Posts tagged "air intérieur"

Embedded Multi Gas Sensors for Indoor Air Quality Monitoring

Context Presentation

The measurement of indoor air quality is important for health protection against chemical and gaseous pollutants ... The indoor air can contain many pollutants such as CO, CO2, NO2 and VOCs. These pollutants exist in different materials and products that can be used in housing (furniture, cleaners ...), but can be also coming from human activities or outside source. In this case, the detection, measurement and monitoring of these gazeuse contaminants is necessary.

In view of its high performance and low cost, the innovative gas multi-sensor based on metal oxides semiconductors for analyzing and controlling indoor air quality is a good alternative to electrochemical and infrared sensors. This project is currently in progress in LAAS in collaboration with the LCC and Laplace and as part of a thesis funded by neOCampus and the Occitanie region.

This thesis focuses on the characterization of multiple MOX-based gas sensors and integrates these multi-sensors in electronic card to achieve a connected object to control the indoor air quality in offices and classrooms in University Paul Sabatier in Toulouse. The gas multi-sensor is a microsystem composed by four sensors on a microchip, realized to detect target gases.  



Multi-sensors, MOS, Indoor Air Quality, Smart Building, neOCampus

Scientific goals

•    To characterize new nanomaterials (SnO2, CuO, ZnO, WO3 ...) designed by the LCC by using an experimental set-up,

•    To define an operating protocol by trying different operating modes.


Sensors and Photocatalytic Coatings for Indoor Air Quality: Detection and Degradation of Pollutants

Context Presentation

We spend around 85% of our time indoors. However, indoor air is 5 to 10 times more polluted than outside air. Based on this observation, various laboratories at the Paul Sabatier - Toulouse III University are focusing part of their research on the development of tools for measuring and improving the Indoor Air Quality.

This is the case of LAAS (Systems Architecture Laboratory), LCC (Coordination Chemistry Laboratory) and LMDC (Materials and Construction Durability Laboratory), which work in collaboration on the development and optimization of MOx gaz sensor (semiconductor metal oxides) to detect different gases in the air (LAAS and LCC), and photocatalytic coatings (LMDC and LCC) to degrade or decrease the concentration of gaseous pollutants.

During this internship, the gases mainly treated are nitrogen oxides (NOx). The aim is to assess the effectiveness of the sensors developed by LAAS and the LCC in detecting variations of NOx concentration and the effectiveness of the coatings in degrading them.

 Image_NeoCampus - Mathieu Delaveau


neOCampus, Indoor Air Quality, Sensors, Photocatalysis, Nitrogen Oxides, Metal Oxides Semiconductor

Scientific goals

•    To integrate the LAAS / LCC gas sensors into the LMDC test device (Figure 1).

•    To compare the detection capacity of the NOx sensors and analyzer currently present at the LMDC.

•    To carry out abatement tests to test the depollution efficiency of various photocatalytic coatings, in particular based on ZnO and TiO2, and compare the results obtained with the two measurement systems (analyzer and sensors).


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