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Reference : UMR5223-ANASER-001
Workplace : VILLEURBANNE,VILLEURBANNE
Date of publication : Thursday, October 15, 2020
Scientific Responsible name : Anatoli SERGHEI
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 11 January 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
The main goal of the current research proposal is to develop perfectly organized functional polymer nanotubes for applications in the field of high-performance radiation and particle detectors. The strategy of the project is based on employing highly-ordered nanoporous Anodized Aluminium Oxide (AAO) membranes (Fig. 1) as nano-templates to fabricate and characterize functional conductive polymer nanotubes. In the same time, these perfectly organized nanoporous membranes containing typically more than 1E9 nanotubes per cm2 and exhibiting a huge internal surface will be directly used to build-up, in collaboration with our Partner Laboratory IP2I (website: https://www.ip2i.in2p3.fr/), a practical demonstrator for a radiation and particle detector with an unprecedented performance in terms of time and spatial resolution. In order to achieve this goal, two main objectives will be followed: (1) fabricating and characterizing functional conductive polymer nanotubes in order to deeply understand their structure/properties/performance relationship; (2) using functional polymer nanotubes within AAO membranes to develop the prototype of a high-performance radiation and particle detector. The geometry of the nanoporous membranes, the morphology of the nanotubes and their electrical properties will be thus optimized in order to enhance the radiation and particles detection efficiency.
The expertise of preparing AAO membranes by a two-step electrochemical anodization process is available and fully functional at the IMP Laboratory. These membranes have been used in our laboratory as nano-templates to produce polymer nanorods, nanowires and nanotubes and also as measurement cells to investigate the electrical and dielectric properties of nanoconfined polymers. The conductive polymer nanotubes will be fabricated by solvent casting using tailor-made functionalized conjugated copolymers and they will be employed to act as nano-photocathodes. The layer thickness and the diameter of the polymer nanotubes will be adjusted by controlling the geometry of the nanopores and the concentration of the polymer solution used for solvent casting. The nanoporous geometry of the AAO membrane will give rise to an enormous enhancement in the effective area of the internal photocathode surface (i.e. at least five orders of magnitude), leading to a tremendous increase in the detection efficiency. A further aspect to be investigated will be related to orientation effects in nano-confinement: the coating process of the nanopores gives rise to orientation effects that could impact the conductivity along the long axis of the nanopores. A deep understanding of confinement effects on the conductivity of polymer nanotubes will represent thus a crucial point of the project.
IMP laboratory situated in one of the most famous scientific locations in France, gathers complementary skills: synthesis, structural characterization and physical-chemical properties, in the field of polymers and materials science. IMP laboratory has its own technical facilities and researchers can also easily access to a wide range of other specific tools and analytical devices. Each year IMP laboratory houses researchers from foreign countries and has frequent exchanges and many projects with local and international laboratories. The high scientific level of researchers and large scientific network makes IMP a powerful place in the field of polymers.
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