Gas Sensors

Tonezzer, Matteo; Duy, Lai Van

doi:10.1016/b978-0-12-822548-6.00113-8

Cited by 6 publications

(4 citation statements)

References 145 publications

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“…The sensor's response (S R ) value is quanti ed based on the current of the material in both ambient air and the target gas, expressed as ∆I/I = (I A -I G ) / I A if I A >I G for reducing gases and (I G -I A ) / I G if I G >I A for oxidizing gases, where I A is the current of the sensor in air, and I G is the current of the sensor in the presence of the target gas. Furthermore, Sensitivity (S), as the slope of the calibration curve, representing the sensor's ability to discern different concentrations, is measured by [S R (c+ h) -S R (c)] / h where S R is the sensor response to speci c concentration c and h denotes the difference between the two concentrations under comparison [14].…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Graphene, Nickel Oxide, Graphene Nickel Oxide, and Graphene Nickel Nanomaterials Using Horizontal Vapor Phase Growth Technique for Formaldehyde Gas Detection

Salvador,

Santos

2024

Preprint

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Toxic gases, such as formaldehyde, pose serious health risks and can lead to a range of illnesses, including cancer and damage to the nervous system. Formaldehyde is a common air pollutant found in indoor environments due to its release from various sources, such as building materials, furniture, and cleaning products. The development of gas sensors that can effectively detect and monitor formaldehyde levels is important to ensure the safety and well-being of individuals in these environments. Nickel Oxide, Graphene-Nickel Oxide, and Graphene-Nickel nanomaterials were synthesized using the Horizontal Vapor Phase Growth (HPVG) technique and fabricated as sensor substrates. The nanomaterials were characterized morphologically using Scanning Electron Microscopy (SEM) and underwent gold sputtering using the JEOL JFC-1200 Fine coater. Elemental composition analysis was conducted using Energy Dispersive X-ray (EDX). Chronoamperometry technique was employed for the electrical characterization, utilizing the Biologic SP-150 instrument. The sensors were exposed to various concentrations of formaldehyde, ranging from 0.95 ppm to 4.77 ppm. The current measurement of the gas sensors was recorded at different input voltages, ranging from 0.25 volts to 2 volts, both when exposed to air and the target gas. Results showed that the Graphene-Nickel sensor showed the highest sensing performance in both input voltages of 0.50V and 2V with sensor response of 420% and 84.64% respectively and in both concentrations gap from low and high with sensitivity of 52.63 and 131.7 respectively.

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Section: Methodsmentioning

confidence: 99%

Fabrication and Characterization of Graphene, Nickel Oxide, Graphene Nickel Oxide, and Graphene Nickel Nanomaterials Using Horizontal Vapor Phase Growth Technique for Formaldehyde Gas Detection

Salvador,

Santos

2024

Preprint

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“…One of the important parameters for gas sensors is the response and recovery time. The response time is the time required to reach 90% of the maximum response in the presence of gas [88]. The recovery time is defined as the time required for a sensor to return to 90% of the original baseline signal upon removal of the target gas [88].…”

Section: Gas-sensing Propertiesmentioning

confidence: 99%

“…The response time is the time required to reach 90% of the maximum response in the presence of gas [88]. The recovery time is defined as the time required for a sensor to return to 90% of the original baseline signal upon removal of the target gas [88]. The current responses at 400 ppm CO 2 gas concertation and 100 °C devices temperature was chosen to determine the response and recovery time of both devices.…”

Section: Gas-sensing Propertiesmentioning

confidence: 99%

Carbon nanowall-based gas sensors for carbon dioxide gas detection

Zhumadilov,

Yerlanuly,

Parkhomenko

et al. 2024

Nanotechnology

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Carbon nanowalls (CNWs) have attracted significant attention for gas sensing applications due to their exceptional material properties such as large specific surface area, electric conductivity, nano- and/or micro-porous structure, and high charge carrier mobility. In this work, CNW films were synthesized and used to fabricate gas sensors for carbon dioxide (CO2) gas sensing. The CNW films were synthesized using an ICP PECVD method and their structural and morphological properties were characterized using Raman spectroscopy and electron microscopy. The obtained CNW films were used to fabricate gas sensors employing interdigitated gold (Au) microelectrodes. The gas sensors were fabricated using both direct synthesis of CNW films on interdigitated Au microelectrodes on quartz and also transferring presynthesized CNW films onto interdigitated Au microelectrodes on glass. The CO2 gas-sensing properties of fabricated devices were investigated for different concentrations of CO2 gas and temperature-ranges. The sensitivities of fabricated devices were found to have a linear dependence on the concentration of CO2 gas and increase with temperature. It was revealed that devices in which CNW films have a maze-like structure perform better compared to the ones that have a petal-like structure. A sensitivity value of 1.18% was obtained at 500 ppm CO2 concentration and 100 °C device temperature. The CNW-based gas sensors have the potential for the development of easy-to-manufacture and efficient gas sensors for toxic gas monitoring.

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“…They are simple and easy to manufacture, have sufficient sensitivity, require less power, and are less affected by environmental factors such as temperature and pressure [37]. EC sensors have a short response time [37], which is defined as the time for a sensor to respond from the baseline signal to attain a certain percentage of its entire response after being exposed to the target gas [38]. It is usually in some literature the percentage is 90% of its entire response, and recovery time is the time required, after removal of target gas, to restore to 90% of the original baseline signal [39].…”

Section: Electrochemical Sensorsmentioning

confidence: 99%

Drive-by Air Pollution Sensing Systems: Challenges and Future Directions

Zarrar,

Dyo

2023

IEEE Sensors J.

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Air pollution has become a significant health, environmental and economic problem worldwide. The conventional approach of deploying fixed high-end air quality monitoring stations provides accurate measurements but can be expensive to deploy and maintain. As a result, the stations are typically deployed in a few strategic locations with various spatial interpolation or prediction models to estimate the air quality values from unsampled points. Recently, drive-by air quality sensing has emerged as a popular approach due to its dynamic nature, high spatial coverage, and low operational costs while providing highresolution data. At the same time, drive-by sensing has introduced a range of novel research challenges in terms of spatial and temporal coverage, mobile sensor calibration, and deployment strategies. This paper provides a systematic review and analysis of the recent work in this area, focusing on vehicular platforms, deployment strategies, primary challenges, and promising research directions.

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Gas Sensors

Cited by 6 publications

References 145 publications

Fabrication and Characterization of Graphene, Nickel Oxide, Graphene Nickel Oxide, and Graphene Nickel Nanomaterials Using Horizontal Vapor Phase Growth Technique for Formaldehyde Gas Detection

Fabrication and Characterization of Graphene, Nickel Oxide, Graphene Nickel Oxide, and Graphene Nickel Nanomaterials Using Horizontal Vapor Phase Growth Technique for Formaldehyde Gas Detection

Carbon nanowall-based gas sensors for carbon dioxide gas detection

Drive-by Air Pollution Sensing Systems: Challenges and Future Directions

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