Chemiresistive Gas Sensors Based on Conducting Polymers

2017 ◽  
pp. 150-180 ◽  
Author(s):  
Sajad Pirsa
Keyword(s):  
Surface Modification ◽  
Gas Sensor ◽  
Conducting Polymer ◽  
Gas Sensors ◽  
Low Cost ◽  
Portable Devices ◽  
Response Mechanism ◽  
Fast Detection ◽  
Chemiresistive Gas Sensors ◽  
Change Response

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors.

Chemiresistive Gas Sensors Based on Conducting Polymers

2017 ◽  
pp. 543-574
Author(s):  
Sajad Pirsa
Keyword(s):  
Surface Modification ◽  
Gas Sensor ◽  
Conducting Polymer ◽  
Gas Sensors ◽  
Low Cost ◽  
Portable Devices ◽  
Response Mechanism ◽  
Fast Detection ◽  
Chemiresistive Gas Sensors ◽  
Change Response

Chemiresistive gas sensor based on conducting polymer is a type of sensors that presents gas sensors with excellent characters; low-cost fabrication, fast detection, simultaneous determination (array gas sensor), portable devices and so. Theses gas sensors are commonly based on polyaniline (PANI), polypyrrole (PPy), polythiophene (PTh) and their derivatives as a transducer. Common configuration and response mechanism of these sensors are reported in this section. Some factors that induce selectivity to these sensors are discussed. Different materials (conductor or insulant) can be used as a substrate of polymerization. Type of substrate, selective membranes, surface modification of conducting polymer and so can change response behavior of these sensors.

Using of SILD technology for surface modification of SnO2 films for gas sensor applications

2002 ◽  
Vol 750 ◽  
Author(s):  
G. Korotcenkov ◽  
V. Macsanov ◽  
Y. Boris ◽  
V. Brinzari ◽  
V. Tolstoy ◽  
...  
Keyword(s):  
Surface Modification ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Sensor Applications ◽  
Layer Deposition ◽  
Ag Clusters ◽  
Ag Deposition ◽  
Gas Response ◽  
Ionic Layer ◽  
Deposition Technology

ABSTRACTThe possibilities of SILD (successive ionic layer deposition) technology for modification of surface properties of nano-scaled SnO2 films for gas sensor applications were studied and are discussed in this article. Samples of SnO2 with thickness ranging from 30–40 nm were deposited by spray pyrolysis from SnCl4-water solutions. Nano-clusters of Pd and Ag, deposited by the SILD method were applied for surface modification. PdCl2 and AgNO3 were used as precursors for Pd and Ag deposition on the SnO2 surface.It was found that the method of surface modification by SILD can be used for improving both the sensitivity and the rate of gas response of SnO2-based gas sensors to CO and H2. At the same time, the presence of Pd and Ag clusters on the surface of SnO2 depresses the gas response to ozone.

Low-cost surface micromachined microhotplates for chemiresistive gas sensors

2018 ◽  
Vol 24 (8) ◽  
pp. 3291-3297 ◽  
Author(s):  
K. G. Girija ◽  
S. Chakraborty ◽  
M. Menaka ◽  
R. K. Vatsa ◽  
Anita Topkar
Keyword(s):  
Gas Sensors ◽  
Low Cost ◽  
Cost Surface ◽  
Chemiresistive Gas Sensors

Obtaining Highly Selective Responses from a Bulk Tin Oxide Gas Sensor

2013 ◽  
Vol 543 ◽  
pp. 239-242 ◽  
Author(s):  
Faramarz Hossein-Babaei ◽  
Amir Amini
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Tin Oxide ◽  
Low Cost ◽  
High Sensitivity ◽  
Thermal Capacity ◽  
Temperature Modulation ◽  
Custom Made ◽  
Metal Oxide Gas Sensors ◽  
Voltage Spike

