The objective is to develop new sensitive layers based on oxide thin films that can be integrated into gas micro-sensors for outdoor air quality. Measurements will be carried out by electrical resistance variation as a function of the target gas content (NO₂). The detection properties of the sensitive layers vs. the target gas will be optimized by varying the preparation parameters and temperature cycles during sensing tests.

An important part of the work will consist in optimizing the conditions of preparation and the thermal cycles under gas of the sensitive layers. The elaboration conditions will be optimized in order to obtain nanostructured oxides. The multiplication of the number of grain boundaries and the high surface/volume ratio related to the nanostructuration are favorable to an increase in the response. The post-doc reasearcher will have at his/her disposal various means of elaboration (RF sputtering deposition), and analysis and characterization of structures (GXRD, Raman), microstructures (AFM, MEB and TEM microscopy, BET surface measurement) and electrical properties (4-point measurements, resistivity measurement under gas) of thin films.

 

Current electronic air pollution measurement systems use solid state gas sensors (resistive and electrochemical) and, for PM particles, optical sensors (absorption and dispersion of light). There is a need to develop better gas sensors with: increased sensitivity (ppb); better selectivity (without interference from other gases); shorter response time; a long life (several years); better stability and robustness (wide range of temperature conditions, humidity, air composition, comparison with reference tools and calibration); and lower energy consumption (mW). These new sensors will be integrated into platforms with the necessary electronics (sensor heating, signal conditioning, GPS and wireless communication).

Junior postdoc profile: Ph.D. in materials science or physics of materials with expertise in the elaboration of thin films by sputtering and their structural, microstructural, and electrical characterization. Less than 2 years of experience after the Ph.D. Experience in the study of thin layers for gas sensors will be preferred (especially MOx sensor knowledge and gas sensing experiments by using electrical measurements under controlled temperature and atmosphere).

We are looking for a dynamic person who has demonstrated his/her ability to carry out research work and write publications independently.

The application must be completed online on the Emploi-CNRS website: http://bit.ly/2ZJ7luT

For more information, contact: Lionel Presmanes (presmane@chimie.ups-tlse.fr)