Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity
Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work functi...
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doaj-653d8ce499af40ad8677878f0272cbe82021-09-25T23:54:17ZengMDPI AGChemosensors2227-90402021-09-01924424410.3390/chemosensors9090244Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of HumidityCristian E. Simion0Corneliu Ghica1Catalina G. Mihalcea2Daniela Ghica3Ionel Mercioniu4Simona Somacescu5Ovidiu G. Florea6Adelina Stanoiu7National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaNational Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, RomaniaPolycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration.https://www.mdpi.com/2227-9040/9/9/244thick films nickel oxideelectrical resistance and work function investigationsband-bending and electron affinity behaviorcarbon monoxide detection mechanism |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Cristian E. Simion Corneliu Ghica Catalina G. Mihalcea Daniela Ghica Ionel Mercioniu Simona Somacescu Ovidiu G. Florea Adelina Stanoiu |
spellingShingle |
Cristian E. Simion Corneliu Ghica Catalina G. Mihalcea Daniela Ghica Ionel Mercioniu Simona Somacescu Ovidiu G. Florea Adelina Stanoiu Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity Chemosensors thick films nickel oxide electrical resistance and work function investigations band-bending and electron affinity behavior carbon monoxide detection mechanism |
author_facet |
Cristian E. Simion Corneliu Ghica Catalina G. Mihalcea Daniela Ghica Ionel Mercioniu Simona Somacescu Ovidiu G. Florea Adelina Stanoiu |
author_sort |
Cristian E. Simion |
title |
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity |
title_short |
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity |
title_full |
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity |
title_fullStr |
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity |
title_full_unstemmed |
Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity |
title_sort |
insights about co gas-sensing mechanism with nio-based gas sensors—the influence of humidity |
publisher |
MDPI AG |
series |
Chemosensors |
issn |
2227-9040 |
publishDate |
2021-09-01 |
description |
Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration. |
topic |
thick films nickel oxide electrical resistance and work function investigations band-bending and electron affinity behavior carbon monoxide detection mechanism |
url |
https://www.mdpi.com/2227-9040/9/9/244 |
work_keys_str_mv |
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