Reference : UMR5005-FLODES-009
Nombre de Postes : 1
Workplace : ECULLY
Date of publication : Monday, January 23, 2023
Scientific Responsible name : Abdelkader SOUIFI
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 April 2023
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Fabrication and characterization of "ChemFETs" sensors for real-time water quality monitoring.Scientific field and context:
Monitoring water quality is now a major challenge for municipal drinking water networks as well as for agricultural and agri-food uses. Much research shows that chronic exposure to certain micro-pollutants, even at low concentrations, poses risks to human health and ecosystem functioning . These pollutants can enter the food chain through air, water and soil.
Keywords : water quality, pollutants, environment, electrochemical sensors, ChemFETsPhD project description:
The proposed PhD is part of the ANR SYSCO project «Integrated sensor systems in CMOS technology for measuring water quality». This project is being carried out as part of a collaboration between the Ampère and INL laboratories at INSA Lyon and the Ecole Centrale de Lyon and the LTM laboratory at CEA-Grenoble. The project is also in close partnership with STMicroelectronics, Crolles. The objective of the SYSCO project is to develop an analysis platform combining a multiplexed sensor system with a fluidic cell and a data acquisition and analysis system for real-time measurement of water quality.
In this context, the PhD project will focus more specifically on the design, fabrication and characterization of the "ChemFETs" sensors, which are the essential devices for the development of the multiplexed pollutants sensor platform-form. The main sources of water pollution are relatively well referenced in the literature. About 50% of water pollution is linked to agriculture. The work already initiated by the project partners has made it possible to choose some pollutants of interest for this thesis. For example, it will be possible to monitor in real time the concentrations of ammonium ions (NH4+) and nitrates (NO3-) which represent the majority of polluting ionic species as well as toxic ions of heavy metals (Pb2+). The proposed multiplexed detection system is based on the co-integration of several sensors specifically sensitive to the pollutants targeted for the study, as well as temperature and pH measurements.
The work will take place mainly at the Ampère and LTM laboratories for the fabrication and characterization of “ChemFETs” sensors. The sensor integration steps will be carried out at LTM and the studies and analyses of sensor properties will be carried out at Ampère Laboratory. Sample analyses will be provided by the Feyssine water treatment plant in Lyon-Villeurbanne.
Proposed research program and scientific approach:
• Year 1: Study of Ion Sensitive Membranes (ISM): ISM will be fabricated, studied and selected according to their selective detection properties but also their compatibility with CMOS integration processes by spin coating. Steps to functionalize ISM will be carried out by adding ionophores of interest on test structures. The properties of the IMSs embedded in the test structures will then be studied by electrochemical impedance measurements.
• Year 2: The sensitive membranes selected in year 1 will be integrated into "ChemFET" devices in CMOS technology (Ampere/LTM collaboration with STMicroelectronics).
• Year 3 : Calibrations of the "ChemFET" sensors for each pollutant. The study of the "ChemFET" responses will be carried out on samples provided by the Feyssine sewage treatment plant in Villeurbanne. Special attention will be paid to the selectivity of the sensors.
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