization of the layers and supports made (electron microscopy, profilometry, AFM, EDS, XPS)
SERS performance evaluations by testing the plasmonic responses of the substrates by using all near-UV to near-IR excitation wavelengths available at IMN, supplemented by polarization studies for "surfaces" nanostructured.
Thin films, physical vapor deposition (skill level).
Characterization techniques for thin films (skill level)
Raman and SERS spectroscopy (skill level)
Finite element modeling of optical properties can be a real plus on this project,
Work in the chemistry room, dealloying (basic knowledge)
Clean room techniques, silicon lithography (basic knowledge)
Ability to work in a team, autonomy, good organization and project management.
The Materials Institute is one of the leading materials research centers in France. The recruited person will interact regularly with the researchers and teacher-researchers of two laboratory teams involved in this project (PCM and PMN groups) as well as with the technical staff in charge of the synthesis and characterization equipment.
This project is financed by the RFI WISE of the “Pays de la Loire” region.
Constraints and risks
The laboratory is governed by internal rules. No specific risks other than those resulting from an experimental activity in a laboratory.
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