Generic gas sensors are commonly used for the detection of different airborne contaminants due to their high sensitivity, long life and low cost, but they generally suffer from the variety of drifts and the lack of selectivity. Different techniques have been developed for selectivity enhancement in metal oxide gas sensors, among which operating temperature modulation is well known. It has been observed that sharp pallet temperature changes provide more analyte-related information. Due to the high thermal capacitance of the device, applying step voltage pulses to a bulk tin oxide gas sensor fails to provide step pallet temperature variations. On the other hand, the low thermal capacity of the custom made microheater gas sensors renders them vulnerable to all kinds of thermal noise and agitations. A novel technique is reported for temperature modulation, which facilitates sharp temperature rises of the gas sensitive pallets in generic gas sensors [. In this technique, a sharp heating voltage spike, considerably surpassing the nominal heating voltage, is applied prior to each heating voltage step. The thermal impact of these spikes is adjusted by controlling v2dt for obtaining the closest variations to the ideal temperature profile. Here, the advantages and effectiveness of the technique are demonstrated by differentiating among iso-butanol, tert-butanol, 1-butanol and 2-butanol contaminations in a wide concentration range in air using only a single generic tin oxide gas sensor.

scholarly journals Electrospray Printing of Graphene Layers for Chemiresistive Gas Sensors

2020 ◽  
Vol 2 (1) ◽  
pp. 66
Author(s):  
Sergio Masa ◽  
María José Mena ◽  
Esther Hontañón ◽  
Jesús Lozano ◽  
Siamak Eqtesadi ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Isopropyl Alcohol ◽  
Low Cost ◽  
Polymeric Substrate ◽  
Graphene Layers ◽  
Temperature Detection ◽  
Reduced Graphene ◽  
Stable Cone ◽  
Chemiresistive Gas Sensors

In this work, we investigate the electrospray technique for the preparation of graphene layers for use in chemiresistive gas sensors. A dispersion of reduced graphene oxide (rGO) in isopropyl alcohol (0.1 mg/mL) is electrosprayed and the rGO flakes are deposited onto a polymeric substrate with printed interdigitated electrodes. The surface area of the substrate covered with rGO is mainly determined by the distance between the needle and the substrate, while the rGO deposition pattern strongly depends on the flowrate and the applied voltage. Homogeneous layers of rGO are obtained in a stable cone-jet regime, and the room temperature detection behavior of the sensors towards NO2, O3 and CO is assessed. The sensors were not capable of detecting CO (up to 5 ppm), but they detected 0.2 ppm NO2 and 0.05 ppm O3. The results are encouraging regarding the use of electrospray for the production of low-cost and low-power gas sensors based on graphene for air quality applications.

scholarly journals A novel approach to a fully inkjet printed SnO2-based gas sensor on a flexible foil

2019 ◽  
Vol 7 (39) ◽  
pp. 12343-12353 ◽  
Author(s):  
Omar Kassem ◽  
Mohamed Saadaoui ◽  
Mathilde Rieu ◽  
Jean-Paul Viricelle
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Low Cost ◽  
Novel Approach

In recent years, printed and flexible gas sensors have quickly emerged as an innovative area of great interest because of their lightness and low cost.

Design and Development of the Stability Test System for Gas Sensor Array Based on ARM

2013 ◽  
Vol 798-799 ◽  
pp. 553-556
Author(s):  
Tao Zhou ◽  
Qing Zhou
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Sensor Array ◽  
Low Cost ◽  
Industrial Applications ◽  
Test System ◽  
Stability Test ◽  
Stability Parameters ◽  
Gas Sensor Array ◽  
The Stability

In order to eliminate or minimize the early instability of gas sensors, the aging process is needed. After aging,it is necessary to test stability parameters of gas sensors in a certain batch of the sensors for massive production. In this work, a system for the stability test of gas sensor array has been designed and developed both in hardware and software based ARM. Measurements demonstrate the quality and flexibility of it. It is low cost, excellent cost performance. The stability test system now works well in industrial applications and meets the need of industrial mass-production.

scholarly journals Advancements in Microfabricated Gas Sensors and Microanalytical Tools for the Sensitive and Selective Detection of Odors

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5478
Author(s):  
Enric Perarnau Ollé ◽  
Josep Farré-Lladós ◽  
Jasmina Casals-Terré
Keyword(s):  
Gas Sensors ◽  
Low Cost ◽  
Good Alternative ◽  
General Purpose ◽  
Portable Devices ◽  
Selective Detection ◽  
Implementation Techniques ◽  
Highly Sensitive ◽  
Working Principle ◽  
Odor Monitoring

