Nanoimprint process development on flexible substrate for electronic and optical applications
This subject aims to develop specific nanoimprint processes for various materials and to apply them to the realization of various components on plastic film. Several themes will be addressed through different materials, on the substrate itself or on a more or less thin layer deposited on a flexible plastic film. An incomplete list of these materials is presented below. They correspond to various potential applications. In the field of electronics, printing processes of dielectric materials will be studied. Particular substrates are also pressed for the creation of OTFT. In the field of optics, the structuring of several conducting polymers with special optical properties is considered for various applications. Some of these polymers belong to the family of PEDOT used also in the field of photovoltaics. The multilayer structure of polymers will be explored for the realization of 3D structures.
Finally, the ability to print polymer films loaded nanoparticles will also analyzed.
DEM’N’MELT Process : Optimisation of operating conditions by modelling
Within the framework of the PROVIDENCE project (Plan Relance, France), the DEM'N'MELT process was developed with the aim of marketing a solution for the treatment and conditioning of high and medium level waste to sites operators undergoing dismantling or remediation, in France and abroad. In this context, studies have been undertaken to optimise the operating conditions of the process.
The candidate will have to take in charge the software used in our Laboratory (Fluent, Workbench, SpaceClaim, Meshing), to appropriate the existing models. These models will have to evolve to :
o take into account additional measurements to calibrate the model
o study the sensitivity of the system to the physical properties of the glass
o optimise furnace operation and manage the feed capacity according to the filling level
o add agitation to the glass bath.
The candidate will be able to rely on the skills of the LDPV Laboratory, both experimentally and in modelling.
Detection of traces of narcotics in saliva by electrochemiluminescence on diamond electrodes
The consumption of narcotics is becoming a problem for road safety because 23% of road deaths in France occur in an accident involving at least one driver who tested positive. Thus, one objective of road safety in consultation with the concerned ministries (Ministry of Transport, Ministry of Interior, Ministry of Health and Ministry of Economy) is to improve the fight against road insecurity linked to narcotics consumption. In particular, this involves increasing and facilitating roadside checks using a portable device dedicated to controlling the use of narcotics on the roadside, similar to what is already done for breathalyzer tests. Such a device is not commercially available today. The main prerequisites of this device will be to provide reliable, immediate confirmation results with evidentiary value for the courts as well as a purchase cost compatible with large-scale deployment on French road networks. In this context, the subject of study proposed aims to study the possible detection of traces of narcotics in saliva using electroluminescence on a boron-doped diamond electrode. This method is considered promising for such an application because it potentially allows extremely low detection thresholds to be reached and, in accordance with legislative requirements, offers multiple possibilities aimed at achieving high selectivity towards chemical targets, with a high detection capacity. miniaturization of equipment and a relatively low cost of apparatus compared to analytical tools such as mass spectrometer, IMS, etc.
Kinetic study of biocide effect in nanocellulose_based food film
This project will study the kinetic of biocide effect of a nanocellulose-based film food. The main aim is to graft Ag and/or ZnO NPs on and inside halloysite particles that have a characteristic shape of twisted sheets and therefore could acting as NPs tanks. The localization of NPs outside halloysite could induce a fast biocide effect with limited duration whereas the internal grafting could produce longer biocide effect. This project gathers all steps from the film food synthesis, its nanocharacterization to the evaluation of its toxicological effect on bacteria. The final goal is to find one or many halloysite functionalizations allowing to extend the biocide effect in film food and to transpose it to other types of materials.
Silicon nanowire elaboration for microelectronic applications
In order to realize high capacity integrated capacitor, one approach consists in developing electrode with high specific surface. In this work, we propose to perform capacitor integrating silicon nanowires. The first part of this study will be devoted to the understanding and to the optimization of Si nanowires CVD growth process. In parallel, properties of nanowires obtained by electrochemical silicon etching will be assessed and will be compared to CVD nanowires characteristics. According to the electrical performances, different strategies (metallization Silicuration…) will be envisaged in order to enhance their electrical conductivity.
Characterisation of vanadium alloys
Vanadium alloys, investigated in the scope of application in fusion reactors, are potential candidates for fuel cladding of future sodium cooled or gas cooled fasts reactors. Then, in 2009, CEA launched a program aiming to assess this solution according to future reactor requirements.
Preliminary investigation of V-4Cr-4Ti plates was done at DMN/SRMA/LA2M (i) on a reference Japanese grade and (ii) on a specific grade fabricated for CEA study. Works haw focuses on recrystallisation structure after cold working (grain size and morphology, effect of annealing temperature), and on fine microstructure (occurrence of Ti(O,C,N) precipitation). In 2011, fabrication of vanadium tube by hot extrusion is planned to be relevant of the final cladding geometry. The proposed post-doc investigation aims to monitor the fabrication and to specify the impact of fabrication process on microstructure, recrystallisation dynamic and mechanical properties.