General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0844
Thesis topic details
Category
Technological challenges
Thesis topics
Ultrasensitive static/dynamic flexible force transducer
Contract
Thèse
Job description
In this thesis, the principles and challenges in the development by printing and characterisation of conformable organic piezoelectric matrices for medical use under stress will be examined. A stretchable/conformable piezoelectric sensor, produced on a stretchable substrate, will be developed with materials (PVDF-TrFE type polymer or composite). These developments will make it possible to study the feasibility of using such piezoelectric components in various fields.
The aim of the study carried out to date has been to produce a flexible piezoelectric device based on the principle of a double-sided sensor so as to eliminate the contribution of bending. This sensor must also be stiff enough to be deployed through a 3mm diameter catheter. In this context, the work carried out in this thesis will focus on the development of a flexible piezoelectric sensor capable of converting the mechanical energy of low stresses, coupled with a piezoresistive sensor capable of measuring static stresses. The use of polymers offers greater flexibility, and they are implemented in the form of thin films, making them lightweight and space-saving. In order to achieve these objectives, a dedicated sensor structure guaranteeing redundant measurement (piezoelectric and piezoresistive sensor) will be studied, produced and characterised. The sensor manufacturing process will have to be optimised to increase their efficiency. Optimisation of the architecture of the electrodes and the geometry of the active layers will be tested on a test bench in order to assess their ability to measure static and dynamic stresses simultaneously over the widest possible range of forces. At the same time, fundamental characterisations of the material will be carried out in order to establish correlations between the structure and electrical properties of the sensors.
University / doctoral school
Mécanique, Energétique, Génie civil, Acoustique (MEGA)
Université de Lyon
Thesis topic location
Site
Grenoble
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
BENWADIH Mohammed mohammed.benwadih@cea.fr
CEA
DES/DTNM//LCO
17 Rue des Martyrs,
Grenoble
04.38.78.28.36
Tutor / Responsible thesis director
COTTINET PIERRE-JEAN ierre-jean.cottinet@insa-lyon.fr
INSA
LGEF
INSA Lyon - LGEF
Bâtiment Gustave Ferrié - 8 rue de la Physique (3e étage)
69621
Villeurbanne cedex
tél : + 33 (0)4 72 43 79 53
courriel : lgef@insa-lyon.fr
04 72 43 64 03
En savoir plus