In recent years, advancements in micromachining techniques and nanomaterials have enabled the fabrication of highly sensitive devices for the detection of odorous species. Recent efforts done in the miniaturization of gas sensors have contributed to obtain increasingly compact and portable devices. Besides, the implementation of new nanomaterials in the active layer of these devices is helping to optimize their performance and increase their sensitivity close to humans’ olfactory system. Nonetheless, a common concern of general-purpose gas sensors is their lack of selectivity towards multiple analytes. In recent years, advancements in microfabrication techniques and microfluidics have contributed to create new microanalytical tools, which represent a very good alternative to conventional analytical devices and sensor-array systems for the selective detection of odors. Hence, this paper presents a general overview of the recent advancements in microfabricated gas sensors and microanalytical devices for the sensitive and selective detection of volatile organic compounds (VOCs). The working principle of these devices, design requirements, implementation techniques, and the key parameters to optimize their performance are evaluated in this paper. The authors of this work intend to show the potential of combining both solutions in the creation of highly compact, low-cost, and easy-to-deploy platforms for odor monitoring.

scholarly journals Novel Miniature and Selective Combustion-Type CMOS Gas Sensor for Gas-Mixture Analysis—Part 1: Emphasis on Chemical Aspects

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 345 ◽  
Author(s):  
Dima Shlenkevitch ◽  
Sara Stolyarova ◽  
Tanya Blank ◽  
Igor Brouk ◽  
Yael Nemirovsky
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Low Cost ◽  
Gas Mixture ◽  
Catalytic Layer ◽  
Pt Nanoparticle ◽  
Wafer Level ◽  
Sensing Element ◽  
Deposition Techniques ◽  
Nanoparticle Catalyst

There is an ongoing effort to fabricate miniature, low cost, sensitive, and selective gas sensors for domestic and industrial uses. This paper presents a miniature combustion-type gas sensor (GMOS) based on a thermal sensor, where a micromachined CMOS–SOI transistor integrated with a catalytic reaction plate acts as a sensing element. This study emphasizes GMOS performance modeling, technological aspects, and sensing-selectivity issues. Two deposition techniques of a Pt catalytic layer suitable for wafer-level processing were compared, magnetron sputtering and nanoparticle inkjet printing. Both techniques have been useful for the fabrication of GMOS sensor, with good sensitivity to ethanol and acetone in the air. However, a printed Pt nanoparticle catalyst provides almost twice as much sensitivity as compared to that of the sputtered catalyst. Moreover, sensing selectivity in the ethanol/acetone gas mixture was demonstrated for the GMOS with a Pt nanoparticle catalyst. These advantages of GMOS allow for the fabrication of a low-cost gas sensor that requires a low power, and make it a promising technology for future smartphones, wearables, and Internet of Things (IoT) applications.

scholarly journals Application of an Array of Metal-Oxide Semiconductor Gas Sensors in an Assistant Personal Robot for Early Gas Leak Detection

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 1957 ◽  
Author(s):  
Jordi Palacín ◽  
David Martínez ◽  
Eduard Clotet ◽  
Tomàs Pallejà ◽  
Javier Burgués ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Mobile Robot ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Sensor Array ◽  
Low Cost ◽  
Gas Sensor Array ◽  
Gas Leak ◽  
Detection Capabilities ◽  
Personal Robot

This paper proposes the application of a low-cost gas sensor array in an assistant personal robot (APR) in order to extend the capabilities of the mobile robot as an early gas leak detector for safety purposes. The gas sensor array is composed of 16 low-cost metal-oxide (MOX) gas sensors, which are continuously in operation. The mobile robot was modified to keep the gas sensor array always switched on, even in the case of battery recharge. The gas sensor array provides 16 individual gas measurements and one output that is a cumulative summary of all measurements, used as an overall indicator of a gas concentration change. The results of preliminary experiments were used to train a partial least squares discriminant analysis (PLS-DA) classifier with air, ethanol, and acetone as output classes. Then, the mobile robot gas leak detection capabilities were experimentally evaluated in a public facility, by forcing the evaporation of (1) ethanol, (2) acetone, and (3) ethanol and acetone at different locations. The positive results obtained in different operation conditions over the course of one month confirmed the early detection capabilities of the proposed mobile system. For example, the APR was able to detect a gas leak produced inside a closed room from the external corridor due to small leakages under the door induced by the forced ventilation system of the building.

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