Search results for: K. Aguir

Items from 1 to 20 out of 52 results

article

Structural and NH3 gas-sensing properties of La0.8Ca0.1Pb0.1Fe1-xCoxO3 (0.00 ≤ x ≤ 0.20) perovskite compounds

H. Saoudi, A. Benali, M. Bejar, E. Dhahri, more

Journal of Alloys and Compounds > 2018 > 731 > C > 655-661

The perovskite La_0.8Ca_0.1Pb_0.1Fe_1-xCo_xO₃ (x = 0.00, 0.05, 0.10, 0.15 and 0.20) compounds were synthesized by the sol-gel method using the citric acid route. Structural, morphological, electrical and gas-sensing properties of these compounds were investigated by various techniques, such as XRD, MEB and electric resistance measurements (from 30 to 350 °C). These compounds were found to exhibit a single...

chapter

Highly sensitive WO₃ thin films integrated on microsensor platforms for ppb BTEX detection in a gas mixture with high rate of humidity

A. Favard, T. Contaret, K. Aguir, A. Dumas, more

2017 IEEE SENSORS > 1 - 3

2017 IEEE SENSORS

The detection of air quality pollutants as BTEX gases under real conditions can be influenced by the humidity in the air and the presence of interfering gases. The humidity often limits the performances of gas sensors, particularly in terms of sensitivity. Using a sensitive layer of 50 nm of tungsten trioxide on a new micro hotplate transducer designed in our laboratory, very low BTEX concentrations...

article

A Novel High Linear CMOS Fully Integrated PA for the Design of Zigbee Transmitters

H. Thabet, S. Meillère, M. Masmoudi, J.-L. Seguin, more

BioNanoScience > 2017 > 7 > 3 > 475-484

This paper describes a 863–870-MHz transmitter for wireless sensor applications. The fully integrated designed circuit is based on AMS 0.35-μm CMOS standard technology. The transmitter presented is composed by four stages: quadrature voltage-controlled ring oscillator (QVCO) controlled by a voltage (V_CTRL), two passive switch mixers, two combiners (a substractor and an adder), and a novel high linear...

article

Design of new low-noise and low-power CMOS differential pair

J. Nebhen, S. Meillère, M. Masmoudi, J-L. Seguin, more

Electronics Letters > 2015 > 51 > 18 > 1433 - 1435

A novel structure of a CMOS differential pair is presented, which is suitable for low supply voltages and low power consumption as well as a much higher gain than that of a conventional differential pair. This structure is based on the new technique of composite transistors. The need for the design of integrated circuits at low voltage, with low power consumption and how this constraint is reflected...

chapter

Contribution to the Study of the Dielectric Properties of WO₃ Thin Films: Effect of Oxygen Adsorption

M. Hannachi, W. Belkacem, M. Othman, F. Jomni, more

TMS2015 Supplemental Proceedings > 2015 Functional Nanomaterials: Energy and Sensing > 373 - 377

This chapter contains sections titled: Introduction Experimental Details Results and Discussion Conclusion

chapter

Noise analysis of metal-oxide gas microsensors response to a mixture of NO₂ and CO

T. Contaret, J.-L. Seguin, K. Aguir

IEEE SENSORS 2014 Proceedings > 285 - 288

2014 IEEE Sensors

The noise level often limits the performances of gas sensors, particularly in terms of sensitivity. However, it can also be an effective detection tool. Indeed, noise spectroscopy is one of the solutions to enhance the selectivity and sensitivity of metal oxide sensors. This experimental technique is based on analysis of the power spectral density of noise fluctuations measured at the terminals of...

article

Synthesis of pure Cu2O thin layers controlled by in-situ conductivity measurements

A. Labidi, H. Ouali, A. Bejaoui, T. Wood, more

Ceramics International > 2014 > 40 > 6 > 7851-7856

An easy synthesis route for cuprous oxide (Cu ₂ O) nanoparticles is reported via thermal annealing improved and controlled by in-situ conductivity measurements. The crystalline structure, phase transition, surface morphology and particle size/shape, were investigated through X-ray diffraction, a conductivity setup and scanning electron microscopy, respectively. X-ray diffraction patterns revealed...

article

Ammonia detection by a novel Pyrex microsystem based on thermal creep phenomenon

V. Martini-Laithier, I. Graur, S. Bernardini, K. Aguir, more

Sensors and Actuators B: Chemical > 2014 > 192 > C > 714-719

Our research work aims to develop a microfluidic system for gas analysis by using an original principle of integrated pumping. This microsystem can detect ammonia and the gas flow parameters inside the channel can be also controlled. The proposed microdevice consists in a microchannel including an integrated gas sensor with a heater. The trioxide tungsten (WO₃) is implemented as a sensitive layer...

