Etude des capteurs polymères sur support souple (détection des gaz, de la lumière et de la température)

AIX-MARSEILLE3-BU Sc.St Jérô (130552102) / SudocSudocFranceF

Comparison between MOX Sensors for Low VOCs Concentrations with Interfering Gases

International audienc

Trends in metal oxide thin films: Synthesis and applications of tin oxide

International audienc

Sensors for anaerobic hydrogen measurement: A comparative study between a resistive PdAu based sensor and a commercial thermal conductivity sensor

International audienceHydrogen sensors able to perform measurements in real time in anaerobic environment such as natural gas (NG) will greatly help the development of power to gas technology. For now, thermal conductivity (TC) gas sensors and Pd thin film based sensors have demonstrated their capability to measure H2 in air and N2 but there is still lack of testing in natural gas environment. In this study, the sensing performances (response, hysteresis, response time and selectivity) of two sensors were assessed in three anaerobic environments: N2, CH4, and NG. The first one is a homemade resistive sensor based on a PdAu thin film and the second one is a commercial thermal conductivity sensor. While most performances are equivalent for both technologies, only the PdAu sensor is able to detect selectively H2, without any interfering effect with NG components. Thus, Pd based thin film sensors are promising for H2 detection in anaerobic environments

PdAu Based Resistive Hydrogen Sensor in Anaerobic Environment

International audienceHydrogen is a promising gas for greenhouse gas emission reduction but also a reactive one. Thus, sensor for hydrogen detection in various atmospheres is mandatory. While leak sensors in air environments have been widely studied, only few researches have been done for hydrogen detection in anaerobic environments. In this work, the electrical resistance variation of a PdAu alloy as a sensitive film, is studied at various temperatures for hydrogen exposures in an anaerobic (N2) environment. The Pd0.8Au0.2 alloy was deposited on a Si/SiO2 substrate using magnetron sputtering followed by annealing at 200°C in N2. The sensor was then tested at various temperatures for 0.3% H2 exposure, the best operating temperature was found to be 50°C. Finally, sensor was able to detect at 50°C, concentrations from 0.3 to 3% H2. These preliminary results are promising for further development of hydrogen sensors in anaerobic environment

Ozone Gas Sensor Based on One-Dimensional V2O5/TiO2 Heterostructures

International audienc

Noise spectroscopy-based gas identifying methods to improve the selectivity of MOX gas sensors

Air quality monitoring and analysis have become a major issue in recent years. Metal oxide gas sensors are very sensitive due to high variability of its resistivity in presence of gas. However, they are not selective. It is not possible to determinate the both gas nature and concentration using sensors resistance variation. Noise spectroscopy is one of solution to improve the selectivity. In this paper, we apply the recent developed noise spectroscopy-based gas identifying methods in order to show the possibility of each method to discriminate the nature of different gases. Noise measurements have been carried out on metal-oxide gas micro-sensors with tungsten trioxide (WO3) sensing layer, under several NO2, O3 and CO concentrations in dry air. The obtained results have demonstrated that a selective sensing of the studied gases is possible using a single MOX gas micro-sensor

Ozone Gas Sensor Based on One-Dimensional V2O5/TiO2 Heterostructures

International audienc

Toward a Selective Detection of Ethanol by Perspiration

International audienc

SnO 2 Sensors For a Portable Transdermal Alcohol Detector Via Finger

In this work we report, for the first time, on the fabrication of portable transdermal alcohol detector device, based on lab made tin oxide (SnO 2 ) gas sensors. This method allowed us the continuous monitoring of alcohol in a non-invasive way with low cost and easy fabrication process. From the calibration results, the fabricated sensors exhibited high sensitivity, with fast detection and good stability, toward a wide range of ethanol concentrations. Additionally, they showed high immunity to elevate relative humidity percentages. Real time transdermal alcohol monitoring was performed on a volunteer. Twenty minutes after drinking 50 ml of tequila, the skin starts to emit alcohol and the sensor resistance begins to decrease. Alongside to this, breath alcohol measurements were simultaneously collected by using DRAGGER 6820 certified breathalyzer. The results revealed a consistent correspondence between the kinetics of blood, breath and perspiration, which validate the developed device reported in this work