Love wave gas sensor based on DWNTs sensitive material

International audienceThis work focuses on the application related to the detection of low moisture and environmental pollutants. A novel gas sensor with inkjet printed Double Walled Carbon Nano Tubes (DWNTs) on a Love wave sensor platform was developed for Volatile Organic Compounds (VOCs) and humidity detection application. The experiments were conducted in real-time at ambient conditions. Results demonstrate the adsorption of vapor compounds on DWNTs sensitive material and leads for example to frequency shifts of 1.97 kHz and 2.93 kHz with 120 ppm of ethanol vapor and 6.22 % RH, respectively

An analytical approach to predict maximal sensitivity of microring resonators for absorption spectroscopy

International audienceThe different biosensing strategies with microring resonators consist in quantifying the resonance shift under thepresence of biological or chemical agents. These strategies lead to the measurement of a wavelength shift or an output power variation correlated to the analyte concentration. The design guidelines to enhance the sensitivity have been already studied and reviewed over the past decade. However, very few studies have been published addressing ring resonator performance used as absorption micro-spectrometer, which can be explored with colorimetric chemistry and microfluidic handling. In this work, a sensitivity model for the operation of absorptive based ring resonators is presented. Such a model is proposed to provide a guideline to optimize ring resonator design and parameters. Finally, 2.5 FDTD simulations of different ring geometries are presented and compared to the results obtained with the model

SH-SAW VOCs sensor based on ink-jet printed MWNTs / polymer nanocomposite films

International audienceThis study presents Shear Horizontal Surface Acoustic Wave (SH-SAW) sensor based on ink-jet printed poly (3,4-ethylenedioxythiophene) polystyrene sulfonate – multi wall carbon nanotubes (PEDOT:PSS-MWCNTs) and MWNTs-based inks as sensitive gas material. Experiments show the validation of fabrication process of acoustic platform and ink-jet printed sensitive layers. The characterization of two devices under different concentrations of ethanol vapor shows promising results in terms of reproducibility of the measurements. A sensitivity of 12Hz/ppm was recorded with the sensor based on ink-jet printed 600nm thickness sensitive layer

SH-SAW VOCs sensor based on ink-jet printed MWNTs / polymer nanocomposite films

International audienceThis study presents Shear Horizontal Surface Acoustic Wave (SH-SAW) sensor based on ink-jet printed poly (3,4-ethylenedioxythiophene) polystyrene sulfonate – multi wall carbon nanotubes (PEDOT:PSS-MWCNTs) and MWNTs-based inks as sensitive gas material. Experiments show the validation of fabrication process of acoustic platform and ink-jet printed sensitive layers. The characterization of two devices under different concentrations of ethanol vapor shows promising results in terms of reproducibility of the measurements. A sensitivity of 12Hz/ppm was recorded with the sensor based on ink-jet printed 600nm thickness sensitive layer

Invited talk: CArbon and Microwave-based Ultrasensitive gas Sensors (CAMUS)

International audienceIn the areas of safety, health and environment, the detection of chemical compounds, VOCs and toxic gases, is a major societal concern. The explosion in recent years in the telecommunications market has led to the emergence of concept of sensor network. This new concept of communicating objects meets the growing need to deploy sensors for monitoring and analysing distributed applications. These systems rely on an architecture built around wireless autonomous sensors composed of nanostructured materials that are very effective in terms of sorption of chemical compounds, and of new low cost communication electronic devices printed on flexible substrates. Thus, the research effort requires a multidisciplinary approach around the engineering of new materials, transduction mechanisms and electromagnetic waves (microwaves).The CAMUS (CArbon & Microwaves-based Ultrasensitive Gas Sensors) project is proposed by a consortium of four labs with complementary skills: IMS Bordeaux UMR 5218, XLIM Limoges UMR 7252, IEMN Lille UMR 8510, CINTRA Singapore UMI 3288 CNRS-NTU-Thales.In this project, we propose the realization of a platform for microwave transduction associated with nanostructured materials, graphene and carbon nanotubes (CNTs), allowing the extraction of interference properties of conductivity and dielectric permittivity caused by the interaction of these materials with the target species. Thus, our approach aims to demonstrate the feasibility of a passive microwave resonator on a flexible substrate dedicated to the detection of chemical compounds in the vapor state

Capacitive microwave sensor for toxic vapor detection in an atmospheric environment

Présenté à IEEE Sensors, Oct 2017, Glasgow, United Kingdom ⟨10.1109/ICSENS.2017.8234281⟩This paper presents an inkjet printing capacitive microwave sensor for toxic vapor detection. The designed sensors were presented and fabricated with success. The experiments show sensitivity to ethanol vapor according to the S parameters. It is equal to 0.9 kHz/ppm and 1.3 kHz/ppm for the sensors based on 5 and 50 sensitive layers respectively. This sensor will be integrated into real-time multi-sensing platforms adaptable for the Internet of Things (IoT)

Conception d’un capteur de gaz à transduction électromagnétique à base de nanostructures carbonées sur substrat flexible

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