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Reference : UMR3685-MARMAY-002
Workplace : GIF SUR YVETTE
Date of publication : Friday, June 26, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 2 November 2020
Proportion of work : Full time
Remuneration : Between 2800 and 2900 € gross monthly
Desired level of education : PhD
Experience required : 1 to 4 years
The 12-month post-doctoral position is open to M/F candidates motivated by nanosciences, and in particular by the synthesis of carbonaceous nanostructures in the gas phase. The candidate will also have a strong interest in instrumental development as well as in transmission electron microscopy.
The missions of this position relate to both instrumental and experimental development to allow the growth of aligned nanotubes under conditions compatible with the environment of a transmission electron microscope (TEM). The ultimate goal is to study in-situ in a MET the formation of aligned nanotubes using CVD at low temperature. Vertically aligned carbon nanotube mats (VACNT) are materials with attractive properties for many applications. A method of choice and industrially transferred for the synthesis of high quality VACNT is chemical vapor deposition assisted by an aerosol (AACCVD). This one-step method has recently been adjusted to growth on aluminum, which requires relatively low temperatures, of the order of 600 ° C. In this context, the main objective is to deepen our understanding of the growth of VACNTs specifically at low temperature and to identify the mechanisms involved so as to achieve better control of the synthesis process operated at low temperature. For this, the in situ study, allowing to follow the formation of nanotubes and to understand their growth mechanisms, is very important. This study will be carried out on a local scale using an electron microscope in environmental transmission (E-TEM NANOMAX from the Equipex TEMPOS). The candidate will carry out different developments, both technical and experimental, on the CVD synthesis device of the laboratory, and then he/she will be in charge of a proof of concept inside a gas phase growth whose environment is similar to that of an environmental TEM.
The work will be carried out in collaboration with C2N. It consists, firstly, in adjusting the experimental configurations and conditions of synthesis of CNTs with regard to the constraints imposed by the E-TEM environment so as to demonstrate the feasibility of growth under these conditions. One of the challenges is to demonstrate the feasibility of growth in a single step by aerosol CVD at very low pressures (<1mbar) and with a supply of carbonaceous and catalytic precursor compatible with an implementation of the process in a TEM. The environment of the laboratory CVD reactors will be modified, and specific tests will be used to carry out the experimental studies before the implementation on E-TEM and the first observations. The long term approach envisaged is indeed the implementation of our AACCVD process on the microscope to study in situ the formation of nanotubes at low temperature by implementing a CVD method as a single step process, which, to our knowledge, has never been done.
The candidate must have a PhD in chemistry, materials science or possibly engineering process. Solid experience in the synthesis of nanomaterials in the gas phase, preferably carbon nanotubes, is particularly appreciated. Experience in transmission electron microscopy is highly recommended. Experience in terms of instrumental development will also be welcome.
The research will mainly be carried out within the UMR NIMBE based at CEA Saclay and also at the Center for Nanosciences and Nanotechnologies (C2N) within the framework of the collaboration.
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