article

Theoretical and experimental study of the response of CuO gas sensor under ozone

A. Bejaoui, J. Guerin, J.A. Zapien, K. Aguir

Sensors & Actuators: B. Chemical > 2014 > 190 > Complete > 8-15

In this paper, we assumed that the ozone detection mechanism of p-type semiconductor resistive gas sensors in dry air is essentially due to adsorption of species O ₂ , O ₂ ⁻ , O and O ⁻ at the surface of the grains.Based on the Wolkenstein adsorption theory, a dynamic model was formulated taking into account the chemical interactions between the sensor and chemisorbed species...

chapter

Tuning the bias sensing layer: A new way to greatly improve Metal-Oxide gas sensors selectivity

N. Dufour, A. Chapelle, C. Talhi, F. Blanc, more

2013 Seventh International Conference on Sensing Technology (ICST) > 11 - 15

2013 Seventh International Conference on Sensing Technology (ICST)

The effects of bias current in the sensing layer of resistive Metal-Oxide (MOX) sensors toward gases have been investigated. The behavior of a WO₃ thin film deposited by sputtering has been studied. In a first time, while the working temperature is kept constant, it has been found that tuning the polarization of the MOX layer induces changes on its sensitivity. Besides, the behavior of sensitivity...

chapter

Response enhancement of WO₃ gas sensors by metallic nanograins

M. Othman, D. Lollman, K. Aguir, P. Menini, more

2013 IEEE SENSORS > 1 - 4

2013 IEEE Sensors

In the present work, we have studied the effect of metal nanoparticles on the enhancement of the sensor response. These nanoparticles were deposited on the surface of WO₃ sensors.

chapter

Adsorption-desorption noise as a selective detection tool for metal-oxide gas microsensors

T. Contaret, J.-L. Seguin, K. Aguir, P. Menini

2013 22nd International Conference on Noise and Fluctuations (ICNF) > 1 - 4

2013 International Conference on Noise and Fluctuations (ICNF)

The aim of the paper is to evaluate the adequacy of noise spectroscopy to significantly improve the selectivity of microsensors compared to a conventional acquisition of the sensor resistance variation. Significant results of low frequency noise characterization of metal-oxide gas microsensors with WO₃ sensitive thin film are presented. Using developed measurement system, noise spectra show a clear...

article

Modeling of a p-type resistive gas sensor in the presence of a reducing gas

A. Bejaoui, J. Guerin, K. Aguir

Sensors & Actuators: B. Chemical > 2013 > 181 > Complete > 340-347

The detection mechanism in gas sensors based on semiconductor materials is mainly due to charge-transfer. The interaction between the semiconductor surface and the gas is approached by the theory of chemisorption. Based on the Wolkenstein adsorption model, we propose a model simulating the reaction between the ionized oxygen species adsorbed at the surface of a p-type semiconductor with a reducing...

chapter

Increasing the sensitivity and selectivity of Metal Oxide gas sensors by controlling the sensitive layer polarization

N. Dufour, Y. Veyrac, P. Menini, F. Blanc, more

2012 IEEE Sensors > 1 - 4

2012 IEEE Sensors

The effects of bias current on sensitivity and selectivity of resistive Metal-Oxide (MOX) sensors toward gases have been investigated. While the working temperature is kept constant, it has been found that tuning the polarization of the MOX thin film induces changes on its sensitivity toward gases. Besides, the behavior of sensitivity versus bias current depends on the nature of the gas and of the...

article

Microfluidic gas sensor with integrated pumping system

V. Martini, S. Bernardini, M. Bendahan, K. Aguir, more

Sensors & Actuators: B. Chemical > 2012 > 170 > Complete > 45-50

In this study a gas detection microfluidic system with a gas integrated pumping by thermal creep was realized. First, microfluidic and thermal simulations were done to determine the microsystem dimensions. Heat distribution in all microsystem was then simulated using Comsol Multiphysics software. These results allowed us the best material choices suited for our application. The microsystem includes...

chapter

Physical-based characterization of low frequency responses in metal-oxide gas sensors

T. Contaret, J.-L. Seguin, K. Aguir

2011 IEEE SENSORS Proceedings > 141 - 144

2011 IEEE Sensors

The noise level in the gas microsensors is a tool for characterizing the electrical conduction under various gases and a means to improve selectivity. Metal-oxide gas microsensors with WO₃ sensitive thin film have been characterized using a low frequency noise technique. The spectral form of the noise responses measured using our specific systems is similar for tested gases (ozone and nitrogen dioxide)...

article

A New Active Organic Component for Flexible Ammonia Gas Sensors

T. Fiorido, S. Bernardini, M. Bendahan, K. Aguir, more

Procedia Engineering > 2011 > 25 > Complete > 1069-1072

The objective of this study was to realize flexible gas sensors using low cost solution processing such as drop casting. As active sensor material, a p-type organic semiconductor, αα-ωω-hexyl-distyrylbithiophene (DH-DS2T), was used. DH-DS2T based transistors exhibit high mobility together with a good air stability. As a chemical compound, DH- DS2T presents a good solubility in common organic solvent,...

article

A Physics-Based Noise Model for Metallic Oxide Gas Sensors Characterization

T. Contaret, T. Florido, J.-L. Seguin, K. Aguir

Procedia Engineering > 2011 > 25 > Complete > 375-378

In this contribution, we show new results of low frequencies noise characterization of metal oxide gas microsensors with WO ₃ sensitive thin film. The spectral form of the measured noise responses using our specific systems is similar for tested gases (ozone and nitrogen dioxide). We observe a clear lorentzian behavior according to adsorption-desorption noise theory. To identify the detected...

article

Low-noise micro-power chopper amplifier for MEMS gas sensor

J. Nebhen, S. Meillere, M. Masmoudi, J.-L. Seguin, more

International Journal of Microelectronics and Computer Science > 2011 > Vol. 2, nr 4 > 146-155

In this paper, a low-noise, low-power and low voltage Chopper Stabilized CMOS Amplifier (CHS-A) is presented and simulated using transistor model parameters of the AMS 0.35 μm CMOS process. This CHS-A is dedicated to high resistive gas sensor detection. The proposed CHS-A using Chopper Stabilization technique (CHS) exhibits an equivalent input referred noise of only 0.194 nV/√Hz for a chopping frequency...

article

All solution processed flexible ammonia gas and light sensors based on α,ω-hexyl-distyrylbithiophene films

T. Fiorido, M. Bendahan, K. Aguir, S. Bernardini, more

Sensors & Actuators: B. Chemical > 2010 > 151 > 1 > 77-82

The aim of this study is to realize flexible photo- and gas sensors using low cost solution processing such as drop casting or ink jet printing. Two organic semiconductors, namely distyrylbithiophene (DS2T) and α,ω-hexyl-distyrylbithiophene (DH-DS2T), were used as active sensor materials. Both oligomers are p-type semiconductors with high mobility and good air stability. While DS2T has a poor solubility...

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INFONA - science communication portal

Search results for: K. Aguir

Structural and NH3 gas-sensing properties of La0.8Ca0.1Pb0.1Fe1-xCoxO3 (0.00 ≤ x ≤ 0.20) perovskite compounds

Highly sensitive WO₃ thin films integrated on microsensor platforms for ppb BTEX detection in a gas mixture with high rate of humidity

A Novel High Linear CMOS Fully Integrated PA for the Design of Zigbee Transmitters

Design of new low-noise and low-power CMOS differential pair

Contribution to the Study of the Dielectric Properties of WO₃ Thin Films: Effect of Oxygen Adsorption

Noise analysis of metal-oxide gas microsensors response to a mixture of NO₂ and CO

Synthesis of pure Cu2O thin layers controlled by in-situ conductivity measurements

Ammonia detection by a novel Pyrex microsystem based on thermal creep phenomenon

Theoretical and experimental study of the response of CuO gas sensor under ozone

Tuning the bias sensing layer: A new way to greatly improve Metal-Oxide gas sensors selectivity

Response enhancement of WO₃ gas sensors by metallic nanograins

Adsorption-desorption noise as a selective detection tool for metal-oxide gas microsensors

Modeling of a p-type resistive gas sensor in the presence of a reducing gas

Increasing the sensitivity and selectivity of Metal Oxide gas sensors by controlling the sensitive layer polarization

Microfluidic gas sensor with integrated pumping system

Physical-based characterization of low frequency responses in metal-oxide gas sensors

A New Active Organic Component for Flexible Ammonia Gas Sensors

A Physics-Based Noise Model for Metallic Oxide Gas Sensors Characterization

Low-noise micro-power chopper amplifier for MEMS gas sensor

All solution processed flexible ammonia gas and light sensors based on α,ω-hexyl-distyrylbithiophene films

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