Reference : UMR7198-MARTAI-076
Workplace : NANCY
Date of publication : Tuesday, November 22, 2022
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 February 2023
Proportion of work : Full time
Remuneration : 2.833,40€ gross salary / month
Desired level of education : PhD
Experience required : 1 to 4 years
The project deals with the analysis of the plasma in a synthesis process of nanostructures formed from a precursor which can be either maleic anhydride, allylamine or citronella.
It will be carried out in close collaboration with the partners of the Institute of Material Sciences in Mulhouse (IS2M) whose skills in the fields of plasma polymerization, surface functionalization, interfacial chemistry and photochemistry will be required to associate the results of the proposed study with the work that will be carried out on the mechanisms of nanostructures formation.
A detailed spectroscopic characterization of the different phases of the plasma according to the precursor used will be carried out at the Jean-Lamour Institute. It will be performed under different conditions of continuous and pulsed plasmas. These conditions will be selected from the results of the scientific literature and the preliminary work that has already been done. The aim of this task is to identify qualitatively and semi-quantitatively the main species present in the plasma. The following will be used:
- In-situ Fourier-transform infrared spectroscopy (FTIR) to identify the species in the plasma during polymerization.
- Time-resolved optical emission spectroscopy to access different parameters such as the densities of excited species, gas temperature, neutral and electron temperatures, etc.
- Absorption measurements by tunable laser diode absorption spectroscopy to deepen our understanding of selected chemical processes.
- Electrical measurements, completed by Langmuir probe measurements, to have access to ion fluxes, current densities, plasma potential, etc.
This information will be essential for the identification of possible reactions between the plasma species and for the understanding of their polymerization process. In addition, it will also allow us to propose reactions between the plasma species and the surface.
In a second step, the issue of the homogeneity of the plasma in terms of chemical composition will be addressed to achieve controlled spatial distributions of species inside the reactor. This analysis is essential, as changes in plasma composition affect the formation of nanostructures at different locations in the reactor.
This aspect will also be addressed temporally, since it is possible to work in pulsed mode. The modification of the activation time (ton) and the deactivation time (toff) of the discharge will enable the evaluation of the influence of this "temporal" variable. It is indeed well known that the variation of the duty cycle (ton ⁄ (ton + toff)) significantly modifies the chemical composition and properties of the synthesized plasma polymers.
The candidate must have a PhD and extensive theoretical and experimental knowledge in cold plasma characterization. He/she must have a solid background in plasma diagnostics by different methods and preferably by the presented methods (optical emission spectroscopy, TDLAS, FTIR, probes, etc.). A strong taste for scientific experimentation is expected. Strong communication skills are essential (oral, written, in French and English).
The Institut Jean Lamour (IJL) is a joint research unit of the CNRS (Institute of Chemistry) and the University of Lorraine, specialized in science and engineering of materials and processes. It has 4 research departments, 25 teams and about 500 people. The laboratory is located in Nancy (France), close to Germany, Belgium and Luxembourg and one and a half hours from Paris by TGV train.
This project is part of the ANR SPON-TO-CTRL program, which focuses on the understanding and engineering of the elementary processes of nanostructures formation by plasma polymerization. This aims to enable the initially random formation and growth of nanostructures to be oriented towards designed nanomodels. This ANR is supported by two laboratories: the IJL in Nancy and the IS2M in Mulhouse